8) As part of a circus act, Dimitri, a 136 kg strongman, catches cannonballs fired at his chest. The 34 kg cannonball is fired toward Dimitri with a speed of 32 km/h.
What speed does the combination of Dimitri and the cannonball tumble backward once the cannonball is
caught?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Erosion of the beach is normally a slow process. however, in certain situations, large chunks of shore may wash out to sea. what could cause this to happen?

Select the three ways that the parallel-plate capacitor differs from a car battery.