Explain why the books will not slide down the ramps at the same speed.

a. the sandpaper ramp will have more friction than the wood ramp.

b. the book on the wood ramp has more gravity pulling on it.

c. the wood ramp will have more friction then the sandpaper ramp.

d. the sandpaper ramp is higher than the wood ramp.

explain why you choose the answer you did.

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

How does the formation of intrusive and extrusive igneous rocks differ?