A star that is 70 percent the mass of our Sun would have a habitable zone that:
A. includes Jupiter and its moons
B. includes Venus but not the Earth
C. includes both Jupiter and Saturn and their moons
D. includes Mars but not the Earth
E. includes both Mars and the Earth
Ans: B. includes Venus but not the Earth
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A 320-g air track cart traveling at 1.25 m/s collides elastically with a stationary 270-g cart. What is the speed of the 320-g cart after the collision?
A) 0.678 m/s B) 0.106 m/s C) 0.212 m/s D) 1.36 m/s E) 1.14 m/s
Determine the maximum heat transport through a heat pipe having an effective length of 2 meters and an effective nickel powder wick area of 20 cm2 if the pipe is operating at 800 K.
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Engine oil at 100°C flows over and parallel to a flat surface at a velocity of 3 m/s. Calculate the thickness of the hydrodynamic boundary layer at a distance 0.3 m from the leading edge of the surface.
GIVEN
Engine oil flows over a flat surface
Engine oil temperature (Tb) = 100°C
Engine oil velocity (U) = 3 m/s
FIND
The hydrodynamic boundary layer thickness (?) at a distance 0.3 m from the leading edge
ASSUMPTIONS
Steady state
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 17, for engine oil at 100°C
Kinematic viscosity (v) = 20.3 ? 10–6 m2/s