Faraday's Law: A round flat metal coil has 180 turns and negligible resistance. It is connected in a series circuit with a 17-? resistor, with nothing else in the circuit. You measure that a 6.0-A current flows through the resistor when a magnetic field through the coil, perpendicular to its area, is changing at 3.0 T/s. What is the radius of the coil?
A. 0.25 m
B. 0.014 m
C. 0.54 m
D. 0.043 m
Answer: A
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The earth's magnetic field at the magnetic equator is approximately
A) 104T. B) 1/2 T. C) 10-5 T. D) 10-3 T. E) 104 Gauss.
Current measurements of the density of the universe support the prediction of the theory of inflation that the universe should be flat
Indicate whether the statement is true or false
A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up. Case B: Thrown straight down
Case C: Thrown out at an angle of 45° above horizontal. Case D: Thrown straight out horizontally. In which case will the speed of the stone be greatest when it hits the water below if there is no significant air resistance? A) Case A B) Case B C) Case C D) Case D E) The speed will be the same in all cases.
A lunar month is about 28 days. If the Moon were closer to Earth than it now is, the lunar month would be
1) less than 28 days, 2) more than 28 days, 3) still 28 days, mainly because 4) centripetal force would lessen with decreased distance. 5) a closer Moon means an increase in both gravitational force and speed, which in a smaller orbit means shorter time. 6) orbital speed about the center of mass of Earth-Moon system is not dependent upon the distance between Earth and Moon. 7) of tidal friction.