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Answer the following statement true (T) or false (F)
True
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In Figure 4.2, the applied force F equals 150 N. The force in link B is closest to:
A) 54 N B) 56 N C) 58 N D) 60 N E) 62 N
A car and a large truck traveling at the same speed collide head-on and stick together. Which vehicle undergoes the larger change in the magnitude of its momentum?
1.the car 2.the truck 3.the change in the magnitude of momentum is the same for both 4.impossible to determine without more information
Which of the following are not relativistically invariant quantities?
a. the speed of light, c b. time c. mass d. energy
A journal bearing has a clearance of 0.5 mm. The journal has a diameter of 100 mm and rotates at 3600 rpm within the bearing. The journal is lubricated by an oil having a density of 800 kg/m3 , a viscosity of 0.01 kg/(ms), and a thermal conductivity of 0.14 W/(m K). Both the journal and the bearing temperatures are maintained at 60°C. Calculate the rate of heat transfer from the bearing and the power required for rotation per unit length.
GIVEN
A journal bearing
Diameter (D) = 100 mm = 0.1 m
Clearance (H) = 0.5 mm = 0.0005 m
Rotational speed (@) = 3600 rpm
Oil properties
? Density (p) = 800 kg/m3
? Viscosity (?) = 0.01 kg/(ms)
? Thermal conductivity (k) = 0.14 W/(m K)
Temperature of both surface (Tb) = 60°C
FIND
(a) The rate of heat transfer from the bearing
(b) The power required for rotation per unit length
ASSUMPTIONS
Steady state
Uniform and constant surface temperatures
Constant fluid properties
SKETCH
