According to Newton's Law of Universal Gravitation, if the Moon were three times further from Earth, the force by Earth on the Moon would
A) increase by a factor of 3.
B) decrease by a factor of 3.
C) increase by a factor of 9.
D) decrease by a factor of 9.
E) stay the same.
D
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A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference. (a) What is the resistance of the wire? (b) What is the resistivity of the material from which the wire is made?
What will be an ideal response?
A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor.
A. 0.96 mT B. 1.7 mT C. 0.55 mT D. 1.2 mT E. 0.40 mT
Which of the solenoids described below has the greatest magnetic field along its axis?
A) a solenoid of length L, with N turns and a current I B) a solenoid of length L, with N/2 turns and a current I C) a solenoid of length L/2, with N/2 turns and a current I D) a solenoid of length 2L, with N turns and a current I/2 E) a solenoid of length 2L, with 2N turns and a current 2I
Lunar eclipses can occur only during a
A) new Moon. B) first quarter Moon. C) full Moon. D) third quarter Moon.