What terrestrial world is shown in this visible-light photo?
A) Venus
B) Earth
C) Mercury
D) Mars
A) Venus
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In about 14,000 AD, the North Pole of Earth will point at star ________.
A. Antares B. Vega C. Thuban D. Polaris
What, approximately, are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume ? = 500 nm light and a pupil diameter D = 0.50 cm. Assume eye fluid has an average n = 1.33
a. 150 m b. 100 m c. 250 m d. 25 m e. 18 m
What is the magnitude of the magnetic force on a charged particle (Q = 5.0 ?C) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = ?4.0 T, and Bz = 3.0 T?
a. 2.8 N b. 1.6 N c. 1.2 N d. 2.0 N e. 0.4 N
A sinusoidally varying potential difference has amplitude 170 V. What is its minimum instantaneous value?
1.170 V 2.120 V 3.0 4.-120 V 5.-170 V