Which of the following is a vector quantity?
a. Energy
b. Power
c. Work
d. None of these
d
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Human hearing is best in
A) infrasonic sound. B) ultrasonic sound. C) both of these D) neither of these
An iron ball is placed in a pie pan that floats in a bucket. The water level is marked at the side of the bucket. Then the iron ball is removed and allowed to sink in the bucket. The water line at the side of the bucket is
A) lower. B) the same. C) higher.
The second is currently defined as
A) 1/86,400 of a mean solar day. B) 1/86,164 of a sidereal day. C) 1/31,557,600 of the period of the Earth's rotation around the Sun. D) the time required for light to travel 1/299,792,458 of a meter. E) the time that it takes the radiation from a Cesium-133 atom to complete 9,192,631,770 cycles of oscillation.
In the lab, a relativistic proton has a momentum of 1.00 × 10-19 kg ? m/s and a rest energy of 0.150 nJ. What is the speed of the proton in the lab? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 0.170c B) 0.196c C) 0.911c D) 0.930c E) 0.951c