A quarter is 2.4 millimeters thick. How tall are the following stacks of quarters?

a. A stack worth 50 cents

b. A stack worth $1

c. A stack worth $5

d. A stack worth $1,000

(Give your answer in millimeters and meters.)

The displacement of a wave traveling in the positive x-direction is y (x, t) | = (3.5 cm) cos (2.7x - 92t), where x is in m and t is in s. What are the (a) frequency, (b) wavelength, and (c) speed of this wave?

A stone was dropped off a cliff and hit the ground with a speed of 96 ft/s. What is the height of the cliff? (Use 32 ft/s2 for the acceleration due to gravity.)

Which best describes the direction of heat? (a) from a substance with no thermal energy to a substance with high amounts of thermal energy (b) from a substance with less thermal energy to a substance with more thermal energy (c) from a cooler

Why does time slow down near a black hole and stop completely inside it?

What are the two most common ways to produce hydrogen gas used in fuel cells?

At the beach, describe where or when you would see wave fronts. How are wave fronts useful to surfers?

How would the moon appear from earth if the moon did not rotate?

Block B has mass 4.00 kg and sits at rest on a horizontal, frictionless surface. Block A has mass 2.00 kg and sits at rest on top of block B. The coefficient of static friction between the two blocks is 0.400.

T=2π√ (l/g) is dimensionally correct

A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?