Which of the following is part of the Sun's structure?
a. Globular cluster
b. Accretion disk
c. Singularity
d. Corona
d
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A ceramic mixture
We now know of many Jupiter-size planets around other stars. Suppose that future observations show that one of these planets has two orbiting moons. What additional information, if any, would we need to decide whether these moons experience tidal heating?
a. We need to know their orbital periods. b. We need to know whether either moon is volcanically active. c. We need to know whether the planet also has a third moon. d. No other information is needed: With two moons, there is sure to be tidal heating. e. No other information is needed: With two moons, there is no chance of any tidal heating.
A thin-walled cylindrical tank with a diameter of 200 mm has an internal pressure of 11 MPa. The yield stress in tension is 250 MPa, the yield stress in shear is 140 MPa, and the factor of safety is 2.5. The mini-mum permissible thickness of the tank is approximately:
(A) 8.2 mm (B) 9.1 mm (C) 9.8 mm (D) 11.0 mm
The reverse of the respiration reaction is the reaction known as
A) combustion. B) oxidation. C) photo-synthesis. D) inhaling. E) exhaling.