A ball was positioned in the middle of a smooth ramp and allowed to roll downward. How does the total mechanical energy of the system change as
the ball rolls down the ramp? Assume that there is no friction.

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

What do we mean by the event horizon of a black hole?