Viewed from afar, the transit of Earth would cause the Sun's brightness to dim by approximately
A) 10%.
B) 5%.
C) 1%.
D) 0.00001%.
E) 0.01%.
E) 0.01%.
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About how old was the universe when the microwave background radiation that Penzias and Wilson discovered first became visible?
a. 1 microsecond (10^-6 second) when the electromagnetic force separated out from the electroweak force. b. 3 minutes, the start of the period that ended with typical photons unable to produce electron-positron pairs. c. 300 thousand years, when matter in the universe became transparent to photons. d. 1 million years, when the strong force separated out. e. 30 million years, when the strong force separated out.
A small airplane with a wing span of 12 m flies horizontally and due north at a speed of 60 m/s in a region where the magnetic field of the earth is 60 ?T directed 60° below the horizontal. What is the magnitude of the induced emf between the ends of the wing?
a. 50 mV b. 31 mV c. 37 mV d. 44 mV e. 22 mV
A microscope has an objective lens with an aperture diameter 0.60 cm. A monochromatic light source of wavelength 580 nm is used to illuminate the object. It is determined that the minimum angle of resolution is 1.18 × 10^-4 rad. If the present lens were replaced by one with an aperture of diameter 1.0 cm, what would the minimum angle of resolution now become? (1 nm = 10-9 m)
a. 1.5 × 10^-4 rad c. 0.71 × 10^-4 rad b. 0.79 × 10^-4 rad d. 1.8 × 10^-4 rad
A T-shaped simple beam has a cable with force P anchored at B and passing over a pulley at E, as shown in the figure. The bending moment just left of C is 1.25 kN?m. The cable force P is approximately:
(A) 2.7 kN
(B) 3.9 kN
(C) 4.5 kN
(D) 6.2 kN
