An ice cube that contains small pieces of iron floats on water. When the ice melts, the water level
A) rises.
B) falls.
C) remains unchanged.
Answer: B
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A two-shell-eight-pass heat exchanger is used to recoup heat from coolant water in a manufacturing plant. The heat exchanger has a rated area of 15 m^2 with an overall heat transfer coefficient of 900 W/m^2?K. The device has been used and has a fouling factor of 0.0001 m2?K/W. The coolant water enters at 85ºC and leaves at 55ºC whereas the cooling water enters at 15ºC and leaves at 45ºC. Determine (a) the mass flow of the coolant water and (b) the heat exchanger effectiveness.
What will be an ideal response?
Where did comets that are now in the Kuiper belt originally form?
A) in the asteroid belt B) inside Jupiter's orbit C) between the orbits of Jupiter and Neptune D) near the radius at which they orbit today E) in the Oort cloud
The focal length of a converging lens is 10 cm. What is the magnification of this lens if the image is viewed by a relaxed eye with a near point of 25 cm?
A) 0.5 B) 1.5 C) 2.5 D) 3.5 E) 4.5
Euler’s equation integrated along a streamline results in Bernoulli’s equation provided the flow is:
(A) Incompressible, inviscid, steady, in an inertial reference frame (B) Constant density, steady, along a streamline, in an inertial reference frame (C) Incompressible, steady, along a streamline, in an inertial reference frame (D) Constant density, steady, along a streamline, inviscid, in an inertial reference frame