Filament in an incandescent light bulb
The filament in an incandescent light bulb is made from tungsten. The light bulb is plugged into a 240 V outlet and draws a current of 1.04 A. If the radius of the tungsten wire is 0.003 mm, how long must the wire be?
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Which of the following investments would have the highest future value at the end of 10 years? Assume that the effective annual rate for all investments is the same and is greater than zero. Pick the correct answer. Investment A pays $250 at the b
The earth's magnetic field, with a magnetic dipole moment of 8.5×1022 A*m^2, is generated by currents within the molten iron of the earth's outer core. (The inner core is solid iron.)
The rate constant ,k, for a given reaction was determined at a number of temperatures. a graph of log k versus the reciprocal of the kelvin temperature yielded a straight line with a slope of -250k.
You plan to invest some money in a bank account. Which of the following banks provides you with the highest effective rate of interest? Pick the correct answer.
Suppose the U.S. Treasury offers to sell you a bond for $747.25. No payments will be made until the bond matures 5 years from now, at which time it will be redeemed for $1,000. What interest rate would you earn if you bought this bond at the offer
Determine the ratio of the mass flow rates of the hot to cold water. Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a pressure of 20 psia.
Consider a container of volume 5.0dm3 that is divided into two compartments of equal size. In the left compartment there is nitrogen at 1.0 atm and 25oC; in the right compartment there is hydrogen at the same temperature and pressure.
A light bulb is wired in series with a 139 resistor, and they are connected across a 120 V source. The power delivered to the light bulb is 23.7 W. What are the two possible resistances of the light bulb?
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