Energy in Everyday Life (Case Study Sample)

Energy in Everyday Life
Name
Institution
1) How much does it cost (in dollars) to operate one street lamp in Tempe, Arizona for one year?
Hints: Street lamps shine brighter than a household 100 W bulb and are more efficient. Assume a street lamp is on every night; estimate the following values
to answer the question.
In Tempe, Arizona, it costs $23364 to operate a street lamp for one year.2) Estimate the Wattage of a street lamp.
The estimated wattage of a street lamp is 250 watts.3) Estimate the number of hours, a street lamp is on for 1 year.
There are 182.5 nights in a year because the of having equal number of hours per 24 hour day between night and day. Therefore, 182.5 nights have 182/5*12 hours =2190 hours. Thus, a street lamp is on for 2190 hours per year.4)Estimate the cost of electricity (in dollars) per kW-hour in Tempe.
In Tempe, the cost of electricity per Kw-hour is $ 0.115) Estimated cost (in dollars) to operate a street lamp in Tempe for one year
The estimated cost to operate a street lamp is 2190*0.11= $ 240.9
Order of Magnitude - Civilization1) How much energy does civilization consume over the course of a year?Hints: There are ~1 billion homes and industries in the world. Guess that onaverage each house and industry the equivalent of 100 light bulbs. Estimate the following values to answer the question.12000 watts*100 light bulbs*1000000000 users=1 200 000 000 000 000 watts2) Estimate the power of a typical household light bulb (in Watts).In watts, the estimated power of a household light bulb is 40 watts3) Estimate the number of seconds in a year.The estimated number of seconds in a year is 3.15569e7
4) Estimate energy (in joules) that civilization consumes in a year.
1 watt=1000000joule
1 200 000 000 000 000 watts *1000000 = 1.2e+21 joules
Short Answer Questions:
1 Give the physical definition of energy.
Refers to the capacity of any physical system or any physical thing to work.
2 Give 8 examples of different types of energy.
The examples of different types of energy are kinetic energy( moving wind), potential energy (water in a lake), mechanical energy (windmill), electrical energy (electric appliances), heat energy (energy from fire), chemical energy (energy from cooked food), gravitational energy(when an object falls), Electrochemical Energy(light) , Sound Energy (shimmering air)
3 What is a vector? Give some examples.
Refer to quantity having magnitude and direction. Examples are are time, speed , volume, temperature and others.
4 What is a force?
A force is a push or pull upon an object thus changing the object’s state of rest or motion
5 How is work, in the technical sense, defined?
Work refers to the product of force and the distance ove...