two simple pendulums of lengths 1.44 m and 1.21 m start swinging at the same time from a location. after how much time , they will be (a) out of the phase and (b) again? take g=10ms

Suppose you use a machine that gives you a mechanical advantage of 2 to achieve an output force of 30newtons what must the input force be

It takes a lot of energy to get the temperature of water to increase and eventually boil because water has a high heat.

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?