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

Question

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.)

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.)

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?

Explanation / Answer

2) k = 150 N/m, x = 0.800 m, m = 0.600 kg, find v energy conservation, kx^2/2 = mv^2/2 so v = x*sqrt(k/m) = 12.6 m/s It is the Cramster's policy that one question in one post.

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