Which of the following is a physical change?

A.) sawing a piece of wood.

B.) burning a piece of wood.

C.) rust forming on an iron fence.

D.) a copper roof changing color from green to red.

Why do plates move away from the mid - ocean ridges?

Which of The following has the most kinetic energy a 25-kg fish tank sitting on a table, A 50-kg Fish swimming in a fish tank, A 7,500-kg car parked on a steep hill, or a 50-kg boulder suspended from a cliff.

The shopping cart is moving forward. What force moves it forward? The force of the man pushing on the handle. The force of the wheels pushing on the floor. The force of the floor pushing on the wheels.

The Earth has a magnetic field. If you were to use a bar magnet to represent the magnet causing the magnetic field, which representation would be correct?

If body a and b are both within system can forces between them affect the acceleration of the system?

What happens to the period of a spring-cart system motion when the system is in orbit inside the international space station?

Ovens, toasters, dryers, and heat lamps are examples of inventions that convert electrical energy to thermal energy, which is a kind of kinetic energy.

Why does Alpha Centauri appear to be yellow-white?

In order to determine speed, you must know

Which of the statements best describes the relationship between the surface of an object and the amount of friction it produces? A.) The smoother the surface of an object, the more friction it will produce. B.