The strong gravitational field of a white dwarf slows down the speed of escaping light, and results in the gravitational redshift.
Answer the following statement true (T) or false (F)
False
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Lenz's Law: A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet is released from rest and falls toward the coil. As viewed from above, what is the direction of the current induced in the coil as the magnet approaches the coil?
A. counterclockwise B. clockwise C. No current is induced in the coil. D. An emf but no current is induced in the coil.
The most abundant element in Saturn's atmosphere is
A) ammonia. B) hydrogen. C) helium. D) methane. E) nitrogen.
A rock, released at rest from the top of a tower, hits the ground after 3.5 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)
a. 34 m/s b. 17 m/s c. 44 m/s d. 68 m/s e. 24 m/s
The south pole of a bar magnet is moved toward a short helical coil of wire (solenoid) along the axis of the coil. The coil has 100 turns and the ends of the coil are connected to form a closed circuit. If the coil is replaced with a single loop of the same type of wire, and the magnet is moved exactly as before, the magnet experiences a force that is
A. repulsive and 100 times larger. B. attractive and 100 times larger. C. the same as before. D. attractive and 100 times smaller. E. repulsive and 100 times smaller.