a 275-kilogram object starts from rest and accelerates on level ground up to a speed of

41 meters per second over 49.3 meters. it continues at that speed for another 15

meters. at the end of the 15 meters, the object is launched forward at a 37° angle.

a. how much time does it take for the object to reach its final velocity?

b. how much force did the object apply in order to reach that final speed?

c. what are the maximum range and height of the object when it is launched?

d. at what angle would the object have to be launched to reach a height of 50

meters above the ground at the same initial velocity?

e. describe a realistic scenario in which this might happen.

Conventional hot-water heaters consist of a tank of water maintained at a fixed temperature. the hot water is to be used when needed. the drawback is that energy is wasted because the tank loses heat when it is not in use, and you can run out of hot water if you use too much. some utility companies are encouraging the use of on-demand water heaters (also known as flash heaters), which consist of heating units to heat the water as you use it. no water tank is involved, so no heat is wasted. a typical household shower flow rate is 2.50 gal/min (9.46 l/min ) with the tap water being heated from 51.0 ˚f (10.6 ˚c) to 120 ˚f (48.9 ˚c) by the on-demand heater.what rate of heat input (either electrical of from gas) is required to operate such a unit, assuming that all the heat goes into the water?