What power lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?
A) -2.67 D
B) +2.67 D
C) +5.33 D
D) -5.33 D
E) +1.00 D
B
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A coil of 150 turns of wire is in the form of a circle, carries a current of 63 mA, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T. The torque on the coil has a maximum value of 0.25 Nm. What is the radius of the coils?
A. 9.2 cm B. 13 cm C. 0.56 cm D. 7.5 cm
If is about 30 
?
A. Roughly zero
B. Roughly 
/30
C. Roughly /1.4
D. Roughly
E. Roughly 1.4
F. Roughly 30
T. Other (specify)
According to the present estimates, the Universe is about ________ years old.
A. 14 × 105 B. 14 × 107 C. 14 × 1011 D. 14 × 109
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5 c and a spaceship moves toward it (to the west) at a speed of 0.8 c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7 c b. 0.21 c c. -0.21 c d. 0.93 c e. -0.93 c