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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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
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)
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.