Concrete cubes at 60ºF are heated in a kiln which is at 400ºF and with a convective heat transfer coefficient of 5 Btu/hr?ft2?0F. Using thermal conductivity of 0.79 Btu/hr?ft?ºF, specific heat of 0.21 Btu/lbmºF, and thermal diffusivity of 8.3 x 10^-6 ft^2/s, determine the center temperature and the corner temperatures after 3 hours.
What will be an ideal response?
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How many values of the magnetic quantum number, m?, correspond to a value of 2 for the orbital quantum number, ??
A) 1 B) 2 C) 3 D) 4 E) 5
This graph shows that the orbit of a binary pulsar is decaying just as general relativity predicts it should (notice the agreement between data and theory). What is the significance of this particular result?
A) It supports the prediction that orbiting stars will radiate energy outward in the form of gravitational waves. B) It tells us that time runs slower in this binary system than on Earth. C) It confirms that gravitational lensing can really occur. D) It shows that general relativity can explain all known natural phenomena.
Voids contain about what percentage of the universe's mass?
A) 0 B) 5-10 C) 40-50 D) 100 E) cannot be determined
Buoyancy: If a ship has a mass of 10 million kilograms, what volume of fresh water must it displace in order to float? The density of water is 1000 kg/m3.
A. 1010 m3 B. 1012 m3 C. 104 m3 D. 107 m3 E. 108 m3