An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 59°F (15°C) and the temperature well below the surface is 41°F (5°C)?
a. 3.5%
b. 67%
c. 31%
d. 17%
e. 96%
a
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The wavelength of an x-ray is between
(a) 10 and 100 nm (b) 1 and 10 nm (c) 0.1 to 1 nm (d) 0.01 and 0.1 nm
Ideal Gas Law: A 3.9-L volume of ideal neon gas (monatomic) is at a pressure of 5.6 aym and a temperature of 330 K. The atomic mass of neon is 20.2 g/mol. The temperature of the gas is now increased to 430 K and the volume is increased to 5.9 L. What is the final pressure of the gas?
A. 4.8 atm B. 4.3 atm C. 5.3 atm D. 5.8 atm E. 6.3 atm
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 4.00 m height. What is the speed when the projectile hits the roof?
A. 19.2 m/s B. 17.9 m/s C. 12.5 m/s D. 9.20 m/s E. 8.40 m/s
A square loop (length along one side = 20 cm) rotates in a constant magnetic field which has a magnitude of 2.0 T. At an instant when the angle between the field and the normal to the plane of the loop is equal to 20° and increasing at the rate of 10°/s, what is the magnitude of the induced emf in the loop?
a. 13 mV b. 0.27 V c. 4.8 mV d. 14 mV e. 2.2 mV