An unwary football player collides with a padded goalpost while running at a velocity of 8.50 m/s and comes to a full stop after compressing the padding and his body 0.210 m. (a)
What is his deceleration in m/s2? (Enter the magnitude.)
m/s2
(b)
How long in seconds does the collision last?

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?