1. In the book, it was determined that the UK would need 1,200 GWh of electrical storage.
Considering that the average American uses twice as much energy as the average Briton, and
that there are five times as many people living in the United States as th

1. Standby power in the UK accounts for 8% of the total residential electricity demand. If they
eliminate all standby power, what it the maximum percent by which they could reduce their
total electricity demand? (This one is really pretty easy, so Im not

1. In 2009, the proven worldwide reserves of uranium ore totaled 5.404 million metric tons. Also in
2009, the worldwide rate of uranium consumption was 68,000 metric tons per year. Assuming
that this rate remains unchanged and that no further deposits of

1. Consider the following fission reaction:
1
0
n + 239Pu 140Ba + 98Sr + 210n
Given the atomic masses in the table below, how much mass was lost in this process? Note: 1 amu =
1.660541027 kg. Hint: dont convert to kg until after youve found the mass diffe

1.
How many m2 of land area per person do we have in the United States? Youll
need to look up the appropriate data. To keep us all on the same page, use the
official 2010 census population. (Answer: 29,676 m 2/p, your answer may vary a
little depending on

1. According to British Petroleum, the world coal consumption rate in 2009 was 4.68 Gt/yr (data
from http:/www.bp.com.) In that same year, proven worldwide coal reserves stood at 826 Gt.
Assuming that the rate of world coal consumption remains unchanged,

1. Jill loves bottled water. She currently drinks four 500 mL bottles of water every day.
Unfortunately, Jill hasnt been converted to recycling yet, and tosses the empty plastic bottles in
the trash once they are empty. Jill enrolls in FDSCI 200, and beco

1. Calculate the amount of power required to heat a home with a heat-loss coefficient of 6.5
kWh/d/ C using a 95% efficient gas boiler, assuming that the inside-outside temperature
difference is 15.0 C. (Answer: 102.6 kWh/d)
Powerused=15.oCx6.5kWh/d/C/.95

1. Estimate the amount of energy we could save over the course of one year (in kWh) in Rexburg if
every student and employee living within two miles of campus chose to walk or ride a bicycle
each day, using the following assumptions: There are 7,000 stude

1. Supposing that the extractable, sustainable geothermal power density is 20 mW/m2, how much
geothermal power could I pull from a 1/4 acre lot? (Answer: 20.2 Watts, enough to power a
single CFL bulb in my kitchen.)
One quarter of an acre amounts to 1,011

1. It takes a minimum of 3.0238 kWh/d to produce the food for a Vegan consuming 2,600 calories
per day. The average American uses 3,770 calories of food each day (including the food that
spoils in our refrigerators, and that we end up throwing in the tras

1. Stacy came home to her apartment this evening, and discovered that the three light bulbs in her
bedroom light fixture have burnt out. Stacy pays her own electric bill (i.e. utilities are not
included in her rent), and she would like to save money if po

1. The state of Idaho has a mean elevation above sea level of 5,000 feet, and gets on average
approximately 30 inches of rain each year[1]. Determine the total raw hydroelectric power
density for the state of Idaho, in W/m2. (Answer: 0.361 W/m2)
Power per

1. My television consumes energy at a rate of 15 W when it is in standby mode (i.e. turned off)
and 70 W while turned on. On average, my TV is turned off 22 hours each day. Determine how
much energy my TV consumes when it is turned off over the course of

1. Calculate the power density for tidal ranges of 1.05 m, 5.00 m, and 10.0 m. (Answers:
0.25 W/m2; 5.7 W/m2; 23 W/m2.)
Convert the 12 hours into SI units first (43,200 s). The density of water is 1,000 kg/m3,
and the acceleration due to gravity is 9.8 m/

1. William just graduated from BYU-Idaho, landed a nice job, and is getting ready to buy a home for
his family of four. He wisely decides to purchase a newly built home, since newer homes are
more energy efficient. There are two homes that fit his criteri

1. How much power per unit length of coastline do you have if waves are typically 0.5 meters high
with a speed of 8.0 m/s? (Answer: 4.9 kW/m)
P/L=1/4x(1000kg/m^3)x(9.8m/s^2)x(0.5m)^2x(8.0m/s)=4,900 W/m or 4.9 kW/m
2. The country of Portugal, which borders

1. Masie, who lives in Salt Lake City, loves to travel. She especially likes to travel to Rome
(9,300 km away), and does so once every two years. She always flies non-stop on a
Boeing 747, and there are usually 300 passengers on the plane. How large is Ma

1. The average solar power per unit area across the entire United States is in the ballpark of 200
W/m2. Assuming there are 309 million people in the United States, calculate the total available
solar power per person, in kWh/d/p. Note: youll have to look

1. An adult male African elephant typically weighs somewhere in the neighborhood of 11,000 lbs,
and each of their feet has an area of around 0.166 m2. Calculate the pressure on the bottom of
an adult elephants foot when it is standing on one leg. (Circus,

1. You have just moved into a new home located five miles from your place of work, meaning that
you will need to travel on average about 10 miles per day. You have three options for your mode
of transportation, addressed by this question and the two that

1. In the diagram below, determine whether each of the processes shown are isothermal, isobaric,
isochoric, (possibly) adiabatic, or none of the above. Justify your answers. Note that the dotted
curved lines represent isotherms.
(a) Isochoric. The volume

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Identify whether each of the following assertions is factual or ethical: Factual
It costs less to drive a Toyota Prius than it does to drive a Dodge Ram:ethical
A person cannot drive a Hummer if they really care about the en

1. The average annual wind speed in Tulsa, OK is 11.06 mph. Assuming a wind turbine efficiency of
50%, calculate the power per unit area for a wind farm in Tulsa[1]. (Answer: 1.23 W/m2)
I simply need to plug in all of the variables, in SI units. The densi

1.Look at the table in the reading once again. The way you get the number of microstates corresponding
to a given number of heads is with the so-called binomial coefficients C(N,k) where N is the number of
items in your set, and k is the number you would

1. Consider a car driving down the highway at a constant speed. Identify all of the ways in which
the energy of the car is being lost (i.e. transformed into a form other than the desired kinetic
energy). (Answer: you should be able to identify at least th

1. How much energy is consumed by a 60 W light bulb that is left on for 30 days? Express your
answer both in Joules and in kWh. (Answer: 155,520,000 J, or 43.2 kWh)
P=E/t for energy, we get E=Pt
Convert all numbers into SI units. The power, 60 W, is alrea

1. A 100 gram stone is fired straight into the air from the ground, with an initial speed of 30 m/s.
Neglecting the effects of air resistance, how high will the stone travel above the ground before
falling back down? (Answer: 45.9 meters)
K=1/2mv^2=1/2(0.

Calculate the kinetic energy of a 2,000 lb car traveling at 65 mph. Note: make sure you do the
appropriate unit conversions! (Answer: 383,000 J. Depending on where you obtained your unit
conversion factors, your answer may vary slightly from this one.)
Fi

1. Calculate the thermal energy of one cup (0.237 kg) of water at 100C and a bathtub full of water
(708 kg) at 0C. (Answers: 370 kJ, 809 MJ.)
For both of these, we use the equation
Eth=mcT
making sure the temperature is in the right units (Kelvin). Note t