The fundamental source of energy released by a tropical hurricane comes from
A) the trade winds.
B) the Sun.
C) warm moist air.
D) the convergence of maritime polar and maritime tropical air masses.
Answer: C
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Suppose that a lone asteroid happens to be passing Jupiter on an unbound orbit (well above Jupiter's atmosphere and far from all of Jupiter's moons.) Which of the following statements would be true?
A) The asteroid's orbit around Jupiter would not change, and it would go out on the same unbound orbit that it came in on. B) Jupiter's gravity would suck in the asteroid, causing it to crash into Jupiter. C) Jupiter's gravity would capture the asteroid, making it a new moon of Jupiter. D) There is no way to predict what would happen.
A journal bearing is idealized as a stationary flat plate and a moving flat plate that moves parallel to it. The space between the two plates is filled by an incompressible fluid. Consider such a bearing with the stationary and moving plates at 10°C and 20°C respectively, the distance between them is 3 mm, the speed of the moving plate is 5 m/s, and there is engine oil between the plates.
(a) Calculate the heat flux to the upper and lower plates
(b) Determine the maximum temperature of the oil.
GIVEN
Journal bearing: Two flat plates, one stationary, one moving with oil between them
Stationary plate temperature (Ts) = 10°C
Moving plate temperature (Tm) = 20°C
Distance between plate (H) = 3 mm = 0.003 m
Speed of the moving plate (Up) = 5 m/s
FIND
(a) Heat flux (q/A) for the plates
(b) The maximum temperature of the oil
ASSUMPTIONS
Steady state
Constant physical properties
Negligible edge effects
Oil is incompressible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 17, for engine oil at 15°C
Thermal conductivity (k) = 0.145 W/(m K)
Absolute viscosity (?) = 1.561 (Ns)/m2
Prandtl number (Pr) = 196
Kirchhoff's Rules: For the circuit shown in the figure, write the Kirchhoff loop equation for the entire outside loop. Notice the directions of the currents!
What will be an ideal response?
The mass of the Sun is 2.0 × 10^30 kg, and the mass of a hydrogen atom is 1.67 × 10^-27 kg. If we assume that the Sun is mostly composed of hydrogen, how many atoms are there in the Sun?
a. 1.2 × 10^56 atoms c. 1.2 × 10^57 atoms b. 3.4 × 10^56 atoms d. 2.4 × 10^57 atoms