Which of the following is an example of a physical change?

A. water freezing

B. a cake baking

C. a match burning

D. fireworks exploding

Why is carbon monoxide such as dangerous form of indoor air pollution?

A hydrogen atom contains a single electron that moves in a circular orbit about a single proton. Assume the proton is stationary, and the electron has a speed of 7.5 105 m/s.

What two temperature scales are commonly used in the United States

An archer pulls her bowstring back 0.396 m by exerting a force that increases uniformly from zero to 237 N. (a) What is the equivalent spring constant of the bow? 598.48 Correct: Your answer is correct.

The Biot-Savart force law does not apply if the velocity is parallel to the field direction. a. True b. False

The kinetic energy of a sliding block came from the: kinetic energy of the string. kinetic energy of the board. gravitational potential energy of the block. gravitational potential energy of the mass on the hook.

A less-massive object is moving in the same direction as a more-massive object, but with a higher speed. They experience an inelastic collision. Describe the speed of the more-massive object after the collision.

At a given location in space, the magnetic field in an electromagnetic wave is increasing. How is the electric field changing at that same location? a. The electric field is increasing. b. The electric field is decreasing. c.

What determines the properties of an object

If you hit a wall, will the force that you exert on the wall be greater than, or less than, or equal to the force that the wall exerts on you. Explain your answer.