The size of a galaxy's central black hole is proportional to the mass of its disk
a. True
b. False
Indicate whether the statement is true or false
False
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The apparent visual magnitude of a star is a measure of the star's
a. size. b. intensity. c. distance. d. color. e. temperature.
RMS and Peak Quantities: American power plants usually supply 120 V ac.(a) At what frequency is this voltage supplied?(b) What is the maximum voltage?
What will be an ideal response?
shown. Inside the glass, the laser beam will take path nair = 1.000, nglass = 1.50
A. 1
B. 2
C. 3
Starting outside the region with the magnetic field, a single square coil of wire moves across the region with a uniform magnetic field 
perpendicular to the page. The loop moves at constant velocity 
. As seen from above, a counterclockwise emf is regarded as positive. Roger claims that the graph shown below represents the induced emf. Martin says he's wrong. In which direction did the loop move over the plane of the page, or is Martin correct?
a.
Roger is correct: the loop moved from bottom to top.
b.
Roger is correct: the loop moved from top to bottom.
c.
Roger is correct: the loop moved from left to right.
d.
Roger is correct: the loop moved from right to left.
e.
Martin is correct: none of these directions of motion will produce the graph of emf vs t.