What is the film temperature?
What will be an ideal response?
The Prandtl number is an index of the ratio of the momentum or viscous
transfer in a fluid to the thermal energy or heat transfer. A high Prandtl number
indicates a high momentum or viscous energy transfer as compared to the
thermal energy transfer.
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Which of these is true about the seasons of Uranus?
A) With a tilt of 29 degrees, they are not that different from our solstices and equinoxes. B) Its strange tilt produces extreme seasonal variations, especially at the poles. C) At the Uranian equator, the Sun would pass overhead every sixteen hours. D) At the Uranian pole the Sun sets every 16 hours during the summer and winter. E) There are no seasons at the poles.
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 1000-m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
A. 0.25 B. 0.50 C. 1.00 D. 2.00 E. 4.00
After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations:
Electrons moving upward feel a magnetic force in the northwest direction. Electrons moving horizontally toward the north are pushed downward. Electrons moving horizontally toward the southeast are pushed upward. Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction? A) toward the west B) toward the southwest C) toward the east D) toward the northeast E) toward the southeast
50 cm3 of wood is floating on water, and 50 cm3 of iron is totally submerged. Which has the greater buoyant force on it?
A) the wood B) the iron C) Both have the same buoyant force. D) cannot be determined without knowing their densities