When a gas in a container is squeezed to half its volume at constant temperature, its density
A) halves.
B) doubles.
C) quadruples.
D) remains the same.
Answer: B
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A laser beam sends a uniform radiation beam towards the hemispherical opening in a solid housing with dimensions as shown. The surface of the cavity is black and essentially insulated from the surrounding housing material. The hemispherical cavity is a thin-walled metal with a black surface. The temperature of the housing as well as that of the surroundings is 25°C. Determine the radiant flux of the laser beam, G0 [W/m2], if a thermocouple located on the hemispherical surface indicates a temperature of 10°C.
GIVEN
• Laser beam sending uniform radiation beam towards the hemispherical opening.
• Temperature of housing and surrounding (T?)= 250C.
• Temperature difference on thermocouple in hemispherical surface (?Tc) = 100C.
FIND
• Radiant flux of the laser beam.
ASSUMPTIONS
• Cavity surface is black and perfectly insulated from its mounting material.
• Negligible convection heat transfer from cavity surface.
• Surroundings are large, isothermal.
Most of the craters on the Moon are relatively young
a. True b. False Indicate whether the statement is true or false
What is the leading hypothesis for Venus’s lack of water?
A. Venus formed closer to the Sun and accreted very little water. B. Its water is locked away in the crust. C. Its water molecules were broken apart, and hydrogen was lost to space.
Jupiter lies about 5 A.U. from the Sun, so at its distance:
A) the Sun's gravity is just as strong as it is here at Earth. B) the Sun's gravity must be five times stronger to hold massive Jupiter in orbit. C) the Sun's gravity is five times weaker there than at one A.U. distance. D) the Sun's gravity is 25 times weaker than its pull on the Earth. E) the Sun's gravity is so weak that ultimately Jupiter will escape the solar system.