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Introductory Chemistry 5
Describe Rutherfords gold foil experiment and the results of that experiment. How did these results refute the plum pudding model of the atom?

Introductory Chemistry 5
For each compound, list the correct formula and calculate the formula mass. (a) tin(IV) sulfate (b) nitrous acid (c) sodium bicarbonate (d) phosphorus pentafluoride

College Physics 7
A ball of mass 0.150 kg is dropped from rest from a height of 1.25 m. It rebounds from the oor to reach a height of 0.960 m. What impulse was given to the ball by the oor?

Physical Chemistry 8
Use symmetry properties to determine whether or not the integral pxzpzd is necessarily zero in a molecule with symmetry C4v.

Principles of Economics 6
Suppose the federal government requires beer drinkers to pay a $2 tax on each case of beer purchased. (In fact, both the federal and state governments impose beer taxes of some sort.) a. Draw a supply-and-demand diagram of the market for beer without the tax. Show the price paid by consumers, the pri

Brief Applied Calculus
First make a substitution and then use integration by parts to evaluate the integral. \(\int t^{3} e^{-t^{2}} d t\)

Principles of Economics 9
Which of the following is an example of a public good? a. residential housing b. national defense c. restaurant meals d. fish in the ocean

Principles of Economics 9
Many transportation systems, such as the Washington, D.C., Metro (subway), charge higher fares during rush hours than during the rest of the day. Why might they do this?