stretching to the work done in the compressing? A spring with a spring constant

Question

stretching to the work done in the compressing? A spring with a spring constant of 238. 5 N/m is compressed by 0. 231 m. Then a steel ball bearing of mass 0. 0413 kg is put against the end of the spring, and the spring is released. What is the speed of the ball bearing right after it loses contact with the spring? (The ball bearing will come off the spring exactly as the spring returns to its equilibrium position. Assume that the mass of the spring can be neglected. ) A horse draws a sled horizontally across a snow covered field The coefficient of friction between the sled and the snow is 1. 195, and the mass of the sled, including the load, is 202. 3 kg. If the horse moves the sled at a constant speed of 1. 785 m/s, what is the power needed to accomplish this? A horse draws a sled horizontally on snow at constant speed. The horse can produce a power of 1. 060 hp. The coefficient of friction between the sled and the snow is 0. 115, and the mass of the sled, including the load is 204. 7 kg. What is the speed with which the sled moves across the snow? While a boat is being towed at a speed of 12 m/s, the tension in the towline is 6. 0 kN. What is the power supplied to the boat through the towline? A car of mass 1214. 5 kg is moving at a speed of 62. 5 mph when it misses a curve in the road and hits a bridge piling. If the car comes to rest in 0. 236 s, how mu ch average power (in watts) is expended in this interval?

Explanation / Answer

f =mg = .195 * 202.3 * 9.81 = 387 N

387 N * 1.785m = 691 W

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