Why does the rotation of a protostar slow down over time?
A) Magnetic fields can transfer angular momentum to the protostellar disk and protostellar winds can carry angular momentum away.
B) All rotating objects slow down over time.
C) The onset of fusion causes the rotation rate to slow dramatically.
D) Magnetic fields of other stars interact with the magnetic fields of the protostars, slowing its rotation.
A) Magnetic fields can transfer angular momentum to the protostellar disk and protostellar winds can carry angular momentum away.
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The average adult radiates heat energy at the same rate as
a. a 10-W light bulb. b. a 100-kW light bulb. c. a 100-W light bulb. d. none of these.
If one kilogram of hydrogen is converted to helium, how much energy will be generated?
a. 9 × 10^16 J b. 3 × 10^8 J c. 6.3 × 10^14 J d. 2.2 × 10^6 J e. 3.2 × 10^7 J
A 2000 kg car is traveling on a banked curved icy road without sliding. The velocity of the car is 30 m/s and the road is banked at an angle of 20.0 degrees. The radius of curvature of the road is
A. 175 m. B. 204 m. C. 252 m. D. 302 m. E. 375 m.
The reason that we can calculate the change in entropy of a system is that
a. entropy always decreases. b. entropy always increases. c. the entropy of the universe always remains constant. d. it depends only on the properties of the initial and final equilibrium states. e. systems always follow reversible paths.