A metal block is sliding along an infinite, frictionless, horizontal plane. There are only two forces acting on the metal block: gravity and an upward force from the plane. Which of the following best describes the metal block's motion?

A.

The metal block will eventually slow down and stop.

B.

The upward force will accelerate the metal block forward.

C.

Gravity will accelerate the metal block downward.

D.

The metal block will move at the same speed forever

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

Which of the following is the best name for mgcl2