A billiard ball moving at 4 m/s strikes a smooth horizontal plane at an angle of 35° as shown in Fig. If the coefficient of restitution is 0.6, what is the velocity with which the ball rebounds?

During terrible weather at a ski-flying world championship, a ski jumper tried to adjust for bad conditions midway down the ramp but completely lost control and tumbled wildly off the side at its bottom into a scattering crowd. The 73-kg jumper left the ramp about 45 m lower than his starting position. If the ski jumper had simply fallen straight down 45-m rather than skiing down a ramp, would his kinetic energy increase?

(a) A iron block with a mass of 6.9 kg initially slides over a rough horizontal surface with a speed of 9.0 m/s. Friction slows the block to rest. While slowing to rest, 85.0% of the kinetic energy of the block is absorbed by the block itself as internal energy. What is the temperature increase of the block? (Enter your answer in degrees Celsius.)  ?°C (b) What happens to the remaining energy?  It is absorbed by the horizontal surface on which the block slides.  It vanishes from the universe.      It becomes chemical energy.  It is so minute that it doesn't factor into the equation.

A child puts a 0.005 kg spitball in a straw and blows into the end so that the net internal pressure against the spitball is 4000 N/m2. The effective cross-sectional area of the spitball is 0.000075 m². After 0.2 s, how fast is the spitball traveling?

Small steel balls, each with a mass of 150 g, enter the semicircular trough (Radius =0.92 m) in the vertical plane with a horizontal velocity of VA=7.9 m/s at A. Friction is negligible. UB B VA A velocity at C (m/s) a. 6.66 о Б.7.99 c. 5.33 d. 9.33 e. 2.66 normal reaction at C velocity at B (m/s) О а. 6.16 b. 5.13 C. 4.11 d. 3.08 е. 2.05 O O