The scale of apparent visual magnitudes extends into negative numbers to represent the faintest objects in the sky
a. True
b. False
Indicate whether the statement is true or false
False
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Which of the following statements is true of type I supernovae?
A) They occur when a white dwarf has a lower mass than the Chandrasekhar limit. B) They appear to be produced by the collapse and explosion of a massive star. C) They are seen as a dimming star from Earth. D) They have no hydrogen lines in their spectra.
Force on a Wire: A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section DE of this wire?
A. 0.30 N perpendicular out of the page B. 0.12 N perpendicular into the page C. 0.30 N perpendicular into the page D. 0.12 N perpendicular out of the page E. 0.20 N perpendicular out of the page
The current through a 50-? resistor is I = (0.80
A) sin(240t), where t is measured in seconds. What is the rms current? A) 0.57 A B) 0.80 A C) 1.1 A D) 1.6 A
One side of the Moon continually facing Earth is
A) a passing phenomenon. B) a cosmic coincidence. C) tidal lock.