A 14-kg block rests on a level frictionless surface and is attached by a light string to a 5.0-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s2, what is the tension in the connecting string?
a. 2.6 N
b. 21 N
c. 49 N
d. 36 N
e. 190 N
d
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The heat transfer coefficient on the inside of a copper tube (1.9-cm-ID and 2.3-cm-OD) is 500 W/(m2 K) and 120 W/(m2 K) on the outside, but a deposit with a fouling factor of 0.009 (m2 K)/W (based on the tube outside diameter) has built up over time. Estimate the percent increase in the overall heat transfer coefficient if the deposit were removed.
GIVEN
• Heat transfer through a copper tube
• Heat transfer coefficients
? Inside h i= 500 W/(m2 K)
? Outside h o= 120 W/(m2 K)
• Tube diameters
? Inside (Di) = 1.9 cm = 0.019 m
? Outside (Do) = 2.3 cm = 0.023 m
• Fouling factor (Rd) = 0.009 (m2 K)/W
FIND
• Per cent increase in the overall heat transfer coefficient if the deposit were removed ASSUMPTIONS
• Constant thermal conductivity properties
• The copper is pure
SKETCH
PROPERTIES AND CONSTANTS
the thermal conductivity of copper (k) = 392 W/(m K) at 127°C
The difference between a meteoroid and an asteroid is the object's:
A) size. B) shape. C) composition. D) orbital period. E) location in the solar system.
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
A. 30 J B. 62 J C. 20 J D. 44 J E. 24 J