Stars originate as large bodies of slowly rotating gas. Because of gravity, these clumps of gas slowly decrease in size. The angular velocity of a star increases as it shrinks because of
A. conservation of angular momentum
B. conservation of linear momentum
C. conservation of energy
D. the law of universal gravitation
E. conservation of mass
Answer: A
You might also like to view...
A brass rod, 75.0 cm long and having a cross-sectional area of 2.50 cm2, conducts heat from a large furnace at 375°C into a very large cold water bath at 10.0°C
without losing any heat at the lateral surface of the rod. Steady state has been established, and the thermal conductivity of brass is 109 W/m?K. The rate at which the entropy of the system (furnace plus water) is changing is closest to A) 2.05 × 10-2 W/K. B) 2.64 × 10-2 W/K. C) 3.54 × 10-2 W/K. D) 4.69 × 10-2 W/K. E) 6.74 × 10-2 W/K.
Two stereo speakers mounted 4.52 m apart on a wall emit identical in-phase sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers
You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity drops to zero. If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the wavelength of the sound waves? CAREFUL! The distance to the wall is NOT much greater than the distance between the speakers. A) 1.7 m B) 2.1 m C) 2.6 m D) 2.9 m
For experiments involving the setup shown in figure Q4.1b, which of the following possible results (if seen) regarding the final value displayed by the voltmeter would probably not be consistent with the wave model of light? 
A. It increases as the light’s intensity increases. B. It is independent of the light’s intensity. C. It varies as the light’s wavelength changes. D. It increases as the rate of electron ejection increases.
The Roche limit refers to a ________.
A. distance B. speed C. density D. mass E. force