The lack of large impact craters on the surface of Europa is consistent with
A) active volcanism that is constantly resurfacing the crust
B) the surface being covered with an ocean of liquid water
C) the crust being so thick and hard that impacts leave no marks on the surface
D) a subsurface ocean of water because large impacts will break the thin crust causing water and slushy ice below to flood out and resurface the crust
D
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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?
There are no known exceptions to
A) the law of conservation of energy. B) Newton's law of motion. C) Both of the above. D) Nonsense--all physical principles have known exceptions.
Light that has all the electrical fields vibrating in the same plane is said to be ________
Fill in the blank(s) with correct word
At a certain instant the current flowing through a 5.0-H inductor is 3.0 A. If the energy in the inductor at this instant is increasing at a rate of 3.0 J/s, how fast is the current changing?
A) 0.20 A/s B) 0.10 A/s C) 0.80 A/s D) 0.40 A/s