A carousel that is 5.00 m in radius has a pair of 600-Hz sirens mounted on posts at opposite ends of a diameter. The carousel rotates with an angular velocity of 0.800 rad/s. A stationary listener is located at a distance from the carousel
The speed of sound is 350 m/s. The maximum beat frequency of the sirens at the position of the listener is closest to A) 6 Hz.
B) 8 Hz.
C) 10 Hz.
D) 12 Hz.
E) 14 Hz.
E
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A star on the main sequence has 7 solar masses. The star will evolve into a ____________ and its core will be supported by ______________.
a. white dwarf, electron degeneracy pressure b. neutron star, neutron degeneracy pressure c. black hole, no pressure (i.e., it will not be supported) d. white dwarf, neutron star, or black hole; electron degeneracy, neutron degeneracy, and no pressure, respectively.
What is the mass of an electron in MeV/c2?
a. 0.511 MeV/c2 b. 105.7 MeV/c2 c. 1777 MeV/c2 d. none of the above
A golf ball moving forward with 1 unit of momentum strikes a heavy bowling ball that is initially at rest. After the golf ball bounces backward, the bowling ball is in motion with a momentum that must be
1) 1 unit. 2) more than 1 unit. 3) less than 1 unit. The magnitude of the golf ball's momentum after collision must be somewhat less than 1 unit, for otherwise a violation would occur in the conservation of 4) energy. 5) momentum. 6) both. 7) neither.
Suppose an unpowered but moving railroad car receives some coal (basically at rest) from a stationary conveyor belt. This coal therefore only carries chemical energy into the car. This mass transfer will
A. Cause the car’s speed to increase. B. Cause the car’s speed to decrease. C. Have no effect on the car’s speed.