A solid, uniform sphere of mass 2.0 kg and radius 1.7 m rolls from rest without slipping down an inclined plane of height 7.0 m. What is the angular velocity of the sphere at the bottom of the inclined plane?
A) 5.8 rad/s
B) 9.9 rad/s
C) 11 rad/s
D) 7.0 rad/s
Answer: A
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A 5-N block of wood is difficult to fully submerge in a pool of mercury because the buoyant force on the block when submerged is
A) less than 5 N. B) 5 N. C) much more than 5 N.
According to the nebular theory, how did the Oort cloud form?
A) It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system. B) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet. C) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula. D) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet. E) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets.
If the rest wavelength of a certain line is 600 nm, but we observe it at 594 nm, then
A) the source is getting 1% hotter as we watch. B) the source is spinning very rapidly, at 1% of the speed of light. C) the source is receding from us at 10% of the speed of light. D) the source is approaching us at 1% of the speed of light. E) the source is approaching us at 0.1% of the speed of light.
Which of the following is true of visible light?
A) Wavelength increases from violet light to red light. B) Wavelength decreases from violet light to red light. C) Wavelength increases from red light to orange light. D) Wavelength decreases from blue light to green light.