1. An object is pushed with a force of 400 N for 20 meters; what is the work done on the object? Solve using W=F*d (page 107) 2. A truck has a mass of 3,000 kg and is going 3 m/s. What is the kinetic energy of the truck? Solve using KE = (1/2)mv2 (page 116)

3. A book has a mass of 6 kg and is 15 m above the ground; what is its potential energy? Solve using GPE = mgh (g = 9.81 m/s^2; page 118)

4. A power mower does 120,000 J of work in 1200 s. What power does it develop? Solve using P = E/t (page 126)​

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

The amount of heat required to change liquid water to vapor at its boiling temperature is 2256 kj/kg. the amount of heat required to change liquid mercury to its vapor state at its boiling temperature is 295 kj/kg. one kg of each substance is currently at its boiling point. how will the amount of thermal energy required to change each substance from a liquid to a gas differ?

Acircuit contain a 5-ohm,a3-ohm,and an 8-ohm resistor in series. what is the total resistance of the circuit