Answer:
1500 kg is mass of car
Explanation:
F = ma
F/a = m
4500n / 3 m/s^2 = 1500 kg
4.
A steel plate that weighs 200 N and has a u with the asphalt of 0.6. If the steel
plate is sliding along the asphalt (constant velocity), what is the force of friction present?
Given
Want
Equation and solve
Answer:
120N
Explanation:
The question gives us Mg = 200 N and in this equation Mg is equal to the normal force. Kinetic friction is calculated by normal force * coefficient of kinetic friction. Therefore kinetic friction = 200N * 0.6 = 120N
A .4Kg hula-hoop is rolled down a hill. It has a diameter of 1.2m. The hula-hoop completes 3.4 rotations every 2.8 seconds. What is the linear velocity of the hoop as it comes down the hill?
4.58m/s
Explanation:
V= displacement/time
circumference=2(pi)r
displacement= (2)(pi)(.6)(3.4)=12.8176
V= 12.8176/2.8
V=4.58 m/s
A student leaves a physics classroom and walks 1 meters south
to go to a water fountain. The student then walks 6
meters north to get to her math class. What is the magnitude
and direction of the girl's total displacement from the physics
classroom to the math classroom? Remember to include
positive or negative signs to indicate direction.
Answer:
5m North
Explanation:
Displacement is the distance between an object's current vs starting position.
If we consider the starting position to be (0,0), we subtract 1 from the y-component to go south and add 6 to go north. We get a position of (0,5), or 5m north.
which imaginary plane describes orbital plane in the solar system?
Answer:
The orbital plane would be the plane that contains the line that joins the sun and the earth (at all times).
When Uranus was first found via telescope, what did the founder originally want to name it?
A.
Georgium Sidus
B.
Oberon
C.
Lysander
D.
Eris
Answer:
Georgium Sidus
Explanation:
Because he wanted to name it after King George three I am pretty sure
Question 7 of 35
Which two conditions are required for a hurricane to form?
A. A lot of ocean water
O B. A high-pressure system
O c. A lack of precipitation
O D. A lot of thermal energy
Describe how a student should carry out an experiment to determine the specific heat capacity of water.
Answer:
Use an insulated beaker full of water. The insulation reduces heat loss. Use a top pan balance to measure the mass of the empty beaker and then the beaker and water. Calculate the mass of the water by subtracting. Measure the temperature of the water before heating using a thermometer. Use a heater with an ammeter connected in series to measure the current in the heater and a voltmeter in parallel with the heater to measure the pd. Record the time the heater is on and measure the end temperature of the water. Use E = I × V × t to determine energy supplied to the Water. Use ΔE = m × c × ΔΘ to determine the specific heat capacity of the water.
If a particle is in a box with a ground state energy of 4 eV, what energy must be absorbed by the system to go from the n
For a particle is in a box with a ground state energy of 4 eV, energy absorbed is mathematically given as
dE=20eV
What energy must be absorbed by the system to go from the n?Generally, the equation for the energy absorbed is mathematically given as
En=n^2E1
Therefore
dE=E3-E2
dE=3^2-2^2)E1
dE=20eV
In conclusion, the energy is
dE=20eV
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A friend is standing 2 m in front of a plane mirror. You are standing 3 m directly behind your friend. What is the distance between you and the image of your friend?.
Answer:
7m
Explanation:
distance between you and the image of your friend=3+2+2= 7m
the extra 2m is the distance between the friend image and the mirror
A friend is standing 2 meters in front of a plane mirror, then the distance between you and the image of your friend is 7 meters.
What is a plane mirror?A mirror with such a flat (planar) shiny surface is referred to as a plane mirror. The angle of reflection for light waves striking a planar mirror is the same as the angle of incidence. The angle between the incident ray and the surface normal is known as the angle of incidence.
Therefore, a collated beam of light does not expand out after reflection from a flat mirror, except for despite the complexity, and the angle of reflection is the ratio between the returned ray and the normal.
In a plane mirror, items in front of the mirror appear to be located behind the plane wherein the mirror is located. A straight line traced from one portion of an object to its equivalent portion in its image forms a right angle and is split in half by the face of a plane mirror.
