Type of sampling
What type of sampling is being employed if the country is divided into economic classes and a sample is chosen from each class to be surveyed?
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Treatment of 1.385 g of an unknown metal M with an excess of aqueous HCl evolved a gas that was found to have a volume of 382.6mL at 20.0 degrees Celsius and 755 mm Hg pressure.
Determine the magnitude of the electric field along the axis of the rod at a point 53.3079cm from the center of the rod. The Coulomb constant is 8.98755*10^9Nm^2/C^2. Answer in units of N/C.
According to the UW Madison 2003-2004 Factbook, 11,488 of the 24,890 students enrolled at UW Madison during that year were from Madison County. This is an example of a _________________ statistic.
A 30.0 W lightbulb is 19.0 percent efficient. This means that 19.0 percent of the electric energy is converted to light energy. (a) How many joules does the lightbulb convert into light each minute it is in operation?
Determine (a) the air exit velocity to produce 5 lbf (b) the volumetric flow rate needed and (c) the minimum mechanical power that must be supplied to the airstream. Take the air density to be .078 lbm/ft^3.
Will the reaction be spontaneous when the partial pressures of 2-propanol, propanone, and hydrogen are all 0.0987 atm.?
Two 1.0 kg masses are 2.0 m apart on a frictionless table. Each has 1.0 uC of charge. 1. What is the magnitude of the electric force on one of the masses?
Use a sketch to show the change that occurs as a sulfur atom becomes a sulfide ion. Describe how the distance from the nucleus to the valence electrons changes as the sulfide ion forms and tell why this change occurs.
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