The Moon's density, when compared to Earth's, is about
A) 10% as large.
B) 25% as large.
C) 50% as large.
D) 60% as large.
E) the same.
D
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Two identical small charged spheres are a certain distance apart, and there is an electrostatic force of magnitude F that they exert on each other. With time, charge gradually diminishes on both spheres by leaking off
When each of the spheres has lost half its initial charge, what will be the magnitude of the electrostatic force exerted on each one? A) 1/16 F B) 1/8 F C) 1/4 F D) 1/2 F E) 1/ F
At a distance D from a very long (essentially infinite) uniform line of charge, the electric field strength is 1000 N/C. At what distance from the line will the field strength to be 2000 N/C?
A) 2D B) D C) D/ D) D/2 E) D/4
A pole-vaulter holds out a 5.5kg, 4.75m pole horizontally in front of him. Assuming the pole is uniform in construction, and that he holds the pole with one hand at the very end, and one hand 0.75m from the end, what is the torque applied by the Earth to the pole?
A. 40N B. 88N C. Not enough information is given D. 128N
Of the temperature ranges below, which range represents the smallest range of actual temperature?
A) 50-100° Kelvin B) 50-100° Celsius C) 50-100° Fahrenheit D) They all represent the same change in temperature.