Suppose that the light from the sun suddenly shut off all over the sun, precisely at noon, as measured by clocks placed near the sun. Viewed from Earth, how would this appear? (HINT: It is about 8 light-minutes to the sun.)
A) Nothing unusual would happen, as viewed from Earth.
B) At noon, all sunlight would suddenly cease.
C) At about 8 minutes past noon, all sunlight would suddenly cease.
D) After about 8 minutes, the sun would turn into Daffy Duck.
E) At about 8 minutes past noon a small black spot would appear in the center of the sun, and this black spot would rapidly spread out over the entire sun.
E
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RMS and Peak Quantities: A 0.150-kW lamp is plugged into a 120-V ac wall outlet. What are (a) the peak current through the lamp, (b) the rms current through the lamp, and (c) the resistance of the lamp?
What will be an ideal response?
Steel blocks A and B, which have equal masses, are at TA = 300 °C and TB = 400 °C. Block C, with mC = 2mA, is at TC = 350 °C. Blocks A and B are placed in contact, isolated, and allowed to come into equilibrium. Then they are placed in contact with block C. At that instant,
a. TA = TB < TC. b. TA = TB = TC. c. TA = TB > TC. d. TA + TB = TC. e. TA ? TB = TC.
Using the correct answer from Part B, calculate the volume of a rectangular prism with a length of 5.6 cm, a width of 2.1 cm, and a height of 6.6 cm.
The equivalent resistance of any series of resistors in a circuit is
A) often less than the resistance of the lowest resistor. B) always less than the resistance of the lowest resistor. C) usually half the value of the lowest resistor. D) none of the above