Evaluate the surface charge density on the drum
The electric field just above the surface of the charged drum of a photocopying machine has a magnitude E of 3.1 x 105 N/C. What is the surface charge density on the drum, assuming that the drum is a conductor?
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Suppose 3% of cotton fabric rolls and 3% of nylon rolls contain flaws. Of the rolls used by a manufacturer, 70% are cotton and 30% are nylon. What is the probability that a randomly selected roll used by the manufacturer contains flaws? Round your
The concentration of Mg2+ in seawater is 0.052 M. What hydroxide concentration is needed to remove 90% of the Mg2+ by precipitation?
Assume all temperatures to be exact, and neglect significant figures for small changes in dimension. An ideal gas in a cylinder is at 12 degrees C and 2.0atm .
A bat emits a sound whose frequency is 82.2 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 37.3 oC, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength of
Oxygen tanks are filled by compressing the oxygen gas as shown. An initially evacuated 1 m3 tank is to be filled to 13,000 kPa. Determine the total work required by the compressor.
A stream of toluene is mixed with a recycle stream and enters a reactor along with a stream of pure hydrogen. The reaction products at 510°C enter a condenser where they are cooled to 44.0°C.
Consider a population that consists of 600 lives aged 50 and 520 lives aged 60. Probability: one aged 50 lives to 80 p=0.43732 probability: one aged 60 lives to 80 p=0.47806 and all lives have independent future lifetime random variables. Calculat
The principal plane stresses and associated strains in a plane at a point are s1 = 36 ksi, s2 = 16 ksi, e1 = 1.02(10^-3), and e2 = 0.180(10^-3).
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