An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux ?B through any area completely inside the solenoid, centered on the solenoid axis but at a 45° angle to the axis so that it touches the inside of the solenoid as shown below, is
?
?
a.
c
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The average distance from Venus to the Sun is _____
A) 0.7 AU B) 1 AU C) 1.4 AU D) 2 AU
Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____
a. determine the relationship between the period of pulses and luminosity b. measure the mass of a star c. calculate a star's diameter d. determine the chemical composition of a Type I Cepheid e. narrow their study to eclipsing binary stars only
The density of a neutron star is
a. about the same as that of a white dwarf. b. about the same as that of the Sun. c. about the same as an atomic nucleus. d. zero.
Use the appropriate relativity formula given in the text to answer the following. Isabella is moving by you at a speed of 0.8c. Although 1 minute passes on your watch, how much time will you see pass on her watch?
A) 36 seconds B) 1 minute C) 48 seconds D) 100 seconds