Hot air flows through a square 60 cm x 60 cm steel heating duct and the outside surfaces are at 45ºC when the surrounding quiescent air is at 15ºC. Estimate the heat loss from the duct per unit length of the duct.
What will be an ideal response?
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A handle on a cooking pot can be modeled as a rod fin with an adiabatic tip at the farthest section from the attachment points. For the handle shown in the sketch, determine the temperature distribution and the heat transfer through the handle if the pot surface is 190ºF, the surrounding air temperature is 90ºF, and the convective heat transfer coefficient is 160 Btu/hr?ft^2 ?ºF.
What will be an ideal response?
If a satellite's radial velocity is zero at all times, its orbit must be
A) parabolic. B) elliptical. C) circular. D) geosynchronous.
The Earth's rotation axis is tilted from the orbital axis by how much?
What will be an ideal response?
Buoyancy: 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 on it?
A. the aluminum B. the lead C. Both have the same buoyant force. D. It cannot be determined without knowing their volumes.