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)​

Which of the following would not be taken into consideration when describing the quality of a sound

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)