A man-made satellite of mass 6105 kg is in orbit around the earth, making one revolution in 430 minutes. What is the magnitude of the gravitational force exerted on the satellite by the earth?
(The mass of the earth is 6.0 × 1024 kg and G = 6.67 × 10-11 N ? m2/kg2)
2.5 × 103 N
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A 1-m-square copper plate is placed horizontally on 2-m-high legs. The plate has been coated with a material that provides a solar absorptivity of 0.9 and an infrared emissivity of 0.25. If the air temperature is 30°C, determine the equilibrium temperature on an average clear day in which the solar radiation incident on a horizontal surface is 850 W/m2
GIVEN
• A horizontal copper plate in air
• Plate dimensions (s × s) = 1 m × 1 m
• Solar absorptance (?s) = 0.9
• Infrared emittance (?) = 0.25
• Air temperature (T?) = 30°C = 303 K
• Incident solar radiation (qs/A) = 850 W/m2
FIND
• Equilibrium Temperature (Ts)
ASSUMPTIONS
• The sky behaves as a black body at 0 K
• The effect of the legs is negligible
• Air is quiescent
• Radiative heat transfer from the bottom of the plate is negligible
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 ? 10–8 W/(m2 K4
The Voyager I and II spacecraft visited the jovian planets in the 1980s. When will they reach the distance of the nearest stars?
A) in our lifetime B) in our children's lifetime C) in our grandchildren's lifetime D) about a hundred thousand years from now E) about a million years from now
In the cosmological principle, ________ implies that the direction the observer faces makes no difference on the grandest scale
Fill in the blank(s) with correct word
What is the net force inward acting on a spherical bathysphere of diameter 2.00 m at an ocean depth of 1 000 m? (The pressure inside the bathysphere is, hopefully, 1 ATM.) r(sea water) = 1.02 × 10^3 kg/m3
a. 1.26 × 10^4 N b. 1.26 × 10^6 N c. 1.26 × 10^8 N d. 1.26 × 10^10 N e. 1.26 × 10^2 N