Which of the following is an example of a galaxy?
A) The Canopus Galaxy
B) The Milky Way Galaxy
C) The Proxima Centauri Galaxy
D) The Alpha Centauri Galaxy
B
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Long 2 inch diameter oak dowels are heated at one end as shown.
Determine the time before the end reaches 100ºF around the edge of the dowel, assuming an initial temperature of 50ºF for the dowel.
Fluid Flow: Ideal incompressible water is flowing in a drainage channel of rectangular cross-section. At one point, the width of the channel is 12 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m/s. At a point downstream, the width has narrowed to 9.0 m, and the depth of water is 8.0 m. What is the speed of the flow at the second point?
A. 2.0 m/s B. 2.5 m/s C. 3.0 m/s D. 3.5 m/s E. 4.0 m/s
Carl has a 5-inch refracting telescope, and Jim has a 3-inch reflecting telescope. Whose telescope has a higher light-gathering power?
A. Carl's, because lenses gather more light. B. Carl's, because the larger the diameter, the more light to be collected. C. Jim's, because the smaller the diameter, the more light to be collected. D. Jim's, because mirrors gather more light.
Which one of the following choices is not a possible way to produce a magnetic field?
a) Set up a current in a long, straight wire. b) Uniformly distribute charges over the surface of a conductor. c) Make an object out of materials that have an intrinsic magnetic field. d) Pass a current through a coil of wire.