those are mutiple choice

Question 11pts

Sulfur dioxide is an atmospheric pollutant which is a major component of smog.L. Barrie and R. Hoff studied sulfur dioxide pollution in the atmosphere of the Alaskan Arctic.They determined that the residence time of sulfur dioxide in the atmosphere (at a certain season) was approximately 3 weeks, and that the concentration of sulfur dioxide was approximately 2.8 micrograms per cubic meter.Using this information, estimate therate of inflow of sulfur dioxide into a layer of atmosphere 100 meters thick and covering 24,500 square kilometers (the area of Denali National Park).Note:1microgram=10

9

kilograms.

About 88 kilograms per hour

About 14 kilograms per hour

Aboutkilograms per hour

Aboutkilograms per hour

The answer cannot be determined from the information supplied

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Question 21pts

Can small adjustments to a flow lead to large changes in a stock?

Yes. If a penny is deducted from an account of $10,000, that change is large because every penny counts.

There is no way to determine if this is possible.

Yes, given enough time. Even a small change in flow will accumulate over time.

No. Flows can't change in small ways.

No. If the change in the flow is small, the change to the stock must also be small.

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Question 31pts

Imagine an environmental system where the stock of a waste product (like garbage in a landfill or human-generated carbon emissions in the atmosphere) is growing . What are some possible solutions (you may select more than one) to bring the system into equilibrium? Assume all references to flows correspond to the stock of waste.

Export the entire stock to a different country.

Decrease the outflow of waste, for instance, make sure that it does not leak out of the landfill.

Decrease the inflow of waste so the stock grows less rapidly, meaning we reduce the production of waste.

Increase the inflow of waste, meaning accelerate the production of that waste.

Increase the outflow of waste, meaning we should use the waste in a productive way.

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Question 41pts

Consider thestatement: "Cutting carbon emissions by half is an unreasonable goal in the next 35 years. If we cut our energy usage by half, it would send us back 100 years!"Select the choice that best describes the main problem with this statement.

One half equals 50 percent, so cutting out energy usage by half will only send us back 50 years.

Not all energy usage produces carbon emissions; the quote confuses flows from two different systems.

The phrase "cutting carbon emissions by half within 35 years" confuses the stock with the flow

Using technology half as much will not send humans back 100 years; the quote confuses the flow of time with the flow of energy.

There is nothing wrong with this statement.

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Question 51pts

Suppose a shower head pours 1.5 gallons of water per minute into the tub. The drain has a clog and allows for only 0.5 gallons of water per minute to exit the tub. What is the