The three principal sources of the internal heat of terrestrial planets are
A) accretion, differentiation, and eruption.
B) accretion, differentiation, and radioactivity.
C) convection, differentiation, and eruption.
D) conduction, convection, and eruption.
E) conduction, differentiation, and accretion.
B
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What is the source of Jupiter's intense radio waves and magnetism?
A) charged particles trapped in Jupiter's solid iron core similar to Earth B) liquid metallic hydrogen swirling in the rapidly spinning mantle C) the ionized sulfur ejected into a torus around Jupiter by Io D) the auroral displays in the polar regions, just like with the Earth E) a liquid iron and nickel outer core, just like the Earth's magnetic field
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes 0.8 s for the wave to travel the 20 m to the opposite tower. If one meter of the rope has a mass of 0.35 kg, find the tension in the tightrope
Where is it low tide?
A) point 1 only B) point 2 only C) points 1 and 3 D) points 2 and 4
An electric clothes dryer draws 20 A at 220 V. If the clothes put into the dryer have a mass of 7.0 kg when wet and 3.0 kg dry, how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, Lv = 2.26 × 10^6 J/kg.)
a. 55 min c. 16 min b. 26 min d. 34 min