Suppose you could float in space just a few meters above Saturn's rings. What would you see as you looked down on the rings?
A) countless icy particles, ranging in size from dust grains to large boulders
B) a solid, shiny surface, looking much like a piece of a Blu-ray disk or DVD (or vinyl record album) but a lot bigger
C) dozens of large "moonlets" made of metal and rock, each a few kilometers across
D) long, solid strings of matter, each distinct from the next
A) countless icy particles, ranging in size from dust grains to large boulders
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The exchange particles for the strong force are
A) neutrinos. B) photons. C) quarks. D) gluons. E) W+, W-, and Z.
At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
A. 3.8 m/s B. 3.4 m/s C. 5.0 m/s D. 4.4 m/s E. 4.6 m/s
In a relay race, runner A is carrying the baton and has a speed of 2.80 m/s. When he is 25.0 m behind the starting line, runner B starts from rest and accelerates at 0.0800 m/s2. How long afterwards will A catch up with B to pass the baton to B?
A) 5.17 s B) 10.5 s C) 11.9 s D) 20.4 s E) Runner A never catches up.
When a spinning ice skater pulls in his arms, he spins faster because ________
A) there exists an unbalanced reaction force B) there is less friction with the ice C) there is less friction with the air D) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation