A farmer is using a tank of 20°C nitrogen pressurized to 540 kPa absolute. It exits the tank out a hose. The hose snaps and the farmer is hit with the expanding nitrogen. Air is primarily nitrogen so assuming it is air flowing with no losses, the temperature of the exiting nitrogen is nearest:
(A) ?120°C
(B) ?90°C
(C) ?70°C
(D) ?50°C
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Total Internal Reflection: A light beam with wavelength 440 nm in a certain material then enters air and its wavelength becomes 577 nm.(a) What is the index of refraction for the material?(b) At what angle with the plane of the surface will the light be totally reflected back into the material?
Fill in the blank(s) with the appropriate word(s).
A rocket with a mass of 500 grams is launched straight up. It achieves a velocity of 20.0 m/s in 2.00 seconds. The average thrust force of the engines on the rocket is
A. 7.50 N. B. 9.90 N. C. 12.0 N. D. 13.5 N. E. 20.0 N
Two harmonic sound waves reach an observer simultaneously. The observer hears the sound intensity rise and fall with a time of 0.200 s between the maximum intensity and the succeeding minimum intensity
What is the difference in frequency of the two sound waves? A) 10.0 Hz B) 0.200 Hz C) 5.00 Hz D) 2.50 Hz E) 1.25 Hz
Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires?
a. 72 ?T b. 48 ?T c. 24 ?T d. 96 ?T e. 32 ?T