The principle of the photoelectric effect is:

A) the electromagnetic theory of light

B) the special theory of relativity

C) the principle of superposition

D) the quantum theory of radiation

Which of these parameters is directly related to sound frequency?

Which part (s) of the electromagnetic spectrum are visible to humans?

Two carts with masses of 17.5 kg and 1.5 kg, respectively, move in opposite directions on a frictionless horizontal track with speeds of 8.0 m/s and 4.0 m/s, respectively. The carts stick together after colliding head-on.

Calculate the mechanical advantage of a block and tackle that requires a force of 20N to lift a rock that weighs 40N one meter off the ground

If you place a free electron and a free proton in the same electric field, how will the forces acting on them compare? 82. How will the accelerations of the proton and the electron in the preceding problem compare? 83.

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.

How are trade winds affected by the coriolis effect