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a person standing 100m away from a wall fires a gun and hears and echo. Calculate time after which an echo is heard.
a. 1.02 sec
b. 0.42 sec
c. 2.05 sec
d. 0.61 sec
Answer:
Time for sound to travel to wall and back
T = S / V = 200 m / (331 m/s) = .60 sec
d) is correct
!!!WILL MARK BRAINLIEST!!! When working with electric charges, what symbol is used in equations to represent the electric field of an object?
a. r
b. E
c. Fe
d. Q
correct answers only!
The working with electric charges, the symbol used in an equation to represent the electric field of an object is E. Thus, the correct option is B.
What is an electric field?An electric field is defined as the physical field that surrounds the charges or electrically charged particles. The electric field is exerted the force on all the other charged particles and the force is either an attractive or repulsive force.
The electric field around the charges is denoted by the lines called electric field lines. The field lines are radially outwards if the charge is positive and the field lines are radially inwards if the charge is negative. For two charges, the field lines are starts from the positive charge and end with the negative charge.
The electric field equals force per unit test charge. The force is Coulomb's law between two charges. The electric field is also obtained as electric potential per unit displacement.
The electric field is denoted by the letter, E. E = F / q or -V/r, the negative sign indicates that the electric field moves opposite to the potential gradient. The unit of the electric field is Newton per coulomb or volt per meter.
Thus, the correct option is option B.
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The overall shape of our milky way galaxy is thought to be.
PLEASE HELP!! What needs to happen for solid water to change to liquid water?
A. Energy needs to be removed.
B. Atoms need to break apart.
C. A chemical reaction needs to happen.
D. Intermolecular forces need to be overcome.
I took this once already and A was NOT correct.
Answer:
The answer is D.
Explanation:
I took the test.
When solid water changes to liquid water Intermolecular forces need to be overcome. The correct answer is D.
What is phase change?The process of changing a substance from one state of matter to another is called a phase change. The phase change from solid to liquid is called melting or fusion. In order for solid water (ice) to change to liquid water, the intermolecular forces holding the water molecules in a fixed position in the ice lattice need to be overcome.
Here in the Question,
Option A: Energy needs to be removed. This is true for the opposite process, where liquid water changes to solid ice. In this case, heat energy is removed from the water, causing the molecules to lose kinetic energy and slow down, eventually forming a solid lattice. But in the case of solid ice changing to liquid water, energy needs to be added, not removed, to break the intermolecular forces holding the solid together.
Option B: Atoms need to break apart. This is not true for the phase change from solid to liquid. In a phase change, the atoms or molecules in the substance do not break apart or change in any way. Instead, the intermolecular forces between the atoms or molecules are either weakened or strengthened to allow for the phase change.
Option C: A chemical reaction needs to happen. This is also not true for the phase change from solid to liquid. In a chemical reaction, the atoms or molecules in the substance are rearranged to form new substances with different properties. But in a phase change, the atoms or molecules remain the same and only the arrangement and motion of the particles change.
Option D: Intermolecular forces need to be overcome. This is the correct option. The intermolecular forces, such as hydrogen bonds, holding the water molecules in a fixed position in the ice lattice need to be overcome to allow the molecules to move freely and form a liquid. This requires the addition of energy, usually in the form of heat, to the solid ice.
Therefore, The correct answer is D. Intermolecular forces need to be overcome.
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What does RADAR stand for?
Answer:
RAdio Detection And RangingYou have probably heard of radar before. However, we are not going to explore the radar that stands for RAdio Detection And RangingWho made the automobile more affordable for the average American by mass-producing his cars on a moving belt called an assembly line
Select the correct answer. jeff’s father is installing a do-it-yourself security system at his house. he needs to get a device from his workshop that converts electric energy to sound energy. which device is jeff’s father looking for? a. switch b. motor c. buzzer d. bulb e. battery
Answer:
Buzzer
Explanation:
Select the volume units that are greater than one liter.
