The number of protons in the nucleus of an atom determines
A. the half-life of the nucleus.
B. the atomic mass.
C. the density of the nucleus.
D. the number of neutrons in the nucleus.
Answer: C
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The element most abundant in the Sun is oxygen
Indicate whether the statement is true or false
Which of these was NOT a part of the original Copernican model?
A) The Sun lies at the center of the solar system. B) Mercury must move faster in its orbit than any other planet. C) The Earth rotates on its axis once a day. D) Venus can go all the way around the Sun. E) Mercury speeds up at perihelion, and slows down at aphelion.
A 2.0 kg mass is connected to a spring with a spring constant of 9.0 N/m. The displacement is given by the expression x(t) = 12.0 cm sin 
What is the maximum displacement of the simple harmonic motion?
A. 8.0 cm B. 12 cm C. 20 cm D. 24 cm E. 30 cm
While you are standing in the aisle of a bus, the driver suddenly makes a left turn. You lurch to the right due to
A) an unbalanced force. B) your tendency to keep moving forward. C) an equilibrium challenge.