Displacement divided by time gives
a. average acceleration.
b. average velocity.
c. average speed.
d. average distance.
b
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When a vapor condenses into a liquid, its temperature
A) insufficient information, cannot answer B) rises. C) stays the same. D) falls.
Stars in the same constellation
a. probably formed at the same time. b. must be part of the same cluster of stars in space. c. must have been discovered at about the same time at the same location in space. d. may actually be very different distances away from the observer and from each other.
Why are Saturn's rings so thin?
A) They are attached to Saturn's very thin equator. B) The "gap" moons shepherd the particles and maintain its thin profile. C) Any particle in the ring with an orbital tilt would collide with other ring particles. D) Solar radiation pressure keeps particles pressed into the rings. E) They formed from a flat sheet of material that broke apart.
In a colliding-beam experiment, protons moving at 0.800 c in opposite directions strike one another. What is the speed of the incoming proton as viewed by the proton about to be hit?
A. 1.60 c B. 0.00 C. 0.640 c D. 0.976 c E. 0.960 c