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

In which of the following kingdoms are prokaryotes found? A-plant and animal only B-EUbacteria and archae only C-protist, fungus, plant, and animal only D-Eubacteria, arachea, protist, and fungus only

Which statements define factors that contribute to the decline of Roman Empire

Where do all the elements that form planets come from

Changes in the way atoms are? together occur when compounds form

A spinning top rotates so that its edge turns at a constant speed of 0.63 m/s. If the top has a radius of 0.10 m, what is the centripetal acceleration of the edge of the top? 0.016 m/s2 0.73 m/s2 4.0 m/s2 6.3 m/s2

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.