You lift a 1 kg object [weight on Earth = 10 N] by 1 m. By about how much does the object's mass increase?
A) 10-12 kg
B) 0.01 kg
C) 10-16 kg
D) 10-14 kg
E) Its mass doesn't change at all.
C
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The equilibrium interatomic separation between two atoms is determined by setting the derivative of the interatomic pair potential with respect to separation equal to ______________.
Fill in the blank(s) with the appropriate word(s).
Atmospheric air at a velocity of 61 m/s and a temperature of 16°C enters a 0.61-m-long square metal duct of 20 × 20 cm cross section. If the duct wall is at 149°C, determine the average heat transfer coefficient. Comment briefly on the L/Dh effect.
GIVEN
Atmospheric air flow through a square metal duct
Air velocity (V) = 61 m/s
Inlet air temperature (Tb,in) = 16°C
Duct dimensions: 20 cm × 10 cm × 0.61 m = 0.2 m × 0.2 m × 0.61 m
Duct wall surface temperature (Ts) = 149°C
FIND
The average heat transfer coefficient (c h)
ASSUMPTIONS
Steady state
Constant and uniform wall surface temperature
SKETCH
Evidence that there is a considerable amount of water frozen under the surface of Mars is provided by all of the following except
A. satellite measurements of water in the polar caps. B. discovery by the Mars rovers of chemicals in surface rocks formed in the presence of large amounts of water. C. squishy-looking flow patterns around crater impact sites. D. features resembling channels cut by flowing water. E. periodic eruptions of geysers when subsurface ice is melted by volcanic activity.
Emission nebulae are created by gas absorbing ultraviolet energy from the hot young stars within them, such as in the Orion Nebula
Indicate whether the statement is true or false