The directions of the vectors for velocity and acceleration will be [b] the velocity vector points to the right and the acceleration vector points to the left.
How to explain the velocity?The velocity vector is always pointing in the direction that the object is moving. Therefore, from our vantage point, the direction of velocity is to the right.
When an object experiences positive acceleration, the acceleration vector points in the object's motion direction.
When an object experiences a negative acceleration, the acceleration vector is in the opposite direction as the object's velocity. Therefore, from our vantage point, the direction of velocity is to the left.
The rate at which an object's position changes is called its velocity vector. The rate at which an object's velocity changes is called its acceleration vector.
As a result, the vectors for acceleration and velocity point in opposite directions.
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A train slows down as it pulls into a station, if the train is moving from your left to your right, what are the directions of the vectors for velocity and acceleration?
[a] the velocity points to the left and the acceleration vector also points to the left
[b] the velocity vector points to the right and the acceleration vector points to the left
[c] the velocity vector points to the left and the acceleration vector points to the right
[d] the velocity vector points to the right and the acceleration vector also points to the right
pls help me!! 100 points!!!
"type a definition for each of the following words in YOUR own words."
1) Constants (also called Controls or Control Variables) –
2) Independent variable –
3) Dependent variable –
Answer:
1) Constants are variables that are kept the same throughout an experiment.
2) An independent variable is a variable that is manipulated by the experimenter.
3) A dependent variable is a variable that is measured by the experimenter.
Explanation:
find the velocity of a baseball thrown across a field a distance of 40 meters it takes the ball 4 seconds to cross the field
The velocity of a baseball thrown across a field is (V)= 10m/s
What is Velocity?Velocity of a particle is its speed and the direction in which it is moving.
It can also be described as the instantaneous rate of change of the particle's distance traveled.
How can we calculate the values of the velocity?To calculate the velocity we are using the formula here,
V= S/t
Here we are given,
S= a distance of a baseball thrown= 40m
t= time to travel the distance = 4 seconds.
Now we put the values in the above equation, we get
V= S/t
Or, V = 40/4
Or, V= 10m/s
So, from the above calculation we can conclude that, the velocity of a baseball thrown across a field is (V)= 10m/s
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Consider (a) an electron (b) a photon, and (c) a proton, all moving in vacuum. Choose all correct answers for each question. (i) Which of the three possess rest energy?
Electron and proton have rest energy which is option (a) and (c) .
An electron is a solid negatively charged factor of an atom. Electrons exist outdoor of and surrounding the atom nucleus. Each electron includes one unit of bad charge (1.602 x 10^-19 coulomb)A proton is a subatomic particle discovered with inside the nucleus of each atom. The particle has a advantageous electric charge, identical and contrary to that of the electron A photon is a subatomic particle, having strength and momentum however no mass or electric powered charge, this is the quantum unit of electromagnetic radiation, together with light.According to Einstein's quantum theory light propagates in the form of packets i.e. quanta of energy, which is called photon.
The rest mass of photons is being zero. So photos do not have rest energy they are never at rest .
As electrons and protons posses mass , therefore they have rest energy which is given by [tex]E=mc^2[/tex] .
Hence , only electron and proton have rest energy not photon.
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if i apply newton's 1st law of motion to football, the player carrying or running with the ball will stay running in the same direction unless
The player would continue in the same direction unless a force acts on the player.
What is the Newton's first law?The Newton's first law of motion states that an object will continue in its state of rest or uniform motion unless it is acted upon by an external force. This external force tries either make the object to move or to change its direction of motion accordingly.
Having said this, for a player that is running in the field with the ball, the player would continue in the same direction unless a force acts on the player such as when the player is pushed by another player.
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the sun is almost 400 times farther from earth than is the moon. how long does light from the moon take to reach earth?
About 1.3 seconds the light takes to reach from the moon to the earth.
How long does light from the moon take to reach earth?
We know that the closest object to our earth is the Moon. Its distance from the earth is about 240,000 miles, so light from the Moon takes 1 and 1/3 seconds to get from the Moon to Earth while on the other hand, sun is almost 400 times farther from earth as compared to the moon so the light reaches from sun is about 8 minutes 30 seconds.
So we can conclude that about 1.3 seconds the light takes to reach from the moon to the earth.
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a proton, a deuteron and an a-particle are moving with same momentum in a uniform magnetic field. find ratio of their time period
The ratio of their time period is 1 : 2 : 2.
The momentum of a proton, a deuteron, and an alpha particle is the same in a uniform magnetic field.
The charge of a proton is q = e and the let m(p) be the mass of the proton.
Let m(d) = 2m(p) be the mass of the deuteron and the charge of a deuteron is q =e.
Now, an alpha particle is made up of 4 protons. Therefore the mass of an alpha particle is 4m(p) and the charge on an alpha particle is q = 2e.
The formula for the time period of a moving particle in a uniform magnetic field is given as:
[tex]T = \frac2 \pi m}{qB}[/tex] where B is the magnetic field, m is the mass and q is the charge of the particle.
So, the time period of a proton is:
[tex]T_{1} = \frac{2 \pi m(p)}{eB}[/tex]
The time period of a deuteron is:
[tex]T_{2} = \frac{2 \pi (2m(p))}{eB}[/tex]
And the time period of an alpha particle is:
[tex]T_{3} = \frac{2 \pi ( 4m(p) )}{2eB}[/tex]
Therefore, the ratio is:
[tex]T_{1}: T_{2} : T_{3} =\frac{2 \pi m(p)}{eB} : \frac{2 \pi 2m(p)}{eB} : \frac{2 \pi (4m(p))}{2eB}[/tex]
T₁ : T₂ : T₃ = 1 : 2 : 2
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A coin is rolled in a straight line along a balcony edge at a steady speed of 0.46 m/s.
a) Calculate how far the coin rolls in 2.4 s.
b) Another coin is dropped from the balcony. It accelerates from rest and hits the ground after
8.0 seconds at a speed of 78.4 m/s. Calculate the acceleration of the coin during its fall
answer:
Use this equation (v=Δx/t); plug in velocity (0.500 m/s) and the time (2.4 s), then solve for displacement… (Δx=1.2 m)
If a coin is rolled in a straight line along a balcony edge at a steady speed of 0.46 m / s , then the distance traveled by this coin in 2.4 seconds would be 1.104 meters.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2×a×t²
v² - u² = 2×a×s
As given in the problem If a coin is rolled in a straight line along a balcony edge at a steady speed of 0.46 m / s ,
The distance traveled by the coin = 0.46 × 2.4
=1.104 meters per second
For another coin , by using the first equation of motion ,
v = u + a × t
78.8 = 0 + a × 8.0
a = 78.8 / 8.0
a = 9.85 m / s²
Thus, the distance traveled by this coin in 2.4 seconds would be 1.104 meters .
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A battery being tested has five cells testing normal and one cell showing very low. What action should be taken?
A. None, the battery is normal
B. Recharge the entire battery
C. Recharge only the cell that is very low
D. Replace the battery
The entire battery should be charged, as a battery being tested has five cells testing normal and one cell showing very low, so option B is correct.
What is Battery?A battery is a component that turns chemical energy into electrical energy and stores it. This process is called electrochemistry, and the structure that supports a battery is referred to as an electrochemical cell. One or more electrochemical cells can be used to create a battery, as in Volta's original pile. Two electrodes and an electrolyte are the main components of an electrochemical cell.
Some popular batteries are only intended for one usage (known as primary or disposable batteries). The electrons only travel in one direction from the anode to the cathode. Either the buildup of reaction products on the electrodes prevents the reaction from continuing, or their electrodes get depleted as they release their positive or negative ions into the electrolyte, and it is finished. The battery is eventually disposed of (or, ideally, recycled; however, that is a whole different Nova topic).
