Aheavy ball is hung from the ceiling by a steel wire. the instructor pulls the ball back and stands against the wall with the ball against his chin. to avoid injury the instructor is supposed to release the ball without pushing it (fig. 6–33). why?

What accounts for an increase in the temperature of a gas that is kept at constant volume? a. energy has been removed as heat from the gas. b. energy has been added as heat to the gas. c. energy has been removed as work done by the gas. d. energy has been added as work done by the gas.

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?

Hello i am required to make a physics experiment plus powerpoint presentation. i want to see your suggestions about simple topics with examples of how to talk about it in the presentation. note: any incomplete answer will be reported.