1. (2 points) An example of correct units of specific weight are a) kg/m3 b) slu
ID: 1765660 • Letter: 1
Question
1. (2 points) An example of correct units of specific weight are a) kg/m3 b) slug/ft c) lb/ft 2. (2 points) A "no-slip" condition implies: a) fluid sticks to solid boundaries b) there is no velocity gradient c) the fluid is dense 3. (2 points) When a fluid is said to be Newtonian, it means: a) the fluid is viscous b) hydrostatic forces are at a minimum c) shearing stress is linearly related to the rate of strain 4. (2 points) A pot of water at high altitudes will boil at at sea level than a pot of water a) a lower temperature b) a higher temperature c) the same temperature 5. (2 points) When dealing with surface tension, the angle of contact for wateragainst clean glass can be assumed to be a) undeterminable b) near zero c) proportional to density 6. (2 points) When you measure the pressure in your cars tires, that is: a) gage pressure b) absolute pressure 7. (2 points) When the weather report says the barometric pressure is 30 inches of Mercury, that is: a) gage pressure b) absolute pressureExplanation / Answer
Answer 1- (c) lb/ft3
Specific Weight is defined as weight per unit volume. Weight is a force. The SI unit for specific weight is [N/m3]. The imperial unit is [lb/ft3].
Answer 2- (a) the fluid is viscous
the no-slip condition for viscousfluids assumes that at a solid boundary, the fluid will have zero velocity relative to the boundary
Answer 3- (c) shearing stress is linearly related to rate of strain
Newtonian fluid obey Newton viscosity relation that is shearing stress is linearly related to rate of strain.
Answer 4- (a) a lower temperature
water boils at a lower temperature at higher elevations
Answer 5- (b) near zero
For pure water and perfectly clean glass, the angle of contact is 0°.
Answer 6- (a) gage pressure
pressue in tire is gage pressure.
Answer 7- (b) absolute pressure
A barometer is a device that measures atmospheric pressure. This device measures atmospheric pressure, rather than gauge pressure,
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