The Russian ________ probes are the only ones to successfully land on Venus
Fill in the blank(s) with correct word
Venera
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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
A 100 kg mass is blown apart into a 60 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The velocity of the 60 kg mass is
A. 88 m/s. B. 67 m/s. C. 51 m/s. D. 40 m/s. E. 24 m/s.
The following reaction is used to make the polymer described below. What is the other starting material?
A) HOCH2CH2OH B) H2O C) HOCH2CH3 D) H2CI=CH2 E) HOCH2CH2CH2CH2OH
How many types of fundamental particles exist?
A.) 6. B.) 12. C.) 24. D.) 30. E.) 300.