A 100 gram meter stick has a wad of clay on one end of it. The stick is supported from a fulcrum point 33 1/3 cm from the clay. What is the clay's mass?
1.25 grams
2.50 grams
3.100 grams
4.200 grams
2
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The Alaska Pipeline carries 2 million barrels of crude oil per day from Prudhoe Bay to Valdez covering a distance of 800 miles. The pipe diameter is 48 in. and it is insulated with 4 in. of fiberglass covered with steel sheeting. Approximately half of the pipeline length is above ground, running nominally in the north-south direction. The insulation maintains the outer surface of the steel sheeting at approximately 10°C. If the ambient temperature averages 0°C and prevailing winds are 2 m/s from the northeast, estimate the total rate of heat loss from the above-ground portion of the pipeline.
GIVEN
• Fiberglass insulated pipe with air flow at 45° to its axis
• Insulation is covered with sheet steel
• Length of pipe above ground (L) = (800 miles)/2 = 400 miles
• Pipe diameter (Dp) = 48 in.
• Insulation thickness (t) = 4 in.
• Sheet steel temperature (Ts) = 10°C
• Average ambient air temperature (T?) = 0°C
• Average air velocity (U?) = 2 m/s
FIND
• The total rate of heat loss from the above ground portion of the pipe (q)
ASSUMPTIONS
• Thermal resistance of the sheet steel as well as contact resistance can be neglected
SKETCH
A battery acquires and stores
A) potential. B) charge. C) energy. D) energy, charge, & potential. E) charge & potential but not energy.
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V
The color of a star is a measure of its
A) surface temperature B) chemical composition C) mass D) size