The lowest energy level of a certain quantum harmonic oscillator is 5.00 eV. What is the energy of the next higher level?
A) 15.0 eV B) 7.50 eV C) 10.0 eV D) 50.0 eV E) 20.0 eV
A
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You stand by the railroad tracks as a train passes by. You hear a 1 020-Hz frequency when the train approaches, which changes to 760 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s
a. 30.2 m/s b. 34.5 m/s c. 40.1 m/s d. 49.7 m/s e. 45.6 m/s
Constant Angular Acceleration: A turntable 45 cm in diameter starts from rest and makes its first complete revolution in 3.4 s with constant angular acceleration. If it maintains the same acceleration, how long will it take the turntable to make its second complete revolution?
Fill in the blank(s) with the appropriate word(s).
If the scattering angle of the light in Compton's scattering experiment is 90°, what is the change in the wavelength of the light?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.22 × 10-12 m B) 2.42 × 10-12 m C) 3.65 × 10-12 m D) 4.85 × 10-12 m
Mercury flows inside a copper tube 9 m long with a 5.1 cm inside diameter at an average velocity of 7 m/s. The temperature at the inside surface of the tube is 38°C uniformly throughout the tube, and the arithmetic mean bulk temperature of the mercury is 66°C. Assuming the velocity and temperature profiles are fully developed, calculate the rate of heat transfer by convection for the 9 m length by considering the mercury as (a) an ordinary liquid and (b) liquid metal. Compare the results.
GIVEN
FIND
The rate of heat transfer for the 9 m length considering mercury as
(a) an ordinary liquid, and
(b) a liquid metal
ASSUMPTIONS
Steady state
Fully developed flow
SKETCH
PROPERTIES AND CONSTANTS
for mercury at the bulk temperature of 66°C
