A body with a weight of 258 lb changes it velocity from 25 ft/s to 146ft/s. Calculate the change in its kinetic energy

determine the work done on a 5.6kg ball attached to a cable and spun in a horizontal circle at a constant speed. The length of the cable is 0.2m.

A cargo truck weighing 2,700 kg accelerates from 3.5 m / s to 6.2 m / s in 12.0 seconds applying a constant force. What change does the momentum experience? b. What is the intensity of the force exerted?

A helicopter with a mass of 10,000 kg takes off straight up at t=0. The thrust of the engine is defined given as a function of time: FT= 95 0.18t- (kN). Where t is in units of seconds. How fast is it rising and what is its elevation at t=4s?

The heat-transfer rate to the surroundings from a person at rest is about 100 W. Suppose the ventilation system fails in an auditorium containing 2000 people. Assume there is no heat transfer through the auditorium walls. A. Determine the increase in internal energy of the air in the auditorium during the first 20 min after the ventilation system fails. Express your result in MJ. B. Considering the auditorium and all of the people as a system, determine the increase in internal energy (MJ) of the system. How do you explain the fact that the temperature of the air increases?

A body weighing 558 kg accelerates from 55 ft/s to 146 ft/s. Calculate the change in kinetic energy of the object.

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A pump is supplying water at the rate of 4ft^3/s it lifts water to a height of 15ft. Determinte the power that the water is being delivered to by the pump  (hp). If the pump has 80% efficiency , find the power that needs to be supplied to the pump (hp)