In the presidential election of 1868, Ulysses S. Grant
A. transformed his personal popularity into a large majority in the popular vote.
B. owed his victory to the votes of former slaves.
C. gained his victory by winning the votes of the majority of whites.
D. won a clear majority of electoral votes in the Electoral College, but narrowly lost the popular vote in the country.
E. All of these choices are correct.
Answer: B
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Stall barns require less labor to fasten and release cows than other types of barns
Indicate whether the statement is true or false.
A fracture in the weld metal running across the weld is known as a _____
A) transverse crack B) longitudinal root crack C) wagon track D) longitudinal crack
The conversion of cyclobutane 
to ethylene 
is a first-order reaction. This means that the concentration of cyclobutane at time t is given by lnC=ln
?kt, where C is the concentration at time t, is the initial concentration, t is the time since the reaction started, and k is the rate constant. Assume that =0.2 mol/L with negligible uncertainty. After 300 seconds at a constant temperature, the
concentration is measured to be C=0.174 ± 0.005 mol/L. Assume that time can be measured with negligible uncertainty.
a. Estimate the rate constant k, and find the uncertainty in the estimate. The units of k will be 
.
b. Find the relative uncertainty in k.
c. The half-life 
of the reaction is the time it takes for the concentration to be reduced to one-half its initial value. The half-life is related to the rate constant by =(ln 2)/k. Using the result found in part (a), find the uncertainty in the half-life.
d. Find the relative uncertainty in the half-life.
After making a belt or pulley adjustment to a belt drive fan, it is crucial to check
A) the resistance of the motor windings B) the fan motor operating current reading C) the level of the blower housing D) the resistance of the motor winding insulation with a megohm meter