An apple weighing 3 newtons hangs, motionless, from a tree branch. What are the forces by the environment that act on this apple?
A) There are no forces by the environment on a motionless apple.
B) The apple's weight and the apple's downward pull on the branch.
C) Only the apple's weight.
D) Only the upward lift of the branch.
E) the apple's weight and the branch's upward lift on the apple.
E
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Why do we think the inner (terrestrial) planets became denser than the outer planets?
a. As the solar nebula collapsed, gravity pulled denser materials toward the center. b. The inner part of the solar nebula was so hot that only dense metals and rocks were able to condense there. c. The rotating disk in which the planets formed flung lighter elements outward by rapid rotation.
Genetic radiation damage is:
a. another name for somatic damage. b. any radiation damage to a cell. c. radiation damage affecting reproductive cells. d. measured in roentgens.
Orbital Angular Momentum: An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. What is the magnitude of the orbital angular momentum of the atom?
A. 1.0 
B. 1.2 
C. 1.4 
D. 1.7 
E. 2.0 
How would you describe the distribution of galaxies in your Local Group?
A.) They just look randomly distributed. B.) There are the two big galaxies, and then the dwarfs seem to be clustered around them. C.) The big galaxies are together at the center and the dwarfs are in a big circle around them. D.) The dwarfs are in the center clustered together and the two big galaxies are off to the side. E.) The two larger galaxies are on one side of the group and all the dwarfs are on the other side.