Which of the following statements correctly describes the motion of the particles in Saturn’s rings?
a. Particles in all the rings hover motionlessly high above Saturn.
b. Particles in the inner rings orbit Saturn at a faster speed than particles in the outer rings.
c. Particles in the inner rings orbit Saturn at a slower speed than particles in the outer rings.
d. All the particles in the rings orbit Saturn with the same orbital period.
Particles in the inner rings orbit Saturn at a faster speed than particles in the outer rings.
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A star enters the main sequence when ________.
A. it forms planets B. nuclear fuel in its core can supply enough energy to stop its collapse C. it collapses, and its envelope becomes degenerate D. it stops fusing nuclear fuel in its core and starts to expand
A car moving at a steady 10 m/s on a level highway encounters a bump that has a circular cross-section with a radius of 30 m. The car maintains its speed over the bump
What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the top of the bump? A) 200 N B) 390 N C) 790 N D) 490 N E) 590 N
The image of a convex mirror is always
a. virtual, inverted, and larger. b. virtual, upright, and smaller. c. real, upright, and smaller. d. real, inverted, and larger.
What is the speed of sound in the air inside a furnace where the temperature is 500 degrees Celsius (773 Kelvin)?