While often called twins, Uranus and Neptune still have significant differences. Discuss some of them
What will be an ideal response?
In mass, Neptune is slightly heavier, even though Uranus is slightly larger in size. Both rotate faster than Earth but slower than Jupiter and Saturn. Uranus has a flopped over axial tilt of 98 degrees, capable of pointing its poles directly at the Sun, while Neptune has a more normal 29 degree tilt. The atmosphere of Neptune is bluer in color and more active, surprising since Uranus gets more solar heat; Neptune generates its heat internally, something that Uranus, alone among the jovians, does not do to any degree. Both have odd magnetic fields, with Uranus even more tilted than Neptune, and neither field passes through the core.
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If an object is in equilibrium, the net torque about any arbitrary axis must be zero
Indicate whether the statement is true or false
Dr. X claims that the Hubble constant is 20 km/s/million light-years while Dr. Y claims it is 24 km/s/million light-years. Which statement below automatically follows?
A) Dr. X concludes that the universe is expanding, but Dr. Y does not. B) Dr. X will conclude that the Andromeda Galaxy (a member of our Local Group) is moving away from us at a slower speed than will Dr. Y. C) Dr. X will conclude that the universe is older than will Dr. Y. D) Dr. X believes that the universe will someday stop expanding, while Dr. Y believes it will expand forever. E) Dr. X will conclude that the universe contains more mass than will Dr. Y.
Part of a wreck from a ship weighs 500 N. It displaces 100 N of fluid. The buoyant force acting on it is
1) 100 N. 2) 250 N. 3) 500 N. From this we can see that the buoyant force is equal to the 4) weight of the submerged object. 5) volume of fluid displaced. 6) difference between the weight of the object and the weight of fluid. 7) weight of fluid displaced.
Calculate the heat loss through a 1-m *3-m glass window 7-mm-thick if the inner surface temperature is 20°C and the outer surface temperature is 17°C. Comment on the possible effect of radiation on your answer.
IVEN
• Window: 1 m by 3 m
• Thickness (L) = 7 mm = 0.007 m
• Surface temperature
? Inner (Ti) = 20°C
? outer (To) = 17°C
FIND
• The rate of heat loss through the window (q) ASSUMPTIONS
• One dimensional, steady state conduction through the glass
• Constant thermal conductivity
SKETCH
PROPERTIES AND CONSTANTS
Thermal conductivity of glass (k) = 0.81 W/(m K)