A battery is used to light a bulb as shown. An identical battery is connected by closing switch S. What happens to the bulb?
1.The bulb goes out.
2.The bulb gets noticeably dimmer.
3.The bulb gets very slightly dimmer.
4.The bulb's brightness stays the same.
5.The bulb gets slightly brighter.
6.The bulb gets noticeably brighter.
7.A combination of 2 of the answers above; first one happens, then the other.
4
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A buried power cable as described in Example Problem 3-15, is 0.46 inches in diameter and is 3 feet below grade. The cable will be expected to transmit 1200 amperes at 440 volts. Estimate the equilibrium temperature.
What will be an ideal response?
The galactic center lies in the direction of which constellation?
A) Orion B) Leo C) Taurus D) the Big Dipper E) Sagittarius
The current flowing through a circuit is changing at a rate of 6.0 A/s. If the circuit contains a 190-H inductor, what is the emf across the inductor?
A) 1100 V B) 11 mV C) 32 mV D) 32 V
Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star #1 b. Both stars will have the same shift. c. The value of the speed must be known before an answer can be found. d. star #2