Reactance: What is the reactance of a 20-mH inductor at a frequency of 60 Hz?
A. 7.5 ?
B. 0.13 ?
C. 1.2 ?
D. 1.2 m?
E. 7.5 m?
Answer: A
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Find the change in entropy (in J/K) when 5.00 moles of an ideal monatomic gas are allowed to expand isobarically from an initial volume of 20 cm3 to a final volume of 100 cm3.
A. 167 B. 100 C. 67 D. 52 E. 152
Answer the following statement(s) true (T) or false (F)
The direction of the net force on a small magnet will be the same if the SG axis is reversed and the effect of the external magnet decreases in the axis direction instead of increasing.
We can learn a lot about the properties of a star by studying its spectrum. All of the following statements are true except one. Which one?
A) The peak of the star's thermal emission tells us its temperature: Hotter stars peak at shorter (bluer) wavelengths. B) The total amount of light in the spectrum tells us the star's radius. C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals. D) We can look at Doppler shifts of spectral lines to determine the star's speed toward or away from us.
When a 4-cubic-ft block of wood floats in a fluid whose weight density is 60 pounds per cubic foot, 3/4 of the block's volume is submerged. The buoyant force on the block is __________
Fill in the blank(s) with correct word