Average temperature coefficient of resistivity
A 104 W lightbulb has a resistance of about 12 when cold (20°C) and 137 when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity a = 0.0060 (C°)-1.
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If, instead, the gold is drawn out into a cylindrical fiber of radius 2.700 µm, what is the length (in m) of the fiber?
A specific brand of gourmet chocolate candy contains 7.00g of dietary fat in each 22.7-g piece. How many kilograms of dietary fat are in a box containing 2.00lb of candy?
Why should samples be tightly packed in capillary tubes ( to find melting points ) and what are 2 problems with performing MP with wet product?
Suppose a box contains 4 balls labeled 1,2,3,4. Three balls are randomly selected from the box with replacement. Let X= the smallest of the 3 numbers on the balls chosen. Find the probablity mass function (pmf) for X.
At ordinary body temperature (37 degrees Celsius) the solubility of N2 in water in contact with air at ordinary atmospheric pressure (1.0 atm) is 0.015 g/L. Air is approximately 78 mol % N2.
A vessel contains 0.90 g liq H2O in equilibrium with water vapor at 30C. At this temperature, the vapor pressure of H2O is 31.82 torr. What volume increase is necessary for all the water to evaporate?
Two masses m1 and m2 are connected via a massless, unstrecthable string over a massless pulley. Mass m2=72N rests on the surface of an incline making θ=34 degrees. What must be the mininmum value of m1 that will make m2 begin to move? Assume
Arrivals during the evening at a hospital emergency room are assumed to follow a Poisson distribution. The rate on Saturday evening is 2.5 per hour and on Sunday evening is 0.5 per hour.
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Question: Identify a true statement about validity as applied to a test. Multiple choice question
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