Therefore, the entire battery should be charged, as a battery being tested has five cells testing normal and one cell showing very low.
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1ly/5.9 x 10^12 miles
Answer:
0.9964
Explanation:
I think that's the right answer but here you go always!
Consider this situation: A baseball travels upward and
rightward through the air. Of the forces listed, identify which
act upon the baseball.
Tap to select the forces that are present.
The forces acting on the baseball are air resistance, and force of gravity.
What are forces present during the upward motion of an object?
The forces which act on an object moving upward will either oppose the motion of the object or help to speed up the object.
The forces present during upward motion include;
force of air resistanceforce of gravityapplied forceThe forces acting on a baseball thrown upwards which also travels rightward include the following;
force of air resistance which oppose the upward motion of the baseballforce of gravity acting downwards due to the weight of the ball.Thus, the forces acting on the baseball are air resistance, and force of gravity.
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The complete question is below:
Consider this situation: A baseball travels upward and
rightward through the air. Of the forces listed, identify which
act upon the baseball. (force of air resistance, force of gravity, weight of the ball, frictional force).
In his experiments on "cathode rays" during which he discovered the electron, J. J. Thomson showed that the same beam deflections resulted with tubes having cathodes made of different materials and containing various gases before evacuation.(b) When he applied various potential differences to the deflection plates and turned on the magnetic coils, alone or in combination with the deflection plates, Thomson observed that the fluorescent screen continued to show a single small glowing patch. Argue whether his observation is important.
The mobility of the light source depends on the interaction between the magnetic and electric forces.
What is a cathode ray?Cathode ray refers to the electron beam that moves from the negatively charged cathode to the positively charged anode at the other end of the vacuum tube.
J. J. Thomson demonstrated that the identical beam deflections produced tubes with cathodes composed of varied materials and containing a range of gases prior to evacuation.
This discovery is significant because the interaction of the magnetic and electric forces determines the mobility of the light source.
Therefore, the interaction of the magnetic and electric forces determines how mobile the light source is.
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A cubical surface surrounds a point charge q . Describe what happens to the total flux through the surface if (a) the charge is doubled,
According to Gauss law, the electric flux is defined as the electric field multiplied by the area of the surface in a plane perpendicular to the field.
Gauss law is defined mathematically in Equation 1
Φ=Q ϵo (1)
Where;
Q is enclosed charge
ϵo is the permittivity of the free space
According to the above gaussian relation, If the charge is doubled, then flux will also be doubled. This is because there is a direct relationship between the total flux and charge present in the electric field. This means that the net electric flux is dependent on the charge moving through the surface of the cube.
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apply concepts what two forces are acting on the blocks as they slide over the wet sand? which one is a noncontact force?
Gravity is the non contact force.
What is a Gravity?Gravity is a fundamental interaction in physics that causes all objects with mass or energy to attract one another. The electromagnetic force, the weak interaction, and the strong interaction are all significantly stronger than gravity, which is by far the weakest of the four fundamental interactions. As a result, it has no appreciable impact on subatomic particle level phenomena. However, at the macroscopic level, gravity is the most important interaction between things and governs the motion of planets, stars, galaxies, and even light.
On Earth, gravitational pull lends weight to tangible objects, and the moon's gravitational pull generates ocean tides. In addition, gravity plays a significant role in many biological processes, including gravitropism, which directs plant growth, and the movement of fluids in multicellular organisms. Gravity may affect how the immune system and cells differentiate in the human body, according to research on the effects of weightlessness.
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how many meters are in 45 minutes
Answer:
*I think you meant seconds
45 min = 2,700 sec
Explanation:
Hope it helps!!!
:}
To win the game, a place kicker met kick a
football from a point 35 m (38.276 yd) from
the goal, and the ball must clear the crombar,
which is 3.05 m high. When kicked, the ball
leaves the ground with a speed of 20 m/s at
an angle of 45.9 from the horizontal.
