A tetherball is attached to a pole with a 2.0-m rope. It is circling at 0.20 rev/s. As the rope wraps around the pole, it shortens. How long is the rope when the ball is moving at 6.0 m/s?
a. 1.8 m
c. 1.2 m
b. 0.83 m
d. 1.0 m
B
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Phase Angles: The figure shows a series ac circuit. The inductor has a reactance of 60 ? and an inductance of 210 mH. A 30-? resistor and a capacitor whose reactance is 80 ? are also in the circuit, and the rms current in the circuit is 2.2 A. What is the phase angle of the circuit?
A. -34° B. 34° C. +90° D. -56° E. 56°
Contrast observation of ionized and neutral hydrogen in space
What will be an ideal response?
Equilibrium: Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100-N pull, as shown in the figure. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. 
Which of the figures below shows a correct free-body diagram of the horizontal forces acting on the upper block, A?
A. 
B. 
C. 
D. 
E. 
Latent Heats: How much heat must be added to a 8.0-kg block of ice at -8°C to change it to water at 14°C? The specific heat of ice is 2050 J/kg ? C°, the specific heat of water is 4186 J/kg ? C°, the latent heat of fusion of ice is 334,000 J/kg, and 1 cal = 4.186 J.
A. 780 kcal B. 140 kcal C. 180 kcal D. 810 kcal E. 730 kcal