A 2kg book is moved from a shelf that is 2m off the ground to a shelf that is 1.5m off the ground, what is it's change in gravitational potential energy

When a block with a hole in it is heated why does not the material around the hole expand into the hole and make it small

Why does water break apart rock when it freezes? A. because it expands B. because it contracts C. because it evaporates D. because it dissolves rock

Prove that, 1+sin t/cos t = cos t/1-sin t

At 400 K, a volume of gas has a pressure of 0.40 atmospheres. What is the pressure of this gas at 273 K?

The dimensions of a rectangular monitor screen are such that its length is 3 in. more than its width. If the length were doubled and if the width were decreased by 1 in., the area would be increased by 176 in squared.

How many kilometers are in 14,000 centimeters

In later years, motors improved and could be run directly from a 60 Hz power supply. As a result, 25 Hz power systems shrank and disappeared.

Acceleration increases over time once a force is applied to the object. Given a force of 10.0 Newtons, which mass will have the greatest acceleration?

The transfer of energy between two objects by electromagnetic waves is called

What is the unit of k (spring constant) in SI system?