# science

posted by .

Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work.
You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal mass (1,000 kg each) were involved in a rear-end accident at a stop sign. Here is what you know:

Car 1 approached the intersection from the top of a 25-meter hill.
Car 2 was on a flat stretch of road directly in front of Car 1.
At the bottom of the hill, Car 1 was going 20 m/s; Car 2 was going 30 m/s before it stopped at the stop sign.
There were no skid marks left by Car 2. The collision occurred at the stop sign, where Car 2 had stopped.
After the collision, both cars were moving together in the same direction at 10 m/s before slowly rolling to a stop.
You must now push Car 2, using 800 N of force, 10 meters off to the side of the road so no one else gets hurt.
1. What was the potential energy of Car 1 at the top of the hill? (3 points)

2. What was the kinetic energy of each car before braking? (4 points)

3. A. How much energy did Car 1 lose from the top to the bottom of the hill? (3 points)

B. Where do you suppose that energy went? (2 points)

4. How much work was done to bring Car 2 to a stop? (4 points)

5. If Car 2 came to a stop in 15 seconds, how much power (in watts) did it take to stop Car 2 at the stop sign by applying force to the brakes? (3 points)

6. What is the final combined momentum of the cars right after the accident? (6 points)

7. Assuming that there are no other nonconservative forces involved, what impulse was given to each car during the collision? (6 points)
A. Car 1 (3 points)

B. Car 2 (3 points)

8. How much energy did Car 1 lose in the collision? (3 points)

9. How much energy did Car 2 gain in the collision? (3 points)

10. Which of the two laws covered in this unit - Law of Conservation of Momentum or Law of Conservation of Energy - is obeyed in this problem? Explain your reasoning. (5 points)

11. How much work did it take to move Car 2 off to the side of the road? (3 points)

12. If it took you 40 seconds to move Car 2 off the road, how much power did you expend? (3 points)

13. Which simple machine does a car have that helped you move Car 2? Explain. (2 points)

• science -

If it took you 40 seconds to move Car 2 off the road, how much power did you expend?

• science -

7. Assuming that there are no other nonconservative forces involved, what impulse was given to each car during the collision? (6 points) A. Car 1 (3 points)

• science -

hahlhalha;

• science -

1- r45

## Similar Questions

1. ### Physics Work and Energy, Momentum

Let g be the acceleration due to gravity at the surface of a planet of radius R. Which of the following is a dimensionally correct formula for the minimum kinetic energy K that a projectile of mass m must have at the planet's surface …
2. ### Physics Homework

I have a few questions that I don't understand and would like to get checked, please?

4. ### English

Can you check if the following statements and questions are correct?
5. ### COMPOSITION AND COMMUNICATION I

Write a 150- to 200-word paragraph to explain how purpose, audience, tone, and content would impact the following topic: What do you hope to accomplish COM 155?
6. ### Heeeeeeeelp

Read the following instructions in order to complete this assignment and review the example of how to complete the math required for this assignment: Use the properties of real numbers to simplify the following expressions: 2a(a – …
7. ### Criminal law

1. An investigator conducting a crime scene search at the scene of a violent crime has certain responsibilities and procedures to follow related to evidence collection. Of the following steps, which one is not required of the on-scene …
8. ### Physics

Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work. You are a traffic accident investigator. You have arrived at …
9. ### Physics

Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work. You are a traffic accident investigator. You have arrived at …
10. ### chem

Use the balanced equation, N2 + O2 --> 2NO, to answer the following questions... A) How many grams of NO are formed from 10.0g of N2?

More Similar Questions