Describe the properties of meteoroids
What will be an ideal response?
Objects of rocky material, from microscopic size up to 100 m across, which orbit the Sun. Most originate from collisions between asteroids or are particles released by comets.
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Reactance: What is the reactance of a 1.0-mH inductor at 60 Hz?
A. 0.19 ? B. 0.38 ? C. 2.7 ? D. 5.3 ?
X-ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are:
A) a white dwarf and a neutron star. B) a contact binary system of two red giants. C) a white dwarf and a main sequence star. D) a main sequence or giant star and a neutron star in a mass transfer binary. E) two neutron stars in a mass transfer binary.
Democritus said that, although we imagine many things, "in reality, there are only atoms and the void." This idea could best be classified as
A) witticism. B) stoicism. C) rationalism. D) idealism. E) materialism.
A thin-wall jacketed tank, heated by condensing steam at one atmosphere contains 91 kg of agitated water. The heat transfer area of the jacket is 0.9 m2 and the overall heat transfer coefficient U = 227 W/(m2 K) based on that area. Determine the heating time required for an increase in temperature from 16°C to 60°C.
GIVEN
• A thin wall jacketed tank, heated by condensing steam
• Steam pressure = one atmosphere
• Mass of water in the tank = 91 kg
• The heat transfer area (A) = 0.9 m2
• The overall heat transfer coefficient (U) = 227 W/(m2 K) based on that area
• Temperature increases from 16°C to 60°C
FIND
• Determine the heating time required
ASSUMPTIONS
• Uniform water temperature due to agitation
• Thermal capacitance of the tank wall is negligible
SKETCH
