The two strongest forces that protons in a nucleus exert on each other are
A) the weak nuclear and electromagnetic forces.
B) the weak nuclear and the gravitational forces.
C) the electrostatic and the gravitational forces.
D) the strong nuclear and the electrostatic forces.
D
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If the following graphs are for the same reaction, which one is most likely the one with an added catalyst?
A) a B) b C) c D) d E) All have had catalyst added.
A star that is twice the mass of our Sun would have a habitable zone that:
a) includes Mars but not the Earth b) includes Venus but not the Earth c) includes Neptune only d) includes both Venus and the Earth e) includes Mercury only
The Moon
a. revolves about Earth from west to east. b. has a day equal to 29.5 Earth days. c. has an elliptical orbit about Earth. d. all of these.
A very small round ball is located near a large solid sphere of uniform density. The force that the large sphere exerts on the ball
A) is exactly the same as it would be if all the mass of the sphere were concentrated at the center of the sphere. B) is approximately the same as it would be if all the mass of the sphere were concentrated at the center of the sphere. C) is independent of the mass of the ball. D) is independent of the mass of the sphere. E) can only be calculated using calculus.