Aboulder that is resting on the top of a cliff slips over the edge and accelerates towards the ground. as the rock falls, the amount of kinetic energy
a) increases.
b) decreases.
c) stays the same.
d) increases then decreases.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

The mini-refrigerator fire was most likely caused by what type of wiring?

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy