Rising air expands and cools. The rate of cooling depends on
A) the air's moisture content.
B) the dry adiabatic lapse rate.
C) the energy of the water-vapor molecules.
D) temperature inversions.
Answer: A
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At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
A) 45° B) 30° C) 0° D) 90° E) ? radians
The temperature of a 100 m diameter cooling pond is 7°C on a winter day. If the air temperature suddenly drops to –7°C, calculate the thickness of ice formed after three hours.
GIVEN
? A round cooling pond on a winter day
? Initial temperature (Tl) = 7°C
? Air temperature (T?) drops to –7°C
? Pond diameter (D) = 100 m
FIND
? The thickness of ice (?) formed after 3 hours
ASSUMPTIONS
? The thermal capacitance of the ice layer is negligible
? Radiative heat transfer is negligible
? Bulk water temperature remains constant at 7°C
? Air temperature is constant at –7°C
? The air and water are still
SKETCH
PROPERTIES AND CONSTANTS
The ice property values given in the problem statement of Problem 9.37 is
Extrapolating from Appendix 2, Table 28, for dry air at the estimated film temperature of –3.5°C
From Appendix 2, Table 13, for water at the estimated film temperature of 3.5°C
You chemically analyze a small sample of a meteorite. K-40 and Ar-40 are present in a ratio of approximately 1.65 units of K-40 atoms to 8.35 units of gaseous Ar-40 atoms
How old is the meteorite given the half-life of this decay is 1.25 billion years? A) 1.25 billion years B) 5.00 billion years C) 2.75 billion years D) 3.25 billion years
Three boxes are pushed across a frictionless horizontal surface as shown. When we compare the normal force 
that mass 2m exerts on mass 5m with the normal force 
that mass 5m exerts on mass 10m, we find that
?
?
A.
= = F.B.
= F> .C.
= .D.
> .E.
> .?