A 3.000 kg ball is pitched with a kinetic energy of 20.00 Joules. Then the momentum of the ball is
A. 7.500 kg m/s.
B. 8.350 kg m/s.
C. 9.450 kg m/s.
D. 10.95 kg m/s.
E. 12.50 kg m/s.
D. 10.95 kg m/s.
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A bone is dug up and analyzed and found to contain 1/16--one sixteenth--of the amount of 14C radioactivity of normal bones in living bodies. The half-life of 14C is 6000 years. Roughly how long has the individual been dead?
A) 24, 000 years B) 6000 years C) 30,000 years D) 36,000 years E) Impossible to tell from the given information.
The energy of sound in air eventually becomes
A) increased internal energy in the air. B) weaker and weaker until it disappears. C) cancelled by destructive interference. D) all of the above E) none of the above
On Mars, an object dropped from rest falls a distance of 4 m in 1 second. How far will it fall in 2 second, neglecting "air" resistance on Mars?
A) 8 m B) 12 m C) 16 m D) 32 m E) 24 m
What information does the Doppler technique give about an extrasolar planet?
A) the planet's radius B) the planet's density C) the planet's minimum mass D) all of the above