A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle. How much heat does it exhaust in each cycle?
A. zero
B. 52.5 J
C. 97.5 J
D. 150 J
C. 97.5 J
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A sphere 0.1-m-diameter is rotating at 20 rpm in a large container of CO2 at atmospheric pressure. If the sphere is at 60°C and the CO2 at 20°C, estimate the rate of heat transfer.
GIVEN
? A rotating sphere in carbon dioxide at atmospheric pressure
? Diameter (D) = 0.1 m
? Speed of rotation (?) = 20 rev/min
? Sphere temperature (Ts) = 60°C
? CO2 temperature (T?) = 20°C
FIND
? The rate of heat transfer
ASSUMPTIONS
? Steady state conditions
? The carbon dioxide is still
? Radiation is negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for CO2 at the mean temperature of 40°C
Phase changes occur
A) as the temperature decreases. B) as the temperature increases. C) as the temperature remains the same. D) all of the above E) none of the above
A steel cable spanning a river is 200.000 m long when the temperature is 20.°C. What will be its length when the temperature drops to 0°C? (The coefficient of thermal expansion of steel is 12. × 10-6K-1.)
What will be an ideal response?
At a certain instant, a proton is moving in the positive x direction through a magnetic field in the negative z direction. What is the direction of the magnetic force exerted on the proton?
1.positive z direction 2.negative z direction 3.positive y direction 4.negative y direction 5.The force is zero.