Which one of these elements is normally the remnant of a supernova?
A) hydrogen
B) helium
C) silver
D) none of these
Answer: C
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Lenz's Law: The wire in the figure carries a current I that is decreasing with time at a constant rate. The wire and the three loops are all in the same plane. What is true about the currents induced in each of the three loops shown?
A. No current is induced in any loop. B. The currents are counterclockwise in all three loops. C. The currents are clockwise in all three loops. D. Loop A has clockwise current, loop B has no induced current, and loop C has counterclockwise current. E. Loop A has counterclockwise current, loop B has no induced current, and loop C has clockwise current.
The Moon's density, when compared to Earth's, is about
A) 10% as large. B) 25% as large. C) 50% as large. D) 60% as large. E) the same.
A painter of mass 80 kg climbs 3.0 m up a ladder. The painter has gained momentum in the amount of
A. 240 J. B. 2352 J. C. 784 J. D. Can't say without knowing his velocity change (if any)
What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N ? m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
A. 66 A B. 89 A C. 61 A D. 75 A E. 37 A