PHYSICS HIGH SCHOOL

In a physics experiment, two equal-mass carts roll towards each other on a level, low-friction track. One cart rolls rightward at 2 m/s and the other cart rolls leftward at 1 m/s. After the carts collide, they couple (attach together) and roll together with a speed of __________. Ignore resistive forces.a. 0.5 m/sb. 0.33 m/s
c. 0.67 m/s
d. 1.0 m/s
e. none of these

Answers

Answer 1
Answer:

Answer:

The correct answer is option a.

Explanation:

Conservation of momentum :

m_1u_1+m_2u_2=m_1v_1+m_1v_2

Where :

m_1, m_2 = masses of object collided

u_1,u_2 = initial velocity before collision

v_1,v_2 = final velocity after collision

We have :

Two equal-mass carts roll towards each other.

m_1=m_2=M

Initial velocity of m_1=u_1=2 m/s

Initial velocity of m_2=u_2=-1 m/s (opposite direction)

Final velocity of m_1=v_1=v (same direction )

Final velocity of m_2=v_2=v  (same direction)

M* 2 m/s+M(-1 m/s)=Mv+Mv

1 m/s=2v

v = 0.5 m/s

rg135

The speed of the carts after their collision is 0.5 m/s.

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Kinetic energy is dependent on which of the following?

Answers

mass is always a constant for both kinetic and potential energy..no matter what situation any object is the mass doesnt change..velocity is always the factor that kinetic energy changes with..the lower the velocity the lower the knetic energy is ke=1/2 mv^2 they are directly related..when velocity= to zero then ke=0 however if there was no mass then that means there is no object which means kinetic energy is not present either..but usally its all about the velocity

PLEASEEE HELP, thank you :)

Answers

Answer:

The answer is B.

Explanation:

Given that the current (Ampere) in a series circuit is same so we can ignore it. We can assume that the total voltage is 60V and all the 3 resistance are different, 20Ω, 40Ω and 60Ω. So first, we have to find the total resistance by adding :

Total resistance = 20Ω + 40Ω + 60Ω

=120Ω

Next, we have to find out that 1Ω is equal to how many voltage by dividing :

120Ω = 60V

1Ω = 60V ÷ 120

1Ω=0.5V

Lastly, we have to calculate the voltage at R1 so we have to multiply by 20 (R1) :

1Ω = 0.5V

20Ω = 0.5V × 20

20Ω = 10V

Consider these scenarios. A pink box with containing the words Scenario 2 You are about 7 meters away from a metal bar that is struck with a drumstick. The sounds travels through the air to your ear. In which of these scenarios would the sound of the drumstick hitting the metal bar get to you in the least amount of time? Explain your answer.

Answers

Answer:

Scenario 1 will cause the sound of the drumstick hitting the metal bar to reach your ears in the least amount of time.

Explanation:

The sound wave will travel faster in the metal bar than through the air because the speed of sound waves in solids is faster than it is in gases.

Answer:

Scenario 1 will cause the sound of the drumstick hitting the metal bar to reach your ears in the least amount of time.

Explanation:

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A metal box, attached to a small parachute, is dropped from a helicopter. explain in terms of the forces acting; why:(i) its velocity increased immediately after being dropped
(ii) it reached a uniform velocity after a short time

Answers

(i) because there's gravity force pulling it downwards. 

(ii) because the force on the metal box is gone (either it has landed on the ground or something else happened) that means that the metal box is no longer moving but it has constant velocity/uniform velocity. 

I'm sorry if it's wrong but that's how I see it 

Answer:

1

Explanation:

Which factors are used the calculate the kinetic energy of an object? Check all that apply. gravity velocity volume mass height

Answers

The factors that are included in the calculation of the kinetic energy of an object would be the velocity and its mass. The kinetic energy's formula is half of the product of the mass and the velocity that is squared. The volume, height, and gravity are not included.
Kinetic energy = (1/2) (the object's mass) (its speed or velocity)²  .

No other quantities are involved.

if a 1000 kg car is sent toward a cement wall with a speed of 14m/s and car stops in .08 seconds. What's the average force exerted on the car/

Answers

Answer:175000N

Explanation:f=m(v-u)/t

F=1000(14-0)/0.08

F=(1000×14)/0.08

F=14000/0.08

F=175000N
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