The color force between quarks is carried by __________
Fill in the blank(s) with correct word
gluons
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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)
Angular Momentum: A 24.5-kg child is standing on the outer edge of a horizontal merry-go-round that has a moment of inertia of 989 kg ? m2 about a vertical axis through its center and a radius of 2.40 m. The entire system (including the child) is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to a new position 1.10 m from the center of the merry-go-round.
Fill in the blank(s) with the appropriate word(s).
Why is the regolith light-colored in the highlands, while darker in the maria?
A. The highland regions receive more sunlight than the maria. B. The highland regolith is younger, and therefore lighter in color. C. Lunar regolith is the same color everywhere, but the maria reflect less light. D. The regolith in the maria has a different mineral composition.
In simple harmonic motion, the restoring force must be proportional to the:
A. amplitude B. frequency C. velocity D. displacement E. displacement squared