If a body were in orbit very near the surface of the earth, its centripetal acceleration would be
a. equal to g
b. smaller than g
c. larger than g
d. dependent on its mass
e. none of the above
A
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An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal energy of the athlete?
A) -225 kJ B) -1075 kJ C) 1075 kJ D) 225 kJ E) 276 kJ
What is the escape speed from a planet of mass m and radius r if m = 3.2 × 10^23 kg and r = 2.4 × 10^6 m?
a. 5.5 km/s b. 4.2 km/s c. 5.2 km/s d. 4.8 km/s e. 3.7 km/s
According to models of planetary interiors, the differences in mass among the four jovian planets (Jupiter, Saturn, Uranus, and Neptune) are due primarily to differences
A) in the amounts of material in the layers extending from the tops of their cores to their surfaces. B) in their core masses. C) in composition. D) in density.
In an RC circuit, what fraction of the final energy is stored in an initially uncharged capacitor after it has been charging for 3.0 time constants?
a. 0.84 b. 0.90 c. 0.75 d. 0.60 e. 0.03