The acceleration of gravity is 9.8 m/s²
By how much vertical distance does the ball
clear the crowbar?
Answer in units of m.
Answer:
2.08 m (2 d.p.)
Explanation:
Constant Acceleration Equations (SUVAT)
[tex]\boxed{\begin{array}{c}\begin{aligned}v&=u+at\\\\s&=ut+\dfrac{1}{2}at^2\\\\ s&=\left(\dfrac{u+v}{2}\right)t\\\\v^2&=u^2+2as\\\\s&=vt-\dfrac{1}{2}at^2\end{aligned}\end{array}} \quad \boxed{\begin{minipage}{4.6 cm}$s$ = displacement in m\\\\$u$ = initial velocity in ms$^{-1}$\\\\$v$ = final velocity in ms$^{-1}$\\\\$a$ = acceleration in ms$^{-2}$\\\\$t$ = time in s (seconds)\end{minipage}}[/tex]
When using SUVAT, assume the object is modeled as a particle and that acceleration is constant.
-------------------------------------------------------------------------------------
When a body is projected through the air with initial speed (u), at an angle of θ to the horizontal, it will move along a curved path.
Therefore, trigonometry can be used to resolve the body's initial velocity into its vertical and horizontal components:
Horizontal component of u (x) = u cos θVertical component of u (y) = u sin θSince the projectile is modeled as moving only under the influence of gravity, the only acceleration the projectile will experience will be acceleration due to gravity.
If the ball is kicked at an initial velocity of 20 m/s from flat ground at an angle of 45.9° then:
Horizontal component of u = 20 cos 45.9°Vertical component of u = 20 sin 45.9° Resolving horizontallyThe horizontal component of velocity is constant, as there is no acceleration horizontally.
Resolving horizontally, taking → as positive:
[tex]s=35 \quad u=20 \cos 45.9^{\circ} \quad v = 20 \cos 45.9^{\circ} \quad a=0[/tex]
[tex]\begin{aligned}\textsf{Using} \quad s&=\left(\dfrac{u+v}{2}\right)t\\\\35&=\left(\dfrac{20 \cos 45.9^{\circ}+20 \cos 45.9^{\circ}}{2}\right)t\\35&=(20 \cos 45.9^{\circ})t\\t&=\dfrac{35}{20 \cos 45.9^{\circ}}\\\implies t&=2.51468288...\; \sf s\end{aligned}[/tex]
Therefore, the time is takes for the ball to reach the crossbar is 2.51 s.
Resolving verticallyAcceleration due to gravity = 9.8 ms⁻²
Resolving vertically, taking ↑ as positive:
[tex]u=20 \sin 45.9^{\circ} \quad a=-9.8 \quad t=2.51468288...[/tex]
[tex]\begin{aligned}\textsf{Using} \quad s&=ut+\dfrac{1}{2}at^2\\\\s&=(20 \sin 45.9^{\circ})(2.51468288...)+\dfrac{1}{2}(-9.8)(2.51468288...)^2\\s&=36.1171982...-30.9857870...\\\implies s&=5.131411132...\; \sf m\end{aligned}[/tex]
SolutionTo find by how much the ball clears the crossbar, subtract the height of the crossbar (3.05 m) from found the vertical height of the ball at 2.51 s:
[tex]\implies 5.13141132...-3.05=2.08\; \sf m\;(2 \: d.p.)[/tex]
Therefore, the ball clears the crossbar by 2.08 m (2 d.p.).
You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood. Which would be the best choice for the typeof mirror? (a) flat (b) concave (c) convex
You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood which means the best choice of the type of mirror for this operation is a concave one and is denoted as option B.
What is Concave mirror?This type of mirror usually has a reflective surface that is curved inward and away from the light source. They also reflect light inward to one focal point which is done by reflecting all the rays parallel to its axis and converge them at a single point.
