What is the difference between the charges on a balloon rubbed in your hair and a glass rod rubbed with silk? why?

How does beam spreading affect the temperature on earth and the seasons

Why will dropping an iron magnet on a concrete sidewalk make it a weaker magnet?

An astronaut is a short distance away from her space station without a tether rope. She has a large wrench. What should she do with the wrench to move toward the space station? a. Throw it directly toward the space station. b.

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.)

What acceleration formula?

Describe and apply Newton's Three Laws

If you do 1000j of work on a system and remove 500j of heat from it, what is the change in its internal energy

Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 4.5 m long, its mass is 0.42 kg, and the force exerted on it by the children is 71 N.

An object will only change its motion if a force is directly applied to it. is this a true statement?

Janice has just measured the density of an object. Which value is possible? (Density: D = )