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.