In a nuclear plant, 1017 J of energy is available from mass conversion. How much mass of fuel was lost to produce this energy? (c = 3.0 × 108 m/s)
A) 0.1 kg
B) 1 kg
C) 10 kg
D) 100 kg
B
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If a star were moved 10 times farther away, its apparent magnitude would drop by five magnitudes
Indicate whether the statement is true or false
Estimate the rate of heat loss per unit length from a 5 cm ID, 6 cm OD steel pipe covered with high temperature insulation having a thermal conductivity of 0.11 W/(m K) and a thickness of 1.2 cm. Steam flows in the pipe. It has a quality of 99% and is at 150°C. The unit thermal resistance at the inner wall is 0.0026 (m2 K)/W, the heat transfer coefficient at the outer surface is 17 W/(m2 K), and the ambient temperature is 16°C.
GIVEN
Insulated, steam filled steel pipe Diameters
? ID of pipe (Di) = 5 cm=0.05 m
? OD of pipe (Do) = 6 cm=0.06 m Thickness of insulation (Li) = 1.2 cm=0.012 m Steam quality = 99% Steam temperature (Ts) = 150°C Unit thermal resistance at inner wall (A Ri) = 0.026 (m2 K)/W Heat transfer coefficient at outer wall (ho) = 17 W /(m2 K) Ambient temperature (T ) = 16°C Thermal conductivity of the insulation (kI) = 0.11 W /(m K)
FIND
Rate of heat loss per unit length (q/L)
ASSUMPTIONS
1% carbon steel Constant thermal conductivities Steady state conditions
SKETCH
Carnot Engine: An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at 1.76 K has an efficiency of 11.0%. What is the temperature of the warm reservoir?
A. 1.98 K B. 0.180 K C. 157 K D. 0.160 K
A Venturi tube may be used as the inlet to an automobile carburetor. If the inlet pipe of 2.0-cm diameter narrows to 1.0-cm diameter, what is the pressure drop in the constricted section for airflow of 4.0 m/s in the 2-cm section? (Assume air density is 1.25 kg/m3.)
a. 70 Pa c. 100 Pa b. 84 Pa d. 150 Pa