The beat frequency produced when a 240-hertz tuning fork and a 246-hertz tuning fork are sounded together is
A) 6 hertz.
B) 12 hertz.
C) 240 hertz.
D) 245 hertz.
E) none of the above
Answer: A
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What is the total internal energy of 2.00 moles of an ideal gas at -50
C?
A. 4,040 J B. 4,750 J C. 5,020 J D. 5,560 J E. 6,030 J
Energy Conservation With Conservative Forces: When you throw a pebble straight up with initial speed V, it reaches a maximum height H with no air resistance. At what speed should you throw it up vertically so it will go twice as high?
A. 16V
B. 8V
C. 4V
D. 2V
E. 
V
Rotational Kinetic Energy: A futuristic design for a car is to have a large flywheel within the car to store kinetic energy. The flywheel is a solid uniform disk of mass 370 kg with a radius of 0.50 m, and it can rotate up to 200 rev/s. Assuming all of this stored kinetic energy could be transferred to the linear speed of the 1500-kg car, find the maximum attainable speed of the car.
Fill in the blank(s) with the appropriate word(s).
Heat is transferred at a rate of 0.1 kW through glass wool insulation (density = 100 kg/m3 ) with a 5 cm thickness and 2 m2 area. If the hot surface is at 70°C, determine the temperature of the cooler surface.
GIVEN
• Glass wool insulation with a density (?) = 100 kg/m3
• Thickness (L) = 5 cm = 0.05 m
• Area (A) = 2 m2
• Temperature of the hot surface (Th) = 70°C
• Rate of heat transfer (qk) = 0.1 kW = 100 W
FIND
• The temperature of the cooler surface (Tc)
ASSUMPTIONS
• One dimensional, steady state conduction
• Constant thermal conductivity
SKETCH
PROPERTIES AND CONSTANTS
The thermal conductivity of glass wool at 20°C (k) = 0.036 W/(m K)