If the temperature of an ideal gas is increased from 20°C to 40°C, by what percent does the speed of the molecules increase?
A) 3%
B) 30%
C) 70%
D) 100%
A
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A source emits sound at a fixed constant frequency f.If the temperature of the air rises, the frequency you hear is
a. the same as f. b. higher than f. c. lower than f. d. unrelated to f.
It is desired to project an image of an object four times actual size with a lens of focal length 20 cm. What object distance should be used?
A) 100 cm B) 80 cm C) 4 cm D) 25 cm E) 5 cm
An electron microscope operates with electrons of kinetic energy 100 keV. What is the wavelength of these electrons? Assume this speed is not relativistic. (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^-19 J, and me = 9.11 × 10^-31 kg)
a. 5.49 × 10^-12 m c. 9.28 × 10^-10 m b. 7.14 × 10^-11 m d. 3.88 × 10^-12 m
to determine the Nusselt number and heat transfer coefficient for the conditions given in.
GIVEN
• A long cylinder immersed in a fluid
• Diameter (D) = 0.1 m
• Surface temperature (Ts) = 400 K
• Fluid temperature (T?) = 350 K
FIND
The Nusselt number (Nu) and heat transfer coefficient (hc) for each fluid
SKETCH
PROPERTIES AND CONSTANTS
