Voids are
A. spaces between stars.
B. regions in the centers of galaxies containing many black holes.
C. spaces between galaxies within a cluster.
D. huge regions of space with few or no galaxies.
Answer: D
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Toasters have wires in them that heat up to warm the items placed inside. For the toaster to work properly, these wires must
A. be connected to a tiny voltage. B. have more resistance than the power cord. C. be connected to a very large voltage. D. have less resistance than the power cord.
In nuclear fission,
A. a nucleus is split into two less massive nuclei. B. two heavy nuclei are induced to decay simultaneously. C. a nucleus is bombarded with another nucleus in order to induce an alpha decay. D. high-energy particles are released from a nucleus that is at rest.
A meter stick is hinged at its lower end and allowed to fall from a vertical position. If its moment of inertia is ML2/3, with what angular speed does it hit the table?
a. 5.42 rad/s c. 1.22 rad/s b. 2.71 rad/s d. 7.67 rad/s
Constructive interference of two coherent waves will occur if the path difference is
A) 3/4 ?. B) 6/2 ?. C) 3/2 ?. D) 1/4 ?. E) 6/4 ?.