Two billiard balls have velocities of 4.0 m/s and –1.0 m/s when they meet in an elastic head-on collision. What is the final velocity of the first ball after collision?
a. +1.0 m/s
b. –1.0 m/s
c. –3.0 m/s
d. +5.0 m/s
e. +4.0 m/s
b
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When material expanding away from a star in a binary system leaves a star's Roche lobe,
a. the material will start to fall back toward the star. b. all of the material will accrete on to the companion. c. the material is no longer gravitationally bound to that star. d. the material will increase in temperature an eventually undergo thermonuclear fusion. e. c and d.
The interior of Earth is very hot because of ________.
A. the radioactive decay of elements B. internal combustion C. oxidation D. fusion reactions
Ilona and Olivia observe a virtual image formed by an object placed a distance 
in front of a convex lens of focal length f. They argue about where to place a concave lens of focal length ?f to have a virtual image at the same location relative to the lens that they had with the convex lens. Ilona says that the object should also be placed a distance 
/> in front of the concave lens. Olivia says that this won't work. Which one, if either, is correct, and why? A.
B.
C.
D.
, then d0 was d0 = ?.E.
Describe the phenomenon known as refraction
What will be an ideal response?