Answer:
kiloliter and megaliter
Explanation:
kilo is 1000 times bigger and mega is 1e+6 bigger
A girl runs up the down escalator in the mall. If the escalator is moving with a
velocity of 24 m/min and the girl is running with a velocity of 30 m/min, how
far up the escalator can she go in 4 minutes?
O A. 24 m
B. 10 m
C. 30 m
о
D. 48 m
Answer:
24
Explanation:
24 m
Running up - velocity + 30 m/min
Escalator 's moving down velocity - 24 m/min
Sum velocity (30 - 24) = 6 m/min
6 m/min * 4 min = 24 m
We've discussed elevators that are raised with cables, but many elevators use pistons. A pump provides fluid at very high pressure to the piston; the resulting force on the piston raises the elevator and passengers. For a typical piston elevator, the mass of the elevator and passengers is 2000 kg and the radius of the piston is a surprisingly small 4. 2 cm. The elevator begins to move upward, accelerating at 0. 80 m/s2. What is the absolute pressure in the piston?
[tex]p = \frac{f}{s} [/tex]
[tex]f = ma = 2000 \times 0.8 = 1600[/tex]
[tex]s = \pi \: r {}^{2} = 3.14 \times 4. {2}^{2} \times 10 {}^{ - 4} = 55.42 \times 10 {}^{ - 4} [/tex]
[tex]p = \frac{1600}{55.42 \times 10 {}^{ - 4} } = 288 \: 704 \: pascal[/tex]
The absolute pressure in the piston is 288704 pascal.
What is pressure?The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure is the pressure. Pressure is expressed using a variety of units.
Given in the question the mass of the elevator and passengers is 2000 kg and the radius of the piston is a surprisingly small 4. 2 cm. The elevator begins to move upward, accelerating at 0. 80 m/s².
Pressure = Force/area
Pressure = mass. acceleration/area
Pressure = 2000*9.8/0.005542
Pressure = 288704 pascal
The absolute pressure in the piston is 288704 pascal.
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This painting represents the milky way galaxy as it might appear from a distance. Identify the indicated features.
The indicated features of how the painting represents the milky way galaxy include the following:
Spiral armBulgeDiskWhat is Milky way?This is the galaxy which comprises of our solar system and has a milky appearance when it's viewed from the earth.
The painting represented it as a result of the spiral arm and other features which are listed above.
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a force of 10N is applied to a box and moves it 3 meters in 5 seconds. how much power was used?
Answer:
Explanation:
Work = Force x Displacement
Work = 10 x 3
Work = 30
Power = Work / Elapsed Time
Power = 30 / 5
Power = 6
Many asteroids are found between Mars and which other celestial body?
Jupiter
the sun
the moon
Earth
Answer:
the answer is Jupiter....
Main Asteroid Belt: The majority of known asteroids orbit within the asteroid belt between Mars and Jupiter, generally with not very elongated orbits. The belt is estimated to contain between 1.1 and 1.9 million asteroids larger than 1 kilometer (0.6 miles) in diameter, and millions of smaller ones
Answer:
The answer is Jupiter.
Explanation:
Newton's law of universal gravitation is described by this equation.
Gm m2
d2
The students want to know what would happen to the force exerted on
Earth from the Sun if the distance between Earth and the Sun
increased.
Complete these tasks:
• Explain how the force would change.
• By using G, m, or d, identify the independent variable in the
equation that causes this change.
Enter your answer in the box provided.
The force attracting a piont mass to the center of the earth is affected by the mass and the separating distance.
Gravitational ForceThe law of universal gravitation states that a point mass is attracted to other points mass, the effect on the force is directly proportional to the product of the mass and inversely proportional to the separating distance.
The expression of the Gravitational Force is given as
[tex]F = \frac{Gm1 m2 }{d^{2} }[/tex]
F = force
G = gravitational constant
m1 = mass of object 1
m2 = mass of object 2
d = distance between centers of the masses
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To draw Lewis dot structure for the noble gas Ne that has an atomic number of 10, we should,
a
Write the Symbol and draw 10 dots around it.
b
Write the Symbol and draw 8 dots around it.
c
Write the Symbol and draw 2 dots around it.
d
Draw two shells with 2 electrons on the first shell and 8 on the second shell
Answer:
D) Draw two shells with 2 electrons on the first shell and 8 on the second shell.
