Secondary seismic waves travel ______________ primary waves in solids
a. in the direction opposite to the movement of
b. slower than
c. faster than
d. at right angles to
b
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A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object?
A. 15 B. 25 C. 50 D. 100 E. ?15
An attractive method of energy conservation in industrial settings is to utilize waste heat from largescale power generating equipment. In one such scheme, the exhaust gases from the diesel engine of an industrial power generator are channeled through a cross- flow, compact, waste-heat recovery boiler to produce process steam. In one such heat exchanger, a finned tube bundle is configured with tubes of 2.5 cm outer diameter that are arranged in a staggered equilateral- triangular array with tube center-to-center pitch of 7.5 cm. Engine exhaust gas (thermal properties of which are taken to be the same as those for air) at 400°C is in cross-flow over the tube bank with a free stream velocity of 2.0 m/s. In order to enhance the gas-side convective heat transfer, the tubes have thin circular
fins on their outer surface and the finned surface extension ratio ?=1.15. Due to the steam generation process inside the tubes, their outer surface temperature is 175°C. If there are 10 rows of tubes in the flow direction (NL = 10), calculate the average heat transfer coefficient and pressure drop for the gas flow stream.
GIVEN
FIND
The average heat transfer coefficient (c h) and pressure drop in gas flow stream.
ASSUMPTIONS
Steady state
Tube wall temperature is uniform and constant
SKETCH
PROPERTIES AND CONSTANTS
The materials that compose most of Titan are completely different than those that compose Earth. Therefore, what were scientist surprised to see from space-probe images in a 2005 landing?
A) some indications that an ancient civilization may have inhabited Titan approximately 500,000 years ago B) a landscape similar to Earth's C) an utterly alien landscape, unlike anything seen on Earth D) the image of a man's face on an equatorial mountain range
Most of the moons of Saturn have rocky, cratered surfaces, like Deimos and Phobos
Indicate whether the statement is true or false