The coil in a 60-Hz ac generator has an area of 3.0 × 10-2 m2 and is rotated in a 0.12 T magnetic field. The coil has 125 turns. What is the peak output voltage of this generator?
A)
170 V
B)
120 V
C)
200 V
D)
110 V
E)
220 V
A
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The inclination of the axis of the Earth varies from 22° to 24° degrees taking ____ to complete a cycle. This is a factor in the Milankovitch hypothesis of ice ages
a. 24 hours b. 1 year c. 499 years d. 41,000 years e. Wrong! The Earth's axis tilt is fixed at exactly 23.50 with no variation whatsoever.
If you launch two probes in opposite directions from the Space Station, they will meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through space time, but those paths happen to meet. B) They are following the allowed orbits according to Newton's universal law of gravitation. C) The force of gravity tugs on the probes and forces them to orbit Earth. D) Objects launched in space always follow circular paths, no matter where they are.
In 1983 the standard meter was redefined to what it is currently. What was the previous definition from 1960 based on?
a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by certain krypton atoms c. distance from the Earth's equator to the North Pole d. the distance light travels in a certain fraction of a second
A train travels at a constant speed of 60.4 mi/h for 101.5 min. What distance does the train cover expressed to the correct number of significant figures?
A) 100 mi B) 102 mi C) 102.2 mi D) 102.18 mi E) 102.181 mi