Explanation:
There are 10 electrons, so you will need 10 shells. Electrons form octets, so there should be 8 in one and two left over in the other
A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at its bottom, the period of oscillation will.
Answer:
The period wlll decrease - it will swing faster
The period of a simple pendulum is just
P = 2 π √(L / g)
However, with a compound pendulum one must also consider the moment of inertia about the center of mass at distance L.
As water drains from the sphere its moment of inertia about its point of suspension will decrease and the pendulum will swing faster
Technically P = 2 π √I0 / M g L)
where I0 = M L^2 + Icm Icm is moment of inertia about the center of mass - if Icm = zero then P = 2 π √(L / g) the simple pendulum
What effect does dropping the sandbag out of the cart at the equilibrium position have on the amplitude of your oscillation?.
Answer:
It has no effect on the amplitude.
Explanation:
When the sandbag is dropped, then the cart is at its maximum speed. Dropping the sand bag does not affect the speed instantly, this is because the energy remains within the system after the bag as been dropped. The cart will always return to its equilibrium point with the same amount of kinetic energy, as a result the same maximum speed is maintained.
A galaxy with a lot of dark matter would have a high mass-to-light ratio compared to the Sun. True False
Yes, a galaxy with a lot of dark matter would have a high mass-to-light ratio compared to the Sun.
Contribution of dark matter in mass to light ratio?This largely invisible matter such as dark matter adds to the mass of the galaxy while it has no contribution in its luminosity which increases the mass-to-light ratio. If dark invisible matter is present in a galaxy, its mass-to-light ratio can be as high.
So we can conclude that the statement is true.
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1 What do the characteristics of electromagnetic radiation include?
A. characteristics of particles only
B. characteristics of waves only
C. characteristics of both waves and particles
D. characteristics of neither waves nor particles
2 Which equation correctly relates the energy of electromagnetic radiation to its frequency?
A. E=h/v
B. E=hv
C. E=v
D. E=h
3 What causes electrons in atoms to emit energy after absorbing it?
A. being ripped off their atoms
B. returning to their ground energy states
C. losing mass
D. becoming electromagnetic radiation
4 What observation led scientists to postulate the existence of photons?(1 point)
A. electrons in atoms emitting energy only in certain amounts
B. seeing photons through powerful microscopes
C. discovering that electrons can have varying amounts of energy
D. electrons in atoms emitting energy across the electromagnetic spectrum
Answer:
1. characteristics of both waves and particles
2. E = hv
3. Returning to their ground energy states
4. Electrons in atoms emitting energy only in certain amounts
Explanation:
took the connexus physics emission spectra quick check
The characteristics of electromagnetic radiation include the characteristics of both waves and particles. So, option D.
The expression that relates the energy of electromagnetic radiation to its frequency is given by E = hνSo, option B.
The electrons in atoms emit energy after absorbing by returning to their ground energy states. So, option B.
The observation that led scientists to postulate the existence of photons is that electrons in atoms emitting energy only in certain amounts. So, option A.
When an atom absorbs energy, electromagnetic radiation is produced. One or more electrons move to a different location within the atom as a result of the energy that was absorbed.
An electromagnetic wave is created as the electron moves back to its initial position.
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A ball is moving at 10m / s and has a momentum of 200kgm /s What is the ball's mass?
Answer:
20 kg
Explanation:
Momentum = mv =
200 = m * 10
m = 20 kg
Huda is 16 years old, but she looks 12. A lot of her friends already look like adults. She asks her doctor about biologically becoming an adult. What is the doctor's BEST response for Huda?
The Doctor's best response to her will be that individuals develop at different rates and she should be unbothered.
What is Development?This is defined as a specified state of advancement or growth and we individuals mature at different rates.
This is because various factors such as genetic and the environment influence maturity rate which is why Huda shouldn't be bothered.
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Answer: When you reach full adult size and become sexually mature, you are biologically an adult.
Explanation: Just took the test