A spinning neutron star has been observed at the center of a
A) supernova remnant.
B) planetary nebula.
C) red supergiant.
D) protostar.
A) supernova remnant.
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Planetary rings are
A) nearer to their planet than any of the planet's large moons. B) orbiting in the equatorial plane of their planet. C) composed of a large number of individual particles that orbit their planet in accord with Kepler's third law. D) known to exist for all of the jovian planets in our solar system. E) All of the above
Which force would not be explained in a grand unified theory, but would require a "theory of everything"?
a. The weak force. b. The strong (or color) force. c. The electromagnetic force. d. The gravitational force. e. The electroweak force.
Power: A sand mover at a quarry lifts 2000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute. What minimum power must be supplied to this machine?
A. 520 W B. 3.9 kW C. 6.7 kW D. 4.3 kW E. 1.1 kW
A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
A) g downward B) 2 g upward C) 0.5 g downward D) g upward E) 2 g downward