A certain amount of a monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done by the gas?
A) 200 J
B) -200 J
C) 400 J
D) zero
E) -400 J
D
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Suppose the surface temperature of the Sun were about 18,000 K, rather than 6,000 K. How much more thermal radiation would the Sun emit? How would the thermal radiation spectrum of the Sun be different?
What will be an ideal response?
A centrifuge in a medical laboratory rotates at a rotational speed of 3600 rev/min. When switched off, it makes 50 complete turns at a constant angular acceleration before coming to rest
(a) What was the magnitude of the angular acceleration of the centrifuge as it slowed down? (d) How long did it take for the centrifuge to come to rest after being turned off?
How many moles of water (H2O) molecules are in a 4.00 m3 container at a pressure 8.00 × 105 N/m2 and temperature 600°C? The ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K
A) 641 mol B) 7.72 × 1026 mol C) 2.65 × 1026 mol D) 3.86 × 1026 mol E) 441 mol
Since Mars is 1.5 AU from the Sun, how long would it take for sunlight to reach the surface of Mars?
a. 4 min b. 8 min c. 12 min d. 1 hr e. 4 hr