True or False: A photon is reflected from a mirror. Although the photon carries momentum, its change in momentum is zero when it reflects from the mirror, so it can't exert a force on the mirror
1.True
2.False
2
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A planetary nebula is
a. the expelled outer atmosphere of a medium-mass star. b. produced by a supernova explosion. c. produced by a nova explosion. d. a nebula within which planets are forming. e. a cloud of hot gas surrounding a planet.
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
Both protons and neutrons (and their anti-particles) froze out:
A) after 10-43 seconds, at the Planck Era. B) at 1032 K, at the end of the Inflationary Era. C) at 1013 K, about .0001 seconds after the Big Bang. D) after about a minute of expansion. E) about 50,000 years after the Big Bang.
What is the inductance of a series RL circuit in which R = 1.0 K? if the current increases to one-third of its final value in 30 ?s?
a. 74 mH b. 99 mH c. 49 mH d. 62 mH e. none of the above