For fire to occur, then we need a large concentration of light rays which will help reflect all the sunlight from a mirror onto some paper under a pile of wood thereby causing the fire.
This is therefore the reason why concave mirror was chosen as the most appropriate choice.
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Which formula is equivalent to D = m V ?
the earth has a mass of 6x10^24 kg, and a radius of 6400 km. What is the density of the earth in kg/m^2.
The density of the earth is 3.51×10¹⁰ kg/m³
What is Density?Density can be defined as the ratio of mass to the volume of a body. The S.I unit of density is kg/m³
To calculate the density of the earth, we use the formula below.
Formula:
D = m/v............ Equation 1Where:
D = Denstiy of the earthm = Mass of the earthv = Volume of the earthFrom the question,
Given:
m = 6×10²⁴ kgNote: Since the earth is a spherical in shape, we can calculate the volume of the earth using the volume of a sphere
v = 4πr³/3 = (4×3.14×6400000³)/3 = 1.71×10¹⁴ m³Substitute these values into equation 1
D = (6×10²⁴)/(1.71×10¹⁴) D = 3.51×10¹⁰ kg/m³Hence, the density of the earth is 3.51×10¹⁰ kg/m³.
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A circular loop of wire with a radius of 4.0cm is in a uniform magnetic field of magnitude 0.060T . The plane of the loop is perpendicular to the direction of the magnetic field. In a time interval of 0.50s , the magnetic field changes to the opposite direction with a magnitude of 0.040T . What is the magnitude of the average emf induced in the loop?(a) 0.20V(b) 0.025V(c) 5.0mV(d) 1.0mV(e) 0.20mV
E. The magnitude of the average emf induced in the loop is 0.20 mV.
Average emf induced in the circular loopThe magnitude of the average emf induced in the loop is calculated as follows;
emf = NA(B₁ - B₂)/t
where;
A is area of the loop N is number of turnsB1 is initial magnetic fieldB2 is final magnetic fieldt is timeA = πr² = π(0.04)² = 5.027 x 10⁻³ m²
emf = (1)(5.027 x 10⁻³)(0.06 - 0.04)/0.5
emf = 2.01 x 10⁻⁴ V
emf = 0.201 mV
Thus, the magnitude of the average emf induced in the loop is 0.20 mV.
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if a gas occupies 15 l at pressure of 2.3 atm what would the volume be at 3.1 atm
The volume occupied by the gas at 3.1 atm pressure will be 11.12 L.
What is Boyle's Law?When a gas is maintained at a constant temperature and with a certain mass, Boyle's law states that the pressure of the gas is inversely proportional to its volume.
To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another. In 1662, the Anglo-Irish chemist Robert Boyle proposed the Boyle's law.
According to Boyle's law :
P1V1=P2V2 where,
P1 and P2 are the pressure and,
V1 and V2 are the volume of container.
As per the question, the given values are :
V1=15 L
P1= 2.3 atm and,
P2= 3.1 atm
So by using Boyle's theorem :
2.3 atm× 15 L = 3.1 atm× V2
34.5=3.1 atm × V2
V2=11.12 L
Hence, the volume at 3.1 atm pressure will be 11.12 L.
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A tennis ball is dropped from 1.98 m above
the ground. It rebounds to a height of 1.05 m.
The acceleration of gravity is 9.8 m/s².
With what velocity does it leave the ground?
The ball will leave the ground with the velocity of 4.5 m/s.
What is Velocity ?Velocity is the distance travelled in a specific direction per time taken. It is measured in m/s
Given that a tennis ball is dropped from 1.98 m above the ground. It rebounds to a height of 1.05 m. The acceleration of gravity is 9.8 m/s².
