From the Sun, the distance to the Galactic Center is about
A) 100,000 light-years.
B) 8 kpc.
C) 100 billion parsecs.
D) 8,000 light-years.
E) 225 million light-years.
B
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A radiation detector measures radioactivity decay of a piece of radium by catching and counting alpha particles it emits. Making this measurement affects the
A) radiation rate of the piece of radium. B) alpha particles that are caught and counted. C) both of these D) neither of these
Luminous (normal) matter makes up approximately what percentage of the known matter in the universe?
A) 15% B) 5% C) 60% D) 95%
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 rad/sec2 acquires an angular velocity of 5.00 rad/sec. The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the angular distance traveled by a point 4.00 cm from the center, at the time 10.0 seconds from the start?
A. 27.6 rad B. 37.5 rad C. 40.7 rad D. 48.2 rad E. 51.2 rad
To double the total energy of a mass oscillating at the end of a spring with amplitude A, we need to
A.
.B.
.C.
D.
E.
.