What is the potential energy of a 3gram penny atop the Empire State Building (381m)

What are the metric units for length, mass, and volume?

You need to lift up a 45-N object. Explain the strength and direction of the force used to lift the object.

A good description of magnets would be, "Magnets are A. things that carry electricity O B. things that can attract iron O C. like Earth O D. things with magnetic domains

Two gliders are on a frictionless, level air track. Both gliders are free to move. Initially, glider A moves to the right and glider B is at rest. After the collision, glider A has reversed direction and moves to the left.

The velocity of a ball as it is thrown up is 20 meters/second. It attains zero velocity after 3.5 seconds. What is the average acceleration of the ball during its upward flight?

How can eclipsing binary stars be identified? They are brighter than any single stars. They are cool red stars. They are all white dwarfs. They become dimmer at regular intervals.

Resistance or opposite to a force refers to a

In tae-kwon-do, a hand is slammed down onto a target at a speed of 10.5 m/s and comes to a stop during the 2.13 ms collision. Assume that during the impact the hand is independent of the arm and has a mass of 0.400 kg.

If you looked at the frequently spectrums of two friends saying the word dog, would they look the same or different ?

Which of the following atoms has the smallest radius? The Periodic Table