A constant torque is applied to a flywheel. Which of the following mechanical quantities will be constant?
A. Angular momentum
B. Rotational acceleration
C. Rotational velocity
D. Rotational energy
E. Linear velocity of a particle on the rim
Answer: B
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The efficiency of a heat engine is defined as the ratio of
A) the heat input at the high temperature to the heat output at the low temperature. B) the heat output at the low temperature to the heat input at the high temperature. C) the work it does to the heat input at the high temperature. D) the work it does to the heat output at the low temperature. E) the work it does to the difference between the heat input from the heat output.
In a certain nuclear reactor, neutrons suddenly collide with carbon nuclei, which have 12 times the mass of neutrons
In a head-on elastic collision with a stationary carbon nucleus, what fraction of its initial speed does the neutron have after the collision? A) 11/13 B) 11/12 C) 10/13 D) 1/12 E) 5/6
No force of gravity acts on an astronaut in an orbiting space station
1.True 2.False
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
A. A B. B. C. C. D. D. E. E.