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A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. The ions all have the same charge and are accelerated through the same potential difference before entering the magnetic field. The beryllium and aluminum lines are separated by 1.800 cm on the photographic plate, and the unknown element makes a line between them that is 1.207 cm from the beryllium line.
(a) What is the mass of the unknown element?
(b) Identify the element, using its chemical symbol. (Note that there may be more than one correct answer.)
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The same device can act as both an air conditioner and a heat pump (after all, they do the same thing), what is the coefficient of performance of the device acting as a heat pump
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A 40 percent efficient electric power plant produces 900MW of electric power and discharges waste heat into 30 C ocean water. Suppose the waste heat could be used to heat homes during the winter instead of being discharged into the ocean. A typical A..
How much charge can be placed on a capacitor with air between the plates before it breaks down if the area of each plate is 9.00 cm2
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