The change in momentum of an object is equal to the
A) force acting on it.
B) change in its velocity.
C) object's mass times the force acting on it.
D) impulse that acts on it.
E) all of the above
Answer: D
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In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle ? relative to the direction of its initial velocity and body 2 at angle ?. The sine of the sum of ? and ?, sin(? + ?), is equal to
a. 0. b. 0.500. c. 0.707. d. 0.866. e. 1.00.
The total number of protons and neutrons in the nucleus of an tom is referred to as its
A) atomic mass number B) average atomic mass C) proton number D) atomic number
As atmospheric pressure increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)
A) It increases. B) It decreases. C) It does not change. D) It increases on warm days and decreases on cold days.
Spaceships A and B are moving in the same direction along the same straight line. Spaceship A is moving at 0.800 c relative to a stationary observer, and spaceship B is moving at 0.800 c relative to spaceship A. What does the stationary observer find for the speed of spaceship B?
A. 1.60 c B. 1.28 c C. 1.00 c D. 0.780 c E. 0.980 c