What is the resistance of a wire of same material and length
A wire of cross-sectional area 5.00*10^-6 m^2 has a resistance of 1.75 Ohms. What is the resistance of a wire of the same material and length as the first wire, but with cross-sectional area of 8.75*10^-6 m^2?
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Heat must be transferred from the cold space at a rate of 2 kW to maintain its temperature at -30ºC. What is the theoretically smallest (power) motor required to operate this freezer?
When a suspected drunk driver blows 188 mL of his breath through the fuel-cell breathalyzer, the breathalyzer produces an average of 324 mA of current for 10s.
A touches B, then the two spheres are separated. B touches C, then those spheres are separated. Finally, C touches A and those two spheres are separated. How much charge is on each sphere?
Suppose that 1 kg of saturated water vapor at 100ºC is condensed to a saturated liquid at 100ºC in a constant-pressure process by heat transfer to the surrounding air, which is at 25ºC.
A solution is made to be 3.8 * 10-2 M in Al3+ and .29 M in NaF. If the Kf for AlF63+ is 7 * 1019, how much aluminum ion remains at equilibrium?
The cold space that absorbs the energy could be a bath of liquid water and ice. Calculate the change of entropy of the cooling medium.
Calculate the pH of a solution prepared by mixing 15.0mL of 10M NaOH and 30.0mL of 10.0M benzoic acid solution.(Benzoic acid is monoprotic; its dissociation constant is 6.5*10^-5)
What was the cumulative incidence rate of hearing loss in workers who did not wear earplugs? What was the relative risk of hearing loss in workers who did not wear earplugs, compared with those who did? What was the risk of hearing loss attributable
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