A velocity vector has components 36 m/s westward and 22 m/s northward. What are the magnitude and direction of this vector?
What will be an ideal response?
42 m/s at 31° north of west
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Heat is transferred at a rate of 0.1 kW through glass wool insulation (density = 100 kg/m3 ) with a 5 cm thickness and 2 m2 area. If the hot surface is at 70°C, determine the temperature of the cooler surface.
GIVEN
• Glass wool insulation with a density (?) = 100 kg/m3
• Thickness (L) = 5 cm = 0.05 m
• Area (A) = 2 m2
• Temperature of the hot surface (Th) = 70°C
• Rate of heat transfer (qk) = 0.1 kW = 100 W
FIND
• The temperature of the cooler surface (Tc)
ASSUMPTIONS
• One dimensional, steady state conduction
• Constant thermal conductivity
SKETCH
PROPERTIES AND CONSTANTS
The thermal conductivity of glass wool at 20°C (k) = 0.036 W/(m K)
A solenoid carrying an electric current, if free to rotate when placed in a magnetic field, will tend to orient its axis ________ (parallel, perpendicular, anti-parallel) to the magnetic field.
Fill in the blank(s) with the appropriate word(s).
A weather balloon contains 12.0 m3 of hydrogen gas when it is released from a location at which the temperature is 22°C and the pressure is 101 kPa
It rises to a location where the temperature is -30°C and the pressure is 20 kPa. If the balloon is free to expand so that the pressure of the gas inside is equal to the ambient pressure, what is the new volume of the balloon? A) 14.0 m3 B) 2.38 m3 C) 49.9 m3 D) 82.6 m3 E) 4.16 m3
The Mississippi River delta has widely spaced distributary channels extending long distances into the Gulf of Mexico. This is an example of a(n) ________ delta.
a. estuarine b. bird's-foot c. alluvial d. fluvial e. arcuate