We are measuring the spectra of two hydrogen gas clouds. The laboratory frame wavelength of one hydrogen line is 656.2 nm. Cloud A's emission line wavelength is 660.1 nm and Cloud B's emission line wavelength is 670.1 nm
What can we conclude about these clouds?
A) They are both approaching us, and Cloud A is approaching faster than Cloud B.
B) They are both receding from us, and Cloud B is receding faster than Cloud A.
C) They are both approaching us, and Cloud B is approaching faster than Cloud A.
D) They are both receding from us, and Cloud A is receding faster than Cloud B.
B
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Three couples of equal magnitude (M0 5 100 N?m) are applied as shown. A single couple (in N?m) that is statically equivalent to the three couples is:
(A) 83.2i 2 89.4j
(B) 283.2i 1 89.4j
(C) 93.2i 1 79.4j
(D) 83.2i 1 89.4j
What is the hardness of diamond on the Mohs scale?
a. 1 b. 4 c. 7 d. 10
Carnot Engine: An ideal Carnot engine is operated between a hot and a cold reservoir. The temperature difference between the two reservoirs is 284°C. If the efficiency of this ideal engine is 24.0%, find the temperature of the cold reservoir in degrees Celsius.
Fill in the blank(s) with the appropriate word(s).
What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
a. the rapid outward flow of gas
b. the rapid inward flow of the gas
c. the high temperature of the gas
d. the high density of the gas
e. the high temperature and the high density of the gas