At maximum height, final velocity is zeroThe maximum height H = 1.05 mThe initial velocity u = 0Using the formula
v² = u² - 2gH
0 = u² - 2 × 9.8 × 1.05
u² = 20.58
u = √20.58
u = 4.54 m/s
Therefore, the ball will leave the ground with the velocity of 4.5 m/s.
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5. If a bullet leaves the muzzle of a rifle with a speed of 600 ms and the barrel of the rifle is 0.800m long, at what rate is the bullet accelerated while in the barrel?
The acceleration of the bullet leaving the barrel is 2.25 x 10⁵ m/s².
Given,
Velocity of the bullet leaving the barrel, v = 600 m/s
Distance travelled by the bullet = Size of the rifle = s = 0.800 m
According the Third Equation of Motion which relates velocity with the distance and acceleration says that,
v² = u² + 2as ;
where 'v' and 'u' are final and initial velocity of the bullet respectively
'a' is the acceleration of the bullet
's' is the distance travelled by the bullet
here u = 0 m/s
(600)² = 0² + 2 * (0.800) * (a)
360000 = (1.6) * (a)
a = [tex]\frac{360000}{1.6}[/tex]
a = 225000 m/s²
a = 2.25 x 10⁵ m/s²
Therefore the rate at which bullet accelerated while being in the barrel is 2.25 x 10⁵ m/s².
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Two cats jump off a roof that is 23m off the ground. Cat A jumps directly up with a velocity of 7m/s, and cat B jumps directly down with a velocity of 7m/s. How far up does cat A go? How fast does cat A go just before it hits the ground? How fast does cat B go just before it hits the ground? How much longer is cat A in the air than cat B?
The height reached by cat A is 2.5 m.
The speed of cat A before it hits the ground is 36.4 m/s.
The speed of cat B before it hits the ground is 22.39 m/s.
The time spent in air by cat A than cat B is 1.43 seconds.
Time of motion of cat A
The time of motion of cat A is calculated as follows;
h = vt - ¹/₂gt
-23 = 7t - 4.9t²
4.9t² - 7t - 23 = 0
solve the quadratic equation using formula method;
a = 4.9, b = -7, c = - 23
t = 3.0 seconds
Time of motion of cat BThe time of motion of cat B is calculated as follows;
h = vt - ¹/₂gt
23 = 7t + 4.9t²
4.9t² + 7t - 23 = 0
solve the quadratic equation using formula method;
a = 4.9, b = 7, c = -23
t = 1.57 seconds
Height reached by cat Ah = u²/2g
h = (7²)/(2 x 9.8)
h = 2.5 m
Speed of cat A before it hits the groundv = u + gt
v = 7 + 3(9.8)
v = 36.4 m/s
Speed of cat B before it hits the groundv = u + gt
v = 7 + 1.57(9.8)
v = 22.39 m/s
Time spent in air by cat A than cat B
Time difference = 3 s - 1.57 s = 1.43 seconds
Thus, the height reached by cat A is 2.5 m.
The speed of cat A before it hits the ground is 36.4 m/s.
The speed of cat B before it hits the ground is 22.39 m/s.
The time spent in air by cat A than cat B is 1.43 seconds.
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An athlete is running a race. The athlete’s body needs energy. Which type of organelle in the athlete’s cells supplies the energy for cellular function?.
Mitochondria is a type of organelle in the athlete’s cells supplies the energy for cellular function.
Since mitochondria are the cellular organelles in charge of producing aerobic ATP, the "health" of mitochondria is crucial for proper cellular operation
Which organelles that give energy to the cell?Mitochondria. Dictionary Britannica, Inc. Mitochondria, or "powerhouses," are oval-shaped organelles that are present in the majority of eukaryotic cells. During cellular respiration, substances like glucose are converted by mitochondria into ATP, an energy molecule (adenosine triphosphate).
