Water vapor sometimes condenses to form water droplets called dew. when this occurs, what type of change is it?
a. physical only
b. chemical only
c. physical and chemical

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?