Physics questions

1. How far (in meters) must a 600 kg pile driver fall, if it is to do 14000 J of work?

2. A spring whose spring constant is 150 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.600 kg ball when released?

3. A 550 N crate rests on the floor. How much work in joules is required to move it at constant speed 4.0 m along the floor, against a friction force of 140 N?

4. What is the minimum work in joules needed to push a 1710 kg car 74.0 m up a 12.5 degree incline? (Ignore friction.)

5. How much work in joules must be done to stop a 3000 kg car traveling at 150 km/hr?

6. A 1620 kg car rolling on a horizontal surface has a speed of 70 km/hr when it strikes a horizontal coiled spring and is brought to rest in a distance of 5.5 m. What is the spring constant (in N/m) of the spring? (Ignore nonconservative forces such as friction.)

7. A spring has a spring constant "k" of 160 N/m. How much must this spring be compressed (in meters) to store 70 J of energy?

8. Tarzan is running at a top speed of 5.0 m/s and grabs a vine hanging vertically from a tall tree in the jungle. How high (in meters) can he swing upward?

9. An object slides down a frictionless 33 degree incline whose vertical height is 87.0 cm. How fast is it going in meters/second when it reaches the bottom?

10. A 33 kg child descends a slide 7.8 m high and reaches the bottom with a speed of 3.30 m/s. How much thermal energy (in joules) due to friction was generated in this process?

11. Two railroad cars, each of mass 6800 kg and traveling 80.0 km/hr, collide head-on and come to rest. How much thermal energy in joules is produced in this collision?
Asked Jul 07, 2010
One more question:

12. Two young people have 11 physics questions to answer. One gets out the book and works through the problems. The other gets online and asks someone else to work them for him. Which student will make out better in life?
Answered Jul 08, 2010
its pretty bad when kids get online to get someone else to do their homework. the answer to your question is the one who works through the problems.
I agree. It's difficult for some young people to understand that ten years from now the grade will not make any difference, it's developing the skill that counts. When they get a job, their boss isn't going to wait while they get on EHelp to find an answer.
Rob Jul 08, 2010
exactly most kids anymore want to take the easy way out and not do the work. I just graduated from high school and I never did any of that. I always did my own work. it makes me sad that kids have to resort to things like this.
Hey, don't feel bad. You'll be their boss some day. :-)
Rob Jul 13, 2010
lol yeah I know. ill make them my eternal slaves for years of torture

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