Which of the following correctly describes the state of matter of one of the samples? a. d is a liquid because it retains its shape b. d is a solid because it retains its shape. c. c is a liquid because it has a definite volume. d. c is a solid because it has an indefinite volume.

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.

Based on this activity, is kinetic energy always transformed into potential energy?