Module 5 Assignment: Part 1: SES 141: Energy in Everyday Life latest update
Estimate the cost of electricity (in dollars per kilowatt-hour).
0.12
Estimate the volume of a typical pea (in cm3).
0.267
Estimate the diameter of a typical pea (in cm).
0.8
One human heartbeat uses about how much energy?
1 joule
A 17 kilogram eagle is flying at 14 meters/sec. What is the kinetic energy (in joule) of the eagle? Use exact numbers; do not estimate.
1,666
Estimate the average time spent eating (in minutes per day).
120
Estimate the number of peas that fit inside a 1 gallon jar.
14,176
Estimate the volume of a 1 gallon container (in cm3).
3,785
Estimate the power used by a typical household refrigerator (in watt).
350
The fraction of people doing any activity is equal to the fraction of time it takes to do that activity. In symbols, N/Ntotal = T/Ttotal. Estimate the number of people currently eating right now.
350,354,167
Estimate the cost of operating a refrigerator for a year (in dollars) .
627.6
A 117 Watt light bulb is turned on for 1 minute. How much energy, in Joule, is used? Use exact numbers; do not estimate.
7,020
Estimate the number of people in the world.
7,800,000,000
Estimate the number of hours in a year that a refrigerator runs.
8,760
A force is in the
Direction of the change in motion.
What is energy?
Energy is the capacity to do work.
What are our 8 guidelines for making an order of magnitude estimate?
Guess, Talk to your gut, Divide and conquer, Lie skillfully, Punt, Use guerrilla warfare, Lower your standards, Cross-check.
Work, in the technical sense of the word, has units of
Joules
Select items that are forms of energy
Kinetic, Potential, Gravitational.
A vector has these properties:
Magnitude, Direction.
Work is
a force times a distance, and the transfer of energy.
A force is
is responsible for a change in motion, and is a mass times an acceleration.