Question

caps environmental science unit 1: ecological footprint end - of - cycle exam
course introduction: the mystery of easter island: in this task, you explored the collapse of the easter island civilization through videos, reading, and discussions. use your knowledge from this task to help you answer the following multiple - choice and short answer questions.

1. which action best illustrates the concept of the tragedy of the commons?

a. destroying the landscape by mining on private land
b. harvesting only mature trees in a national forest
c. setting limits on ocean fishing to avoid depleting fish stocks
d. depleting an aquifer through irrigation by regional farmers
e. developing a new landfill for municipal solid waste

1. what might have contributed to the native population from easter island decline?

electricity audit lab: in this task, you conducted an electricity audit to measure your family’s electricity use. you analyzed that data with calculations, which you interpreted by using support from discussions and textbook readings. use your knowledge from this task to help you answer these multiple - choice and free - response questions. where calculations are required, clearly show all your work and how you arrived at the answer as partial points can be given. when not doing calculations, write in clear and complete sentences.

1. a home uses ten 100 - watt light bulbs for five hours per day. approximately how many kilowatt hours of electrical energy are consumed in one year by using the light bulbs?

a. 365
b. 1,825
c. 5,000
d. 182,500
e. 365,000

1. a christmas tree has a 250 - watt string of lights which is on for fourteen hours per day. approximately how many kilowatt hours of electrical energy are consumed in one month by using the string of lights?

a. 3.5
b. 105
c. 1,027
d. 1,277.50
e. 3,500

Explanation:

Step1: Convert watt to kilowatt

The formula to convert watt to kilowatt is \(1\space kW = 1000\space W\).
For question 3: Each bulb is \(100\space W\), so \(10\) bulbs have a total power of \(P = 10\times100=1000\space W = 1\space kW\).
They are used for \(t = 5\space h\) per day.
In one year (\(n = 365\) days), the total energy consumption \(E=P\times t\times n\).
Substitute the values: \(E = 1\times5\times365=1825\space kWh\).

For question 4: The string of lights has a power of \(P = 250\space W=0.25\space kW\).
It is used for \(t = 14\space h\) per day.
Assume a month has \(n = 30\) days.
The total energy consumption \(E=P\times t\times n\).
Substitute the values: \(E=0.25\times14\times30 = 105\space kWh\).

Answer:

1. B. \(1,825\)
2. B. \(105\)