Why are satellites placed into orbit at least 150 km above Earth's surface?

to avoid air resistance

to match Earth's curvature

to create inertia

to increase friction

Suppose you are walking home after school. The distance from school to your home is five kilometers. On foot, you can get home in 25 minutes. However, if you rode a bicycle, you could get home in 10 minutes. a.

A particle of mass 5kg is pulled along a rough horizontal surface by a string which is inclined at 60° to the horizontal.

Describe what it means to view something from a frame of reference. Give an example to illustrate your explanation.

Astronomers use radio waves to learn about the universe. Radio waves travel light-years through space before reaching Earth. Radio waves must be which type of wave

What is a strong, short-lived magnet created by a looped electrical current.

A solid sphere of radius R has a total charge Q distributed evenly throughout its volume. What fraction of the total charge is located inside a radius R/2?

What is Nothing. (sorry i have been wondering this for a very long time)

What is the speed of a bobsled whose distance-time graph indicates that it traveled 123m in 28s?

Eric has a mass of 80 kgkg. He is standing on a scale in an elevator that is accelerating downward at 1.7 m/s2m/s2. What is the approximate reading on the scale?

Without the force of friction, people would not be able to walk.