A single-shell-single-tube parallel flow heat exchanger is used to cool oil in a large marine diesel engine. River water at 2 kg/s and 15ºC enters the heat exchanger shell whereas engine oil at 1 kg/s and 140ºC enters the tubes. The engine oil has a specific heat of 2.4 kJ/kg?K. The heat exchanger surface area is 7 m^2 and its overall heat transfer conductance is 400 W/m^2?K when new. Determine (a) outlet oil temperature and (b) outlet oil temperature after some time when the river water has produced a fouling factor of 0.0004 m^2?K/W.
What will be an ideal response?
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The in-plane shear strength of a uniaxial composite material is approximately _________the magnitude of the transverse tensile strength.
Fill in the blank(s) with the appropriate word(s).
Cathode rays are
A. x-rays.
B. 
-rays.
C. electrons.
D. protons.
E. neutrons.
Energy and Momentum: A 1200-kg pick-up truck traveling south at 15 m/s suddenly collides with a 750-kg car that is traveling east. The two vehicles stick together and slide along the road after colliding. A highway patrol officer investigating the accident determines that the final position of the wreckage after the collision is 25 m, at an angle of 50° south of east, from the point of impact. She also determines that the coefficient of kinetic friction between the tires and the road at that location was 0.40. What was the speed of the car just before the collision?
A. 20 m/s B. 4.8 m/s C. 14 m/s D. 23 m/s E. 17 m/s
What is the weak force?
a. Another name for the nuclear force (i.e., the n-n, n-p, p-p) force. b. The gravitational force at the nuclear level. c. A nuclear force much weaker than gravitational forces. d. The force involved in beta decay. e. The force holding electrons to nuclei.