A thermodynamic engine with an efficiency of 30% performs 2500 J of work. How much thermal energy is discharged to the lower temperature reservoir?
A) 5800 J
B) 8300 J
C) 750 J
D) 1400 J
E) 7100 J
A
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The following equation has been proposed for the heat transfer coefficient in natural convection from long vertical cylinders to air at atmospheric pressure:
Where Tf = the film temperature = 1/2 (Ts + T?) and Tf is in the range 0 to 200°C The corresponding equation in dimensionless form is
Compare the two equations, to determine those values of C, m and n in the second
equation that will give the same results as the first equation.
GIVEN
Empirical equations shown above
FIND
Values of C, m and n
ASSUMPTIONS
Air behaves as an ideal gas
A swimming area in a rotating space habitat is located in a region of 1/4 g. If a diver can jump 1 m high in a 1-g region, how high can the same diver jump in the swimming area?
A) 1 m B) 2 m C) 4 m D) 16 m E) more than 16 m
A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?
A) 90 mA B) 1.0 A C) 5.0 A D) 11 A E) 14 A
A galvanometer has a coil with a resistance of 24.0 ?. A current of 180 ?A causes full-scale deflection. If the galvanometer is to be used to construct an ammeter that deflects full scale for 10.0 A, what shunt resistor is required?
A) 123 ?? B) 234 ?? C) 342 ?? D) 432 ?? E) 423 ??