A 10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. Which one has the greater buoyant force exerted on it by the water?
A) the aluminum
B) the lead
C) The same buoyant force is exerted on both.
D) It cannot be determined without knowing their volumes.
A
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All __________ galaxies are spiral galaxies that have small, luminous nuclei
a. active b. radio c. Seyfert d. double-lobed radio e. blazar
Many specialized applications (ranging from advanced gas-turbine blades to medical devices and implants) require metal components that are coated with protective material layer. In a manufacturing plant for such coatings, infrared lamp is used for curing the coating on metal plates. The lamp provides uniform irradiation of which a flux of 1600 W/m2 is absorbed by the metal plate surface, which has an emissivity of 0.5 for the radiation at the temperature of the coating. Air is used to cool the plate, which is kept in an enclosed environment, and it enters the enclosure at 200C and leaves from the coating process at 300C. (a) If the convective heat transfer coefficient between the coated plate surface and cooling air is 15 W/ (m2 K), estimate the temperature of coating on plate surface.
(b) If the engineer who invented believes that the cure temperature (or surface temperature) of 500C provides a coating with better durability, estimate the infrared lamp irradiation necessary to attain the required average cure temperature for the process.
GIVEN
FIND
- Temperature of coating on plate surface
- Infrared lamp irradiation necessary to attain required cure temperature.
ASSUMPTIONS
- Steady state conditions prevail
- Other heat loss to surrounding is negligible
What is the change in entropy when 1 kg of ice melts at 0°C is (in J/K)? (LF,ice = 333 J/g.)
A. 335. B. 603. C. 1220. D. 1310. E. 2160.
A 50-cm3 block of wood is floating on water, and a 50-cm3 chunk of iron is totally submerged in the water. Which one has the greater buoyant force on it?
A) the wood B) the iron C) Both have the same buoyant force. D) It cannot be determined without knowing their densities.