Answer:Galaxies
Explanation:
I know about this stuff, I hope it helped!
Answer:
B-galaxies
Explanation:
e2020
How can speed and velocity be used to describe motion?
Answer:
speed described how fast the object moves velocity describes how fast and in what direction its moved..
a tennis ball mashine fires aball vertically upward at time t=0 at 19.6 m/s assume the air resistance is negligible and take g=9.8m/s^ calculate the displacement and velocity of the ball at t=1.0s,2.0s,3.0s and 4.0s
Answer:
See the answers below.
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]y=y_{o}+v_{o}*t+0.5*g*t^{2}[/tex]
where:
y = final elevation [m]
yo = initial elevation = 0
vo = initial velocity = 19.6 [m/s]
t = time required [s]
g = gravity acceleration = 9.81 [m/s²]
Now we can replace the different times in the equation above.
For t = 1 [s]
[tex]y=0+(19.6*1)-0.5*9.81*(1^{2} )\\y = 14.7 [m][/tex]
For t = 2 [s]
[tex]y=0+(19.6*2)-0.5*9.81*(2^{2} )\\y = 19.58 [m][/tex]
For t = 3 [s]
[tex]y=0+(19.6*3)-0.5*9.81*(3^{2} )\\y = 14.7 [m][/tex]
For t = 4 [s]
[tex]y=0+(19.6*4)-0.5*9.81*(4^{2} )\\y = -0.08 [m][/tex]
We can see that the sign of gravitational acceleration is negative, since it points in the opposite direction to the motion of the launch.
Note when the time is equal to 4 seconds we see that the distance is 0, ie the tennis ball has reached its maximum height and begins to descend.
The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastics or rubber covers on them. Give reason.
Chef Andy tosses an orange in the air, then catches it again at the same height. The orange is in the air for 0.75\,\text s0.75s0, point, 75, start text, s, end text. We can ignore air resistance.
What was the orange's velocity at the moment it was tossed into the air?
Answer:
3.68 m/s
Explanation:
Applying the equation of motion;
v = u + at. ....1
Where
u = initial speed
v = final speed
a = acceleration
t = time taken
Given;
Total time of flight t = 0.75s
Acceleration due to gravity g = 9.8 m/s^2
Considering the first phase of flight, during the upward motion to the maximum height. The final velocity at the maximum height is zero and the time of flight of the phase is equal to half of the total flight time.
v1 = 0
t1 = t/2 = 0.75/2 =0.375s
From equation 1;
v1 = u - gt1
Substituting the values;
0 = u - 9.8(0.375)
Solving for u;
u = 9.8(0.375)
u = 3.675
u = 3.68 m/s
Initial velocity = 3.68 m/s
Chef Andy tosses an orange in the air, then catches it again at the same height. The orange is in the air for 0.75 s. We can ignore air resistance.
What was the orange's velocity at the moment it was tossed into the air?
Answer: 3.68 m/s
Please select the word from the list that best fits the definition
Calculated by angular velocity/time
Answer:
Hi... Your answer is angular acceleration
What does positive and negative speed/velocity mean?
Answer:
Positive speed means ur going forward. Negative speed means ur going backward.
Explanation:
Answer:
velocity is usually always positive if the object is moving to the right but is negative if the object is moving to the left.
Explanation:
speed tells how fast the object is moving without saying anything about it's direction. but speed will always be positive
My buddy and I have just finished a dive to 15 metres/50 feet for 60 minutes. We want to return to the same site and depth and stay another 60 minutes. We can ______________________ to see about how long we have to remain at the surface to have enough no stop time. (choose all that apply)
Answer:
1) Periodically check the no stop or NDL time on their computers
2) The dive computer planning mode can be used if available
3) Make use of a dive planning app
4) Check data from the RDP table or an eRDPML
Explanation:
The no stop times information from the computer gives the no-decompression limit (NDL) time allowable which is the time duration a diver theoretically is able to stay at a given depth without a need for a decompression stop
The dive computer plan mode or a downloadable dive planning app are presently the easiest methods of dive planning
The PADI RDP are dive planners based on several years of experience which provide reliable safety limits of depth and time.
