What types of mirrors always produce upright images?
A. Converging and plane
B. Diverging and plane
C. Converging and diverging
D. The image from all types of mirrors is always upright.
Ans: B. Diverging and plane
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Two circular coils of diameter 30.0 cm are parallel to each other and have their centers along the same line L but separated by 22.0 cm. When an experimenter views the coils along L, the coil closer to her carries a clockwise current of 2.50 A
Find the magnitude and sense (clockwise or counterclockwise) of the current needed in the other coil so that the net magnetic field on L midway between the two coils will have a magnitude of 4.10 µT and point away from the experimenter who is viewing the coils along L. (?0 = 4? × 10-7 T ? m/A)
A hydrogen atom is excited to the n = 11 level. Its decay to the n = 7 level is detected in a photographic plate. What is the wavelength of the light photographed? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 7,510 nm B) 4,670 nm C) 12,400 nm D) 4,380 nm
This graph shows how the time dilation factor (t?/t) depends on the speed of an object moving by you. How fast does an object have to be moving for you to see its time running about 20% slower than normal (about 80% of normal)?
A) 0.6c B) 0.2c C) 0.8c D) None of the choices are correct; time must be the same for everyone.
At what rate is thermal energy generated in the 30-? resistor?
A. 20 W B. 27 W C. 60 W D. 13 W E. 30 W