A comet is traveling at a speed of 50,000 mi/h when it is 100 million miles from the Sun. Compute its speed when it is 25 million miles from the Sun
200,000 mi/h
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In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance d from the wire. To measure a field of 5 mT due to this wire, you would have to go to a distance from the wire of
A) 16d. B) 8d. C) 4d. D) 2d. E) d .
When two or more different capacitors are connected in parallel across a potential source (battery), which of the following statements must be true? (There could be more than one correct choice.)
A) The potential difference across each capacitor is the same. B) The capacitor with the largest capacitance has the largest potential difference across it. C) The equivalent capacitance of the combination is less than the capacitance of any one of the capacitors. D) Each capacitor carries the same amount of charge. E) The capacitor with the largest capacitance has the most charge.
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 current induced in the loop is
A. zero in both cases. B. 100 times larger. C. 100 times smaller. D. the same as in the coil.