I'm suppose to explain how changing the charge of objects affects the force being deteced. When I change the charge the newtons say 0.0 each time. If you guys can help me i would appreciate it cause this is due tmrw​. (I can only add one photo)

Asimply means that over time there was some sort of change.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)