Satellite Motion: A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has an orbital period of 89 min. The radius of Zeeman-474 is 6.38 × 106 m. What is the mass of this planet? (G = 6.67 × 10-11 N ? m2/kg2)
A. 5.0 × 1024 kg
B. 5.5 × 1024 kg
C. 6.0 × 1024 kg
D. 6.5 × 1024 kg
Answer: C
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Supernovae have little effect on the development of planets such as Earth
a. True b. False Indicate whether the statement is true or false
The walls of a typical industrial furnace used for the heat treating of the metal are usually a composite structure made up of layers of fire brick, high temperature insulation, steel plates, and outer surface cladding. Radiant tubes/beams and/or combustion burners inside the furnace provide the requisite heat. Consider plain surface of such furnace wall where the inner wall surface is heated to 850°C by radiant heating from hot gases at 2000 °C with a heat flux of 45,000W/m2 . The convection heat transfer coefficient of hot gases inside the furnace is estimated to be is 15 W/(m2 K), the thermal conductance per unit area of the composite wall is 250 W/(m2 K), and there is convection at the outer surface of the furnace to the ambient air at T?. Sketch the thermal resistance circuit
for the heat transfer in this system, and calculate the total heat flow per unit area through the composite wall and the exterior wall surface temperature. Also if outside air temperature is T?=30°C, estimate the average convection heat transfer coefficient at the exterior surface.
GIVEN
FIND
(a) Draw the thermal circuit
(b) Rate of heat flow per unit area (q/A)
(c) The exterior surface temperature (Two)
(d) Average convection heat transfer coefficient at exterior surface.
ASSUMPTIONS
- Heat flow through the wall is one dimensional
- Steady state prevails
SKETCH
The International Space Station orbits at an average 360-km altitude so that it is mainly above Earth's
A) atmosphere. B) gravitation. C) both of these D) none of the above
How does degeneracy pressure differ from thermal pressure?
A) Degeneracy pressure continues to be felt even if an object becomes cold, but thermal pressure is drastically reduced as an object gets cold. B) Degeneracy pressure cannot support an object against the crush of gravity, but thermal pressure can. C) Degeneracy pressure can arise in a plasma, but thermal pressure cannot. D) Degeneracy pressure affects stars, but thermal pressure does not.