What is a system in science this is my last question

How much heat is givne out when 6.0g of water freezes at 0 degrees celcius the heat of fusion of water is 80.0 cal/g?

A stone falling from a cliff increases speed until it reaches constant velocity, or terminal velocity. What does the stone's motion tell you about the forces acting on the stone?

Why is there no electric field at the center of a charged spherical conductor?

Name some types of rock that have been used to construct buildings

What is the difference between a physical and a chemical equilibrium?

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