1.0 micrometer equals _____________ millimeters.
a. 
b. 
c. 
d. 
b.
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Oil c p2.1 kJ/(kg K) is used to heat water in a shell and tube heat exchanger with a single shell and two tube passes. The overall heat transfer coefficient is 525 W/(m2 K). The mass flow rates are 7 kg/s for the oil and 10 kg/s for the water. The oil and water enter the heat exchanger at 240°C and 20°C, respectively. The heat exchanger is to be designed so that the water leaves the heat exchanger with a minimum temperature of 80°C. Calculate the heat transfer surface area required to achieve this temperature.
GIVEN
• Oil heats water in a heat exchanger with one shell pass and two tube passes
• Oil specific heat (cpo) = 2.1 kJ/(kg K) = 2100 J/(kg K)
• Overall heat transfer coefficient (U) = 525 W/(m2 K)
• Oil mass flow rate m o= 7 kg/s
• Water mass flow rate m w= 10 kg/s
• Inlet temperatures: Oil (To,in) = 240° Water (Tw,in) = 20°C
• Minimum water outlet temperature (Tw,out) = 80°C
FIND
• The heat transfer area (A) required
ASSUMPTIONS
• Oil is in the tubes
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water at the average temperature of 50°C (cpw)= 4178 J/(kg K)
What is the ratio of the relativistic momentum to the classical momentum?
a. 
b. 
c. 
d. 
e. 
Three identical 3.0-kg cubes are placed on a horizontal surface in contact with one another. The cubes are lined up from left to right and an 18-N force is applied to the left side of the left cube causing all three cubes to accelerate to the right. If the cubes are each subject to a frictional force of 3.0 N, what is the magnitude of the force exerted on the right cube by the middle cube in this
case? a. 18 N c. 12 N b. 6 N d. none of the above
As a 6 solar-mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) remains roughly constant. B) decreases. C) first increases, then decreases. D) increases. E) first decreases, then increases.