Which internal energy source is the most important in continuing to heat the terrestrial planets today?
A) accretion
B) differentiation
C) radioactivity
D) tidal heating
C) radioactivity
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Pressure in a Liquid: A container has a vertical tube, whose inner radius is 20.00 mm, connected to it at its side, as shown in the figure. An unknown liquid reaches level A in the container and level B in the tube-level A being 5.0 cm higher than level B. The liquid supports a 20-cm high column of oil, between levels B and C, whose density is 900 kg/m3. The density of the unknown liquid is closest to
A. 3600 kg/m3. B. 3900 kg/m3. C. 2800 kg/m3. D. 3100 kg/m3. E. 3300 kg/m3.
The typical temperature of an interstellar cloud that could collapse to a protostar is about ________.
A. 1,500 K B. 10 K C. 300 K D. 1,000 K
Stars with multiple planets orbiting them are expected to be rare
Indicate whether the statement is true or false
The kinetic coefficient of friction is usually larger than the static coefficient of friction
Indicate whether the statement is true or false