When solving for unknown positions, time, velocities, and acceleration for objects that are undergoing an acceleration, what must be true in order to use the derived formulas?
The acceleration must be

changing
negative
zero
constant

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!