When a person bends an arm a different muscle is used to bring it back to the original position. why can't the same muscle be used to both bend and unbend the arm?

The particles in the atom that account for most of the mass of the atom are protons and

Sandra moves 14 m in 2 minutes. What is Sandra's average velocity (in m/s) ? A. 1.98 m/s B. 0.23 m/s C. 0.78 m/s D. 2.56 m/s

How are oceans connected to all bodies of water

Explain why a person with nerve damage could lose the ability to control some skeletal muscles?

What is a magnetosphere? a. the layer of a planet in which its magnetic field is generated b. a region of space around a planet in which the planet's magnetic field can trap charged particles c. the uppermost layer of any planetary atmosphere d.

The part of a longitudinal wave that is least dense is called a (n) rarefaction refraction contraction compression

if 100 grams is equal to 1 newton of force, and the water displaced by an object would have a mass of 40 grams, what is its buoyant force on that object?

A charge if 2 nC is placed 10cm to the right of a conducting sphere with a diameter of 2 cm. A charge of 5 nC is placed 10 nC to the left of the same sphere. determine the charge at the center of the sphere.

1) How is chemical energy transformed into potential energy?

A double-paned window has two glass panes separated by a layer of air. Why is air, rather than glass, used to fill this space?