Q1:

A45.3-g golf ball is driven from the tee with an initial speed of 51.2 m/s and rises to a height of 33.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.30 m below its highest point? The drawing shows a skateboarder moving at 6.60 m/s along a horizontal section of a track that is slanted upward by 6 = 48.0 above the horizontal at its end, which is 0.640 m above the ground. When she leaves the track, she follows the characteristic path of projectile motion. Ignoring friction and air resistance, nd the maximum height H to which she rises above the end of the track. A 69.0-kg person jumps from rest off a 2.30-m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.10 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is non-conservative. Number l Units 4) A person is making homemade ice cream. She exerts a force of magnitude 27 N on the free end of the crank handle on the ice- cream maker, and this end moves on a circular path of radius 0.20 m. The force is always applied parallel to the motion of the handle. If the handle is turned once every 1.4 5, what is the average power being expended? Number I Units A 1970-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 33.7 m/s. Going up a hill, the car's engine needs to produce 56.0 hp more power to sustain the constant velocity than it does going down the same hill. At what angle is the hill inclined above the horizontal? Number I Units 4}