Which of the following is a scalar quantity?

a. 35m
b. 20 m to the right
c. 30 m to the north
d. all of the above

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.