A book is pushed across a horizontal rough table at a steady speed for a certain distance. When apply the following energy principle to this question, assuming the system is book+earth+table, which of the energy term is positive? Select all apply. ΔK + ΔUg + ΔUsp + ΔEth + ΔEch = Wexternal     ΔK     ΔUg     ΔUsp     ΔEth     ΔEch     Wexternal     none of the above

You throw a 24.0 NN rock into the air from ground level and observe that, when it is 14.0 mm high, it is traveling upward at 16.0 m/sm/s.   Part A: Use the work-energy principle to find the rock's speed just as it left the ground. Part B: Use the work-energy principle to find the maximum height the rock will reach.

1. A 10 kg at a mail facility slides down a 10-meter sorting chute. The height of the chute is 2 meters. The speed of the package at the top of the chute is 5 m/s, and it is moving at 3 m/s when it reaches the bottom. Let g = 10 m/s². Write the relations you use symbolically before substituting in numbers. a. What is the change in the kinetic energy of the package when it slides down the chute? Be careful with the sign (+/-)! 2m Normal Force: M e. What is the magnitude of the frictional force? b. Determine whether the work done by gravity and the normal force on the package is positive, negative, or zero. Hint: Draw each force vector and displacement vector with their tails together. Think about angle between the force and displacement. Gravity: 20 m 9.8 m What is the work done by gravity as the package slides down the chute? Be careful with the sign (+/-) d. How much mechanical energy became thermal energy during this process, i.e., what is AEtherm? Use the work- energy relation with…

S 17 g My sister Sara is pulling a box along a horizontal surface with the force F inclined at an angle 0 with the horizontal. The box moves a distance d. F 1 say that the work done by the force of gravity is equal to zero. O True O False OL MA