A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?
A) sphere
B) pipe
C) cylinder
D) The pipe and cylinder arrive together before the sphere.
E) They all reach the bottom at the same time.
A
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A large spherical tank is filled with liquid nitrogen at -200ºC. Using an approximation that the elements of the sphere are infinite walls with initial temperature of 10ºC, when the surroundings are at 10ºC as shown, predict the temperature through the wall after 5 minutes using graphical techniques. The tank is 1% carbon steel, 2 cm thick, and the convective heat transfer coefficients are 40 W/m^2 K for air and 60 W/m^2 K for the nitrogen. Also determine the time before the outside wall reaches 5ºC.
At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately
A) 40 m/s. B) 50 m/s. C) 55 m/s. D) 60 m/s.
When taking a photo of a nearby flower, your camera lens should be set
A) closer than one focal length from the photosensitive surface. B) farther than one focal length from the photosensitive surface. C) to one focal length from the photosensitive surface.
The process of leveling of the Earth by the wearing away of high places and the transportation of sediment to lower places is known as
a. mass wasting. b. the hydrologic cycle. c. degradation. d. gradation.