What happens to a bar of metal when its heated?

If pie trays are stacked on top of a Van de Graaff they will fly into the air one after another. Why does this happen?

If vector A ⃗ has components A x and A y and makes an angle θ with the + x axis, then

A force of 100 N is applied to a crate at an angle of 60° to the horizontal surface. The force causes the crate to move 2 m across the floor. How much work is done on the crate?

a silver ingot has a volume of 53.6 cm and weighs 500g. what is the desity in grams per cubic centimeter.

A 430 g soccer ball lying on the ground is kicked and flies off at 25 m/s. If the duration of the impact was. 01 s, what was the average force acting on the ball?

Explain why the car reaches a top speed even though the thrust Force remains constant at 3500N

4. A helicopter is flying at a height of 1.5km. If it has 50MJ of G. P. E., what is the mass of the helicopter?

Unless otherwise posted, what is the speed limit in a school zone? florida

If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position? when released, what will be it's kinetic energy if it flies past it's starting position?

The process of changing the energy of a system by means of force. Force * Diatance