Michelle Mcfarland

Numerade Educator
Tutor

Biography

Over 20 years of tutoring experience, with a degree in Biology and Chemistry.

Education

Michelle has not yet added their education credentials.

Educator Statistics

Numerade tutor for 4 years
74 Students Helped

Topics Covered

Unlocking the Power of Thermodynamics: A Comprehensive Guide

Michelle's Textbook Answer Videos

1

Michelle's Quick Ask Videos

05:32
Chemistry 101

During the summer after your first year at Carnegie Mellon, you are lucky enough to get a job making coffee at Starbucks, but you tell your parents and friends that you have secured a lucrative position as a "java engineer." An eccentric chemistry professor (not mentioning any names) stops in every day and orders 250 ml of Sumatran coffee at precisely 75.0°C. You then need to add enough milk at 5.00°C to drop the temperature of the coffee, initially at 85.0°C, to the ordered temperature. Calculate the amount of milk (in ml) you must add to reach this temperature. Show all your work in the provided spaces. In order to simplify the calculations, you will start by assuming that milk and coffee have the specific heat and density as water. In the following parts, you will remove these simplifications. Solve now this problem assuming the density is 1.000 g/ml for milk and coffee and their specific heat capacity is 4.184 J/(g ºC). Hint: the coffee is in an insulated travel mug, so no heat escapes. To insulate a piece of glassware in Virtual Lab, Mac-users should command-click (or open-apple click) on the beaker or flask; Windows users should right-click on the beaker or flask. From the menu that appears, choose “Thermal Properties.” Check the box labeled “insulated from surroundings.” The temperature of the solution in that beaker or flask will remain constant. Use the Virtual Lab to verify your calculations.

Michelle Mcfarland
04:08
Algebra

The City Transit Authority plans to hire 16 new bus
drivers. From a group of 100 qualified applicants, of
whom 55 are men and 45 are
women, 16 names are to be selected by lot. Suppose that
Mary and John Lewis are among the 100 qualified applicants.
(a) What is the probability that Mary's name will be
selected?
What is the probability that both Mary's and John's names will be
selected? (Round your answer to four decimal places.)
(b) If it is stipulated that an equal number of men and women are
to be selected (8 men from the group of 55 men
and 8 women from the group of 45 women), what
is the probability that Mary's name will be selected? (Round your
answer to four decimal places.)
What is the probability that Mary's and John's names will be
selected? (Round your answer to four decimal places.)

Michelle Mcfarland
02:35
Geometry

At 50% and 25% efficiencies two generators would produce 350 MW
of power. At efficiencies of 25% and 75%, they produce 500 MW. At
100% efficiency, what power would each produce?

Michelle Mcfarland
02:53
Geometry

Michelle Mcfarland
04:50
Algebra

Michelle Mcfarland
06:35
Geometry

Michelle Mcfarland
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