The only force acting on a 2.0-kg body as it moves along the x axis is given by Fx = (12 ? 2.0x) N, where x is in m. The velocity of the body at x = 2.0 m is 5.5 
m/s. What is the maximum kinetic energy attained by the body while moving in the +x direction?
A. 36 J
B. 39 J
C. 43 J
D. 46 J
E. 30 J
Answer: D
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An RC circuit is connected across an ideal DC voltage source through an open switch. The switch is closed at time t = 0 s. Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)
A) The capacitor charges to its maximum value in one time constant and the current is zero at that time. B) The potential difference across the resistor and the potential difference across the capacitor are always equal. C) The potential difference across the resistor is always greater than the potential difference across the capacitor. D) The potential difference across the capacitor is always greater than the potential difference across the resistor E) Once the capacitor is essentially fully charged, there is no appreciable current in the circuit.
The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
and 
.
?
The plane is most likely
A. just touching down. B. in level flight in the air. C. ascending. D. descending. E. taking off.
Which person realized the laws of gravity applied to objects both on Earth and in space?
A) Newton B) Copernicus C) Kepler D) Galileo
Which photo shows what we call a gibbous moon? (Note: Assume these photos were taken in the Northern Hemisphere.)
A) 1 B) 2 C) 3 D) 4