How Mitochondria produce ROS?The generation of ROS by mitochondria can result in oxidative damage to mitochondrial proteins, membranes, and DNA, impairing their capacity to synthesize ATP and perform a wide range of metabolic processes, including the tricarboxylic acid cycle, fatty acid oxidation, the urea cycle, amino acid metabolism, haem synthesis, and FeS center assembly, which are crucial to the normal functioning of most cells. The tendency of mitochondria to release intermembrane space proteins, such as cytochrome c (cyt c), to the cytosol by mitochondrial outer membrane permeabilization (MOMP), and so trigger the cell's apoptotic machinery, can also be increased by mitochondrial oxidative damage. The mitochondrial permeability transition pore (PTP), which opens up the inner membrane to tiny molecules in conditions like ischaemial reperfusion damage, is also induced by mitochondrial ROS generation. So it should come as no surprise that mitochondrial oxidative damage plays a role in a variety of diseases. Additionally, mitochondrial ROS may behave as a modifiable redox signal, impacting a number of activities in the mitochondria, cytosol, and nucleus in a reversible manner.
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On the basis of the repulsive nature of the force between like charges and the freedom of motion of charge within a conductor, explain why excess charge on an isolated conductor must reside on its surface.
Excess charge on an isolated conductor must reside on its surface because excess charge moves away until they reach the surface of the body.
Charged conductors in electrostatic equilibrium exhibit a number of interesting properties. The electric field beneath the surface of a charged conductor is zero when it is in electrostatic equilibrium, which is one of its properties. The repulsive nature of force between similar charges and the liberty of motion of charges within a conductor allows for the establishment of equilibrium within charges present in the conductor. Due to this fact, excess charges carry like type of charge as contained within the conductor they are thus repelled away from the conductor till they reach the outer surface of the conductor.
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A tuna jumps out of the water with an initial velocity of 44 feet per second (assume its starting height is 0 feet). Use the vertical motion model, h 16t²+uts where is the initial velocity in feet per second and is is the height in feet, to calculate the amount of time the tuna is in the air before it hits the ground again. Round your answer to the nearest tenth if necessary.
The time spent in air by the tuna before it hits the ground is determined as 1.375 seconds.
What is time spent in air by an object?
The time spent in air by an object or a projectile is the total time of motion of the object or projectile.
Final velocity of the tuna when it hits the groundThe time spent in air by the tuna can be determined by finding equation of the final velocity of the tuna when it hits the ground as follows;
h = 16t² + ut
where;
h is the height traveled by the tunau is the initial velocity of the tunet is the time of motionVelocity of the tuna when it hits the ground,
v = dh/dt
dh/dt = 32t + u
when the tuna hits the ground, final velocity = 0
0 = 32t + u
0 = 32t + 44
t = -44/32
|t| = 1.375 seconds
Thus, the time spent in air by the tuna before it hits the ground is determined as 1.375 seconds.
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A toy doll and a toy robot are standing on a frictionless surface facing each other. The doll has a mass of 0. 20 kg, and the robot has a mass of 0. 30 kg. The robot pushes on the doll with a force of 0. 30 n. The magnitude of the acceleration of the robot is.
The magnitude of the acceleration of the robot is 1m/s^2 .
Given ,
A toy doll and a toy robot are standing on a frictionless surface facing each other .
The mass of the doll = 0.20kg
The mass of the robot = 0.30kg
Force applied by the robot on the doll = 0.30N
We know the force and mass of the robot , so from this we can calculate the acceleration by applying Newton's laws of motion ,
Thus , F= ma
a = F/m = 0.30N / 0.30k
a = 1 m/s^2
Hence , the magnitude of the acceleration of the robot is 1m/s^2 .
What is acceleration ?Acceleration is the rate of change in velocity.
Positive acceleration it occurs when an object speeds up. Negative acceleration it occurs when an object slows down.
Acceleration is a change of velocity over a period of time, expressed by the equation,
A=Δv/t
The unit of acceleration is m/s^2.
The dimensional formula of acceleration is [M^0 L^1 T^-2] .
