Two circular loops are side by side and lie in the xy-plane. A switch is closed, starting a counterclockwise current in the left-hand loop, as viewed from a point on the positive z-axis passing through the center of the loop. Which of the following statements is true of the right-hand loop?
1.The current remains zero.
2.An induced current moves counterclockwise.
3.An induced current moves clockwise.
2
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Two stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 2 RB, and TA = 0.5 TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time?
a. Star A b. Star B c. Both radiate the same amount of energy per unit time. d. More information is needed in order to make a determination.
Which requires the most amount of work by the brakes of a car?
A) slowing down from 100 km/h to 70 km/h B) slowing down from 70 km/h to a stop C) equal amounts for both
The bathyscaphe Trieste consists of a thin-walled but very strong cylindrical hull, 15.2 m long and 3.66 m in diameter,
filled with gasoline with a density of 880 kg/m3 to make it buoyant. If it is totally submerged in seawater with a density of 1025 kg/m3 and neither rising nor sinking, what is the weight of the Trieste craft? A) 127 kN B) 227 kN C) 327 kN D) 427 kN E) 527 kN
Polarization: Unpolarized light passes through three ideal polarizing filters. The first filter is oriented with a horizontal transmission axis, the second one has its transmission axis at 30° from the horizontal, and the third filter has a vertical transmission axis. What percent of the light gets through this combination?
A. 9.4% B. 91% C. 50% D. 0% E. 33%