If a force on an object is aimed opposite the direction of the object's velocity, the force does
a. no work c. negative work
b. positive work d. any of the above
C
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A transverse periodic wave is represented by the equation y(z, t) = -2.0 cm sin(1,200 rad/s t - 20.0
x). Another transverse wave is represented by the equation y(z, t) = +2.0 cm sin(1,200 rad/s t + 20.0
z). What is the equation that represents the superposition of the two waves?
A. y(z, t) = 4.0 cm sin(1,200 rad/s t - 20.0
z)
B. y(x, t) = 4.0 cm sin(1,200 rad/s t)cos (20.0x)
C. y(x, t) = +4.0 cm cos(1,200 rad/s)sin (20.0x)
D. y(x, t) = +4.0 cm cos(1,200 rad/s) + (20.0x)
Capacitors in Combination: A potential difference of V = 100 V is applied across two capacitors in series, as shown in the figure. If C1 = 10.0 ?F and the voltage drop across it is 75 V, what is the capacitance of C2? 
A. 30 ?F B. 2.5 ?F C. 7.5 ?F D. 3.3 ?F
Suppose you live at the equator. Describe the path of the Sun through your sky for each of the following days: a. the day of the spring equinox b. the day of the summer solstice c. the day of the winter solstice
What will be an ideal response?
When a damping force is applied to a simple harmonic oscillator which has period T0 in the absence of damping, the new period T is such that
a. T < T0. b. T = T0. c. T > T0. d. wT < w0T0. e. wT > w0T0.