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Why does it make sense for the valence electrons to stay the same within a group?.
It makes sense for the valence electrons to stay the same within a group because these elements have same chemical properties.
We have a group from Periodic table.
We have to investigate the reason behind the fact that why elements with same number of valence electrons share the same group.
What is Periodic Table?Periodic Table is a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (similar chemical properties) appear in vertical columns.
According to the question -
It is true that the number of valence electrons in the outermost shell of the elements of same group are equal. The number of valence electrons in the outermost orbit of the elements of the same group is same as the group number to which they belong. The elements in the same group have same number of valence electrons in their outermost shell. Due to this the elements have almost same Physical properties, Chemical properties and Reactivities of the elements.
Hence, it makes sense for the valence electrons to stay the same within a group because the elements in the same group have same properties.
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A cook puts 9.00g of water in a 2.00 -L pressure cooker that is then warmed to 500°C . What is the pressure inside the container?
If a cook puts 9.00g of water in a 2.00 -L pressure cooker that is then warmed to 500°C, the pressure inside the container is 15.8 atm.
What is the pressure inside the container?From the ideal gas law;
PV = nRT
Where P is pressure, V is volume, n is amount of substance, T is temperature and R is the ideal gas constant (0.08206Latm/molK).
Given the data in the question;
Mass of water m = 9.00gVolume V = 2.00LTemperature = 500°C = ( 500 + 273.15)K = 773.15KPressure P = ?First we determine the amount of water n.
We know that the molar mass of water is 18.01528 g/mol.
Hence
n = mass / molar mass
n = 9.00g / 18.01528 g/mol
n = 0.4995mol
Now, plug the values into the equation above and solve for P
PV = nRT
P = nRT / V
P = ( 0.4995mol × 0.08206Latm/molK × 773.15K ) / 2.00L
P = ( 31.6906Latm ) / 2.00L
P = 15.8 atm
If a cook puts 9.00g of water in a 2.00 -L pressure cooker that is then warmed to 500°C, the pressure inside the container is 15.8 atm.
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Different types of brain injuries and what they affect
Answer:
Explanation:
Traumatic brain injury (TBI) happens when a sudden, external, physical assault damages the brain. It is one of the most common causes of disability and death in adults. TBI is a broad term that describes a vast array of injuries that happen to the brain. The damage can be focal (confined to one area of the brain) or diffuse (happens in more than one area of the brain). The severity of a brain injury can range from a mild concussion to a severe injury that results in coma or even death.
Brain injury may happen in one of two ways:
CLOSE BRAIN INJURY : Closed brain injuries happen when there is a nonpenetrating injury to the brain with no break in the skull. A closed brain injury is caused by a rapid forward or backward movement and shaking of the brain inside the bony skull that results in bruising and tearing of brain tissue and blood vessels. Closed brain injuries are usually caused by car accidents, falls, and increasingly, in sports. Shaking a baby can also result in this type of injury (called shaken baby syndrome).
PENETRATING BRAIN INJURY: Penetrating, or open head injuries happen when there is a break in the skull, such as when a bullet pierces the brain.
DIFFUSE AXONAL INJURY: Is the shearing (tearing) of the brain's long connecting nerve fibers (axons) that happens when the brain is injured as it shifts and rotates inside the bony skull. DAI usually causes coma and injury to many different parts of the brain. The changes in the brain are often microscopic and may not be evident on computed tomography (CT scan) or magnetic resonance imaging (MRI) scans.
PRIMARY BRAIN INJURY: Refers to the sudden and profound injury to the brain that is considered to be more or less complete at the time of impact. This happens at the time of the car accident, gunshot wound, or fall.
SECONDARY BRAIN INJURY : Refers to the changes that evolve over a period of hours to days after the primary brain injury. It includes an entire series of steps or stages of cellular, chemical, tissue, or blood vessel changes in the brain that contribute to further destruction of brain tissue.