The Jovian planets
a. are composed mainly of hydrogen and helium.
b. have no solid surface.
c. have rings.
d. all of these.
d
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In simple harmonic motion the position of the oscillator:
A. Is behind its acceleration by a quarter cycle, or 
radians
B. Leads its acceleration by a quarter cycle, or 
radians
C. Leads its velocity by a quarter cycle, or 
radians
D. Is behind its velocity by a quarter cycle, or 
radians
An RC circuit is connected across a DC voltage source through an open switch. The switch is closed at t = 0 s. Which of the following is a correct statement regarding this circuit?
A) The charge on the capacitor after four time constants is about 98% of the maximum value. B) The charge on the capacitor after one time constant is about 25% of its maximum value. C) The charge on the capacitor after one time constant is about 50% of its maximum value. D) The voltage on the capacitor after two time constants is about 14% of the maximum value. E) The voltage on this capacitor after two time constants is about 100% of its maximum value.
According to Kepler's laws, Halley's Comet circles the Sun in an elliptical path with the Sun at one focus of the ellipse. What is it that Kepler's laws indicate is at the other focus of the ellipse?
a. nothing b. the Earth c. The comet itself passes through the other focus. d. The tail of the comet stays at the other focus.
Torque: The figure shows a person's foot. In that figure, the Achilles tendon exerts a force of magnitude F = 720 N. What is the magnitude of the torque that this force produces about the ankle joint?
A. 12 N ? m B. 16 N ? m C. 21 N ? m D. 26 N ? m E. 36 N ? m