An Airplane taxis onto the runway going at 10 m/s. If it can accelerate steady at 3
m/s2 and its take-off speed is 90 m/s, what length of runway will it need? *
130 m
1350 m
1333 m
2666.7 m
A race car was is moving at a constant speed of 35 m/s. A security car was
Answer: 1333 m
the length of runway it will need is S = [tex]\frac{90^{2}-10^{2} }{2.3}=1333[/tex] (m)
Explanation:
1. how to find out the elecronic structure of
i. lithium
ii. potassium
iii. sodium
Answer:
See explanation
Explanation:
To find out the electronic structure of each element, you must know the number of electrons it contains.
If you find that out(the number of electrons in the neutral atom of an element is the same as its atomic number). Then you arrange those electrons in such a way that the first shell has only two electrons and subsequent shells have eight electrons.
Look up the groups to which the elements belong in the periodic table All the elements are in group 1 so the last shell must have only one electron.
please someone knows the answer? it is physics
Answer:C
Explanation: I took the quiz if you don't believe me then your gonna miss the problem.
———PLEASE HELP——— I NEED THE ANSWERS (ILL GIVE BRAINLIST)
Answer:
mountains, earthquakes, tsunamis
Explanation:
A horse pulls a wagon forward. What is the equal and opposite force for the force of the horse pushing down on the ground as described by Newton's third law
Answer:
The equal and opposite force is equal to the sum of any frictional force to the product of the mass of the wagon and the acceleration of the wagon
Explanation:
Newton's third law states that for every action, or force, there is an equal and opposite reaction
The equal and opposite force = The mass of the Wagon, m × The acceleration of the wagon, a + Any frictional force present, [tex]F_f[/tex]
Whereby the force with which the horse pulls the wagon = F, mathematically, we have;
The equal and opposite force = -F = m × a + [tex]F_f[/tex].
Answer:
Ground pushes up on the horse’s hooves
Explanation:
khan academy
Find the maximum velocity possible for the person on the swing.
if someone could explain with work that would be very much appreciated since I wasn't there when this was discussed in class.
Answer:
The maximum possible speed is 4.85 m/s.
Explanation:
The Principle Of Conservation Of Mechanical Energy
In the absence of friction, the total mechanical energy is conserved. It means that :
[tex]E_m=U+K[/tex] is constant, being U the potential energy and K the kinetic energy
U=mgh
Where m is the mass of the object, g is the gravitational acceleration and h is the height from a fixed reference.
[tex]\displaystyle K=\frac{mv^2}{2}[/tex]
Where v is the speed.
When the person is at a maximum height of 2 meters, the speed is 0. Thus the mechanical energy is made only of potential energy.
Let's fix the reference for the height to the point where the person is at minimum height (1 m from the ground level). The maximum height with respect to this reference is h=2.2 m - 1 m = 1.2 m.
The potential energy is:
U = m*9.8*1.2
U = 11.76m
When the person is at the minimum (zero) height, the mechanical energy is made only of kinetic energy. Since the mechanical energy is conserved, then:
[tex]\displaystyle \frac{mv^2}{2}=11.76m[/tex]
Multiplying by 2 and simplifying by m:
[tex]v^2=2*11.76=23.52[/tex]
Solving for v:
[tex]v=\sqrt{23.52}=4.85[/tex]
[tex]\boxed{v=4.85}[/tex]
The maximum possible speed is 4.85 m/s.
what should we do to be a computer engineer ?
Answer:
to be an eginere u would have to go to college and study hard
Explanation:
PLZ HELP!! WILL MARK BRAINLIEST!!
As waves get closer to a beach they:
decrease in energy
increase in energy
decrease in height
increase in length
The distance of an illuminated object from its light source is decreased to 1/3 while the luminous flux remains constant. Which is true of the illuminance on the object
Answer:
The illuninance being multiplied by 9
Explanation:
Answer:
The illuminance will be multiplied by 9.
Explanation:
The result of the superposition of two or more waves is called?
A reflection
B interference
C refraction
Answer:
Answer is interference
A 20 cm square frame that can rotate about the 00' axis is placed in a homogeneous magnetic field with 0.5T induction directed vertically downwards.
a) Draw vectors of forces acting on the sides of the frame.
b) calculate the values of these forces and the resultant force acting on the frame.
c) calculate the torque of the frame.
The solution to this task is f00king Dis.
2. What mass of sulphuric acid (density 1.84 g/
cm) can be held in a 250 ml bottle?
[tex]volume \: = 250 \: ml \\ 1 \: ml = 1 {cm}^{3} \\ 250 \: ml = (1 \times 250) = 250 {cm}^{3} \\ mass \: = \: \frac{density}{volume} \\ mass \: = \: \frac{1.84}{250} \\ mass \: = \: 0.00736 \: g[/tex]
The mass of the sulfuric acid will be 0.00736 g.
What is mass?A physical body's mass is the amount of matter it contains. This is also a measurement of inertia of a particular body, or resistance to acceleration whenever a net force will be applied.
Calculation of mass.
Given data:
density (d) = 1.84 g/cm
volume (v) = 250 ml
Now, use the mass formula.
Mass (m) = density (d) / volume (v)
Mass (m) = 1.84 / 250
Mass (m) = 0.00736 g
Therefore, the mass of the sulfuric acid will be 0.00736 g.
To know more about mass.
https://brainly.com/question/19694949.
#SPJ2
In which of the following sentences is work used in the everyday sense of the word?
a. Lifting a heavy bucket involves doing work on the bucket.
b. The force of friction usually does negative work.
c. Sam and Rachel worked hard pushing the car.
d. Work is a physical quantity:
Answer:
Hi... Your answer is B... a is not work because work is ziro
Define the term electrical resistance as applied to current electricity
Explanation:
Electrical resistance can be defined as the opposition to the flow of current in an electric circuit or wire. The resistance converts electrical energy into thermal energy, this serves as friction in mechanical systems. And this electrical energy converted to thermal is dissipated.
By ohm's law we have
Resistance R = Voltage V/ Current I
Practice
1. Nitrogen and oxygen
en and oxygen in their liquid states have densities only 0.8 and 0.9
water. Atmospheric pressure is due primarily to the weight of nitro-
and oxygen gas in the air. If the atmosphere liquefied, would its depth
be greater or less than 10.3 m?
Answer:
In both cases the height is greater than 10.3 m
Explanation:
Pressure is defined by the relationship
P = F / A
in this case the force is the weight of the two gases
F = W = m g
If we use the definition of density
ρ = m / V
V = A h
m = ρ A h
we substitute
P = ρ g h
h = [tex]\frac{P}{\rho g}[/tex]
For this case the density of the gases is
ρ' = 0.9 [tex]\rho_{water}[/tex]
h =[tex]\frac{P}{0.9 \ \rho_{water} g}[/tex]
we calculate
ρ’= 0.9 \rho_{water}
h = 1 105 / (0.9 1000 9.8)
h = 11.3 m
ρ’= 0.8 \rho_{water}
h = 1 105 / (0.8 1000 9.8
h = 12.8 m
In both cases the height is greater than 10.3 m
What is the frequency of this wave?
O1
O2
O3
O4
Answer:
f = 1/t
1/1
=1
Explanation:
The frequency f = 1/T = ω/2π of the motion gives the number of complete oscillations per unit time. It is measured in units of Hertz, (1 Hz = 1/s).
AP physics here! Please help me answer only this question and then explain how you got your answer. After that, I will do the rest of the questions by myself using your explanation. Come here only if you know AP physics.
Answer:
displacement: 0
Distance: 30
Explanation:
lol, i asked my brother, he's also in 10th grade
different between group IA and IIA elements
Answer:
Group IA elements have only one valency electron while Group IIA have two valency electrons.
Group IA elements have cations with higher charge density hence polarizing anions easier resulting into covalent character while Group IIA elements have cations with lower charge density hence difficulty in distorting anions resulting into a ionic character. This is due to difference in cationic radii and charges
Help help help plzzz. A 15-kilogram wagon originally at rest on a level road is pulled by a rope that exerts a constant horizontal force of 45 newton's, If the frictional forces on the wagon total 15 newton's, what will be its acceleration ? *
2.0 〖m/s〗^2
4.0 〖m/s〗^2
15 〖m/s〗^2
30 〖m/s〗^2
3.0 〖m/s〗^2
Answer:
A. 2m/(s^2)
I hope it will be useful.
PHYSICS HELP PLEASE,, I’LL MAKE YOU THE BRAINLIEST!
(look at attached picture for context)
Q: Place the block at the top of a 30 degree ramp. What is the net force on the block when it begins to slide down the ramp? What is the acceleration of the block down the ramp? SHOW WORK/CALCULATIONS
First, let
f = mag. of static friction
n = mag. of normal force
w = m g = mag. of gravitational force (the weight of the block)
m = mass of the block
g = 9.80 m/s² (the mag. of the acceleration due to gravity)
a = acceleration of the block
It's the static friction that interests us at the moment "when it begins to slide", meaning the precise moment at which static friction is at its maximum. At that point, the friction has magnitude f such that
f = 0.5 n
The problem is much easier to work through if you split up the forces into components acting parallel and perpendicular to the ramp. By Newton's second law, we have
• the net force acting parallel to the ramp is
∑ F = - f + w sin(30°) = m a
• and the net force acting perpendicular to the ramp is
∑ F = n - w cos(30°) = 0
Hence the net force on the block as it begins to slide acts only in the parallel direction. Note that we take the positive parallel direction to be the one in which the block slides down the ramp (i.e. opposing the friction force), and the positive perpendicular direction to be the same as the normal force.
Solve the second equation for n :
n = m g cos(30°) = (100 kg) (9.80 m/s²) cos(30°) ≈ 849 N
Then
f = 0.5 (849 N) ≈ 424 N
and so the net force on the block is
∑ F ≈ - 424 N + (100 kg) (9.80 m/s²) sin(30°) ≈ 65.6 N
Next, you want to find the acceleration of the block as it is sliding down the ramp, during which time kinetic friction kicks in. We have the same equations as above, except now f = 0.3 n. So we still have n ≈ 849 N, which gives
f = 0.3 (849 N) ≈ 255 N
∑ F = - f + w sin(30°) = m a
→ - 255 N + (100 kg) (9.80 m/s²) sin(30°) ≈ (100 kg) a
→ a ≈ 2.35 m/s²
PLEASE HELP ME!!
Which health-related fitness component would be at an inadequate level if the person did poorly on a sit and reach fitness test?
a
Cardiovascular Endurance
b
Flexibility
c
Muscular Strength
d
Power
Answer:
B
Explanation:
The nucleus in an iron atom has a radius of about 4.0 10-15 m and contains 26 protons. (a) What is the magnitude of the repulsive electrostatic force between two of the protons that are separated by 4.0 10-15 m?
Answer:
The repulsive electrostatic force between two of the protons is 14.4 N.
Explanation:
Given;
distance between the two protons, r = 4 x 10⁻¹⁵ m
charge of a proton, q = + 1.6 x 10⁻¹⁹ C
The repulsive electrostatic force between two of the protons is calculated by applying Coulomb's law;
[tex]F = \frac{k q_1 q_2 }{r^2} \\\\where;\\k \ is \ Coulomb's \ constant = 9\times 10^9 \ Nm^2/C^2 \\\\F = \frac{9\times 10^9 \ (1.6\times 10^{-19})^2}{(4 \times 10^{-15})^2} \\\\F = 14.4 \ N[/tex]
Therefore, the repulsive electrostatic force between two of the protons is 14.4 N.
what is rusting?How does it occur?
Answer:
Rust occurs when iron or its alloys, such as steel, corrode. The surface of a piece of iron will corrode first in the presence of oxygen and water.The process of rusting is a combustion reaction, similar to fire. Left in contact with oxygen, iron will react with the oxygen to form rust.
Hope this helps!!
Answer:
iron is oxidation reaction
Explanation:
it occurs when iron reacts with water and oxygen to form hydrated iron(iii) oxide