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

Physics & Space Science

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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.

Physics & Space Science

The kinetic coefficient of friction is usually larger than the static coefficient of friction

Indicate whether the statement is true or false

Physics & Space Science

Stars with multiple planets orbiting them are expected to be rare

Indicate whether the statement is true or false

Physics & Space Science

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

Physics & Space Science