Air expands adiabatically (no heat in, no heat out) from T = 300 K and P = 100 atm to a final pressure of 1 atm. Treat the gas as ideal with ? = 1.4, and determine the final temperature. Compare your result to the boiling points of nitrogen (77.4 K) and oxygen (90.2 K). Could this method result in the liquification of air?
80.5 K, some oxygen would liquify
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A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal. The projectile lands on a roof that is 4.0 m height. What is the distance along the horizontal axis when the projectile hits the roof?
A. 25.8 m B. 22.3 m C. 19.4 m D. 17.5 m E. 15.0 m
Two vectors A and B have components (0, 1, 2 ) and (-1, 3, 1), respectively
(a) Determine the components of the sum of these two vectors. (b) Determine the magnitude of the sum of these two vectors.
According to Wein's law, the wavelength of the peak energy will be ________ if the temperature of the blackbody is doubled
A) unchanged B) quadrupled C) doubled D) halved E) quartered
Astronaut Hans leaves Earth in a spaceship traveling at a speed of 0.280c relative to the observer Brian at rest on Earth. Hans is holding a pencil at an angle of 30° with the direction of travel, as seen by Hans
What angle does the pencil make with the direction of travel, as seen by Brian on Earth? A) 29° B) 30° C) 31° D) 33° E) 90°