Question
In: Physics
You place your lunch leftovers in the refrigerator. Suppose the refrigerator needs to remove 2.0090E+4 J...
You place your lunch leftovers in the refrigerator. Suppose the refrigerator needs to remove 2.0090E+4 J of thermal energy from your lunch to cool it to the temperature of the inside of the refrigerator. In the meantime, this means the refrigerator produces 2.7959E+4 J of thermal energy that it expels into the kitchen as a result. What is the total work done by the compressor motor in the refrigerator? (Ignore any thermal loses due to friction in the motor.)
What is the Coefficient of Performance for the refrigerator?
Your refrigerator actually acts like a heater in your kitchen. Suppose you have a small electric space heater that has a power output of 1.2kW. How long would this heater have to run to produce the same amount of heat as the refrigerator produced while cooling your leftovers?
It takes electricity to run the motor on the refrigerator. If your cost of electricity is 13 cents per kilowatt*hour, how much does it cost (in cents - do not enter units) to cool your lunch down?
Solutions
genius_generous answered 1 hour agoRelated Solutions
You place your lunch leftovers in the refrigerator. Suppose the refrigerator needs to remove 1.5990E+4 J...
You place your lunch leftovers in the refrigerator. Suppose the
refrigerator needs to remove 1.5990E+4 J of thermal energy from
your lunch to cool it to the temperature of the inside of the
refrigerator. In the meantime, this means the refrigerator produces
2.1449E+4 J of thermal energy that it expels into the kitchen as a
result. What is the total work done by the compressor motor in the
refrigerator? (Ignore any thermal loses due to friction in the
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Suppose a market place for candy has emerged in the school lunch room. The price of...
Suppose a market place for candy has emerged in the school lunch
room. The price of a Starburst is 16 cents, p1 = 16, and the price
of an M&M is 4 cent, p2 = 4. Antonio has 12 Starbursts and zero
M&M’s. Kate has zero Starbursts and 200 M&Ms. Suppose
Antonio’s and Kate’s preferences are characterized by marginal rate
of substitution functions, MRSAntonio(x1,x2) = (12)/(√(3(x1))
MRSKate (x1,x2)= (2√(2(x2))/(5)
1. Verify that MRS representation of preferences for Antonio and
Kate...
You eat at your office cafeteria every day during lunch time. However, you think it needs...
You eat at your office cafeteria every day during lunch time.
However, you think it needs some improvements. Write a letter to
the manager of the cafeteria. In your letter,
• explain what you like about the cafeteria
• describe the two (2) problems you experienced at the
cafeteria;
• suggest two (2) ways how the problems can be resolved.
You eat at your office cafeteria every day during lunch time. However, you think it needs...
You eat at your office cafeteria every day during lunch time.
However, you think it needs some improvements.
Write a letter to the manager of the cafeteria.
In your letter about 350 words,
explain what you like about the cafeteria
describe the two (2) problems you experienced
at the cafeteria and explain and example;
suggest two (2) ways how the problems can be
resolved and explain an example.
\
Suppose there are two ways to reduce water pollution in a river. Society needs to remove...
Suppose there are two ways to reduce water pollution in a river.
Society needs to remove 150 units of pollution (q). The marginal
cost of the first method is 2q1. The marginal cost of the second
method is 3q2. Society wants to use the most cost-effective way to
reduce water pollution. How many units of pollution should be
removed using the second method? (Round your answer to two decimal
places.
Weighing Lunch For lunch you and your friends decide to stop at the nearest deli and...
Weighing Lunch
For lunch you and your friends decide to stop at the nearest
deli and have a sandwich made fresh for you with 0.100 kg of
turkey. The slices of turkey are weighed on a plate of mass 0.400
kgplaced atop a vertical spring of negligible mass and force
constant of 200 N/m . The slices of turkey are dropped on the plate
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a. You are in the market for a new refrigerator for your company’s lounge, and you...
a. You are in the market for a new refrigerator for your
company’s lounge, and you have narrowed the search down to two
models. The energy-efficient model sells for ¢1,700 and will save
you ¢45 in electricity costs at the end of each of the next five
years. The standard model has features similar to the
energy-efficient model but provides no future saving in electricity
costs. It is priced at only ¢1,500. Assuming your opportunity cost
of funds is 6...
You are in the market for a new refrigerator for your company’s lounge, and you have...
You are in the market for a new refrigerator for your company’s
lounge, and you have narrowed the search down to two models. The
energy-efficient model sells for $6,000 and will save you $200 at
the end of each of the next five years in electricity costs. The
standard model has features similar to the energy-efficient model
but provides no future saving in electricity costs. It is prices at
$5,000. Assuming your opportunity cost of funds, i..e. the interest
rate,...
: : You and your family at organising Christmas lunch at your house this year. You...
:
: You and your family at organising Christmas lunch at
your house this year. You have a large family and expect 20 people
to attend. Four people who will attend have dietary requirements,
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(1) Imagine that this is a...
For the next 4 questions suppose the following holds: Suppose the security I and security J...
For the next 4 questions suppose the following
holds:
Suppose the security I and security J have the following
historical returns:
Year
rI
rJ
2015
20%
40%
2016
29%
36%
2017
-12%
-25%
What is the (arithmetic) average return on security I?
9.17%
12.33%
13.00%
14.18%
15.52%
What is the standard deviation of the return on security I?
(Use n-1 for the denominator.)
9.09%
17.39%
20.82%
21.55%
25.18%
Suppose you invest 50% of your money in I and the rest...
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