If Earth's mass decreased to one-half its original mass with no change in radius, then your weight would
A) decrease to one-quarter.
B) decrease to half.
C) stay the same.
D) none of the above
Answer: B
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Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?
A) 10 cm B) -40 cm C) -50 cm D) 40 cm E) 50 cm
General relativity deals with
A. stationary reference frames B. reference frames moving at constant velocities C. accelerated reference frames
A horizontal wire of length 3.6 m carries a current of 6.0 A and is oriented so that the current direction is 50° S of W. The Earth's magnetic field is due north at this point and has a strength of 0.14 × 10^-4 T. What is the direction of the force on the wire?
a. 40° S of E c. toward the Earth's surface b. out of the Earth's surface d. due east
About how deep is the photosphere?
A) 300 meters B) 500 meters C) 300 km D) 500 km