What holds the Sun together?
A. its gravitational force
B. gas pressure.
C. electrostatic forces between ions in its interior
D. Nothing, the Sun is actually expanding very slowly.
Answer: A
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One of the primary motivating forces behind our per capita reduction in energy use in the 1980's was _____________
a. a smaller population growth b. higher oil prices c. increased nuclear power costs d. increased domestic oil discoveries
Exclusion Principle: Which one of the following is the correct electronic configuration for carbon, which has 6 electrons?
A. 1s2 2s2 2p2 B. 1s1 2p1 C. 1s1 2s2 2p1 D. 1s1 2s1 2p1 E. 1s2 2s2 2p4
Simple Pendulum: A simple pendulum and a mass oscillating on an ideal spring both have period T in an elevator at rest. If the elevator now accelerates downward uniformly at 2 m/s2, what is true about the periods of these two systems?
A. Both periods would remain the same. B. Both periods would increase. C. Both periods would decrease. D. The period of the pendulum would increase but the period of the spring would stay the same. E. The period of the pendulum would decrease but the period of the spring would stay the same.
An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
A. 32 J B. 52 J C. 41 J D. 25 J E. 29 J