What is the major source of energy for humans

Why is the mechanical advantage of a single fixed pulley is always 1?

True or false distance is the magnitude of average velocity

As the temperature increases the number of effective collisions between reacting particles in a chemical reaction A. initially increase, them decreases B. Decreases C. Initially decreases, then increase D. Increases only

Contrast elastic potential energy and chemical potential energy

What are the components of earths life support system

Which condition describes an object having terminal velocity? a. gravity > air resistance b. gravity < air resistance c. gravity = air resistance

All objects that have mass have gravity, and gravity pulls objects toward each other. A pencil has mass, and so does your hand. Yet a pencil drops to the floor when you let go of it. Why doesn't the pencil stick to your hand instead?

The radius of a car wheel is 3 inches. how far will the car travel in 10 revolutions of the wheel?

What happens to a muscle when you exercise it?

A certain rain cloud at an altitude of 1.80 km contains 3.20 107 kg of water vapor. How long would it take for a 2.90-kW pump to raise the amount of water from Earth's surface to the cloud's position?