While Ganymede and Callisto are about the same size, the surface of Callisto is much younger, with considerable tectonic reformation
Indicate whether the statement is true or false
FALSE
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You have measured Doppler shifts to plot velocity curves for two otherwise identical stars. Star A has a period of 6 months and Star B has a period of 1 year. What can you say about the planets causing the motions of these stars?
A) Star A's planet is more massive than Star B's planet. B) Star A's planet must orbit closer in than Star B's planet. C) It is impossible to say anything about the planets orbiting these stars. D) Star B must have a planet like Earth.
A pair of helium nuclei fused together produces
A) helium isotope. B) lithium. C) beryllium. D) carbon. E) iron.
An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?
A) 30 m B) 39 m C) 48 m D) 57 m
The resistivity of gold is 2.44 × 10-8 ? ? m at room temperature. A gold wire that is 1.8 mm in diameter and 11 cm long carries a current of 170 mA. How much power is dissipated in the wire?
A) 0.030 mW B) 0.0076 mW C) 0.013 mW D) 0.019 mW E) 0.025 mW