A hose has been clamped so that the area at the clamp is only one quarter the area of the rest of the hose. When we ignore the viscosity of water, the ratio of the speed of the water through the clamped area to the speed of the water when it leaves the hose is
A.
.B.
.C.
D.
E.
Answer: E
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__________ refers to turning motion around a body's axis whereas ___________ refers to motion of a body around a point
Fill in the blank(s) with correct word
If a barometer were to be made using water as the liquid instead of mercury, the length of the barometer tube for water would be ________ than the tube for a standard mercury barometer.
What will be an ideal response?
The experimental data shown tabulated were obtained by passing n-butyl alcohol at a bulk temperature of 15°C over a heated flat plate (0.3-m-long, 0.9-m-wide, surface temperature of 60°C). Correlate the experimental data using appropriate dimensionless numbers and compare the line which best fits the data with Equation 5.38.
GIVEN
n-butyl alcohol flowing over a heated flat plate
Bulk temperature (Tb) = 15°C
Plate surface temperature (Tp) = 60°C
Plate length (L) = 0.3 m
Plate width (w) = 0.9 m
The experimental data given above
FIND
(a) Correlate the data by appropriate dimensionless numbers
(b) Compare line which best fits the data with Equation 5.38
ASSUMPTIONS
Steady state
Alcohol flows parallel to the length of the plate
Plate temperature is uniform
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 19: For n-butyl alcohol at the average of the bulk and surface temperatures
(known as the film temperature): 37.5°C.
The air at the beach is the same temperature everywhere, but you feel cooler under a beach umbrella because
A. solar radiation is not heating up your skin. B. the sand underneath you cools off more rapidly than the water vapor in the air. C. the umbrella gets hot, which thereby cools off the air underneath it. D. a convection cell forms under the umbrella, thereby cooling you off.