State the cosmological principle
What will be an ideal response?
The universe is both homogeneous and isotropic on the grand scale.
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Camera Exposure: A lens of focal length 45 mm is mounted on a 35-mm camera. The lens aperture is set at f/2.0 and the shutter speed set at 1/2000 s. The photographer wants to keep the same exposure (amount of light), but wants to change the f-number to f/8.0 for greater depth of field. What should be the new shutter speed to maintain the same exposure?
A. 1/1000 s B. 1/500 s C. 1/4000 s D. 1/8000 s E. 1/125 s
A heat-conducting rod that is wrapped in insulation is constructed with a 0.15-m length of alloy A and a 0.40-m length of alloy B, joined end-to-end. Both pieces have cross-sectional areas of 0.0020 m2
The thermal conductivity of alloy B is known to be 1.8 times as great as that for alloy A. The end of the rod in alloy A is maintained at a temperature of 10°C, and the other end of the rod is maintained at an unknown temperature. When steady state flow has been established, the temperature at the junction of the alloys is measured to be 40° C, and the rate of heat flow in the rod is measured at 56 W. What is the temperature of the end of the rod in alloy B? A) 80°C B) 84°C C) 88°C D) 92°C E) 96°C
A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop
a. 79 ?T b. 69 ?T c. 59 ?T d. 89 ?T e. 9.4 ?T
Consider the events A, B, C, and D shown in the space time diagram below. What is the space time interval between events A and B?
A. 0 s
B. 2 s
C. 3 s
D. 4 s
E. 5 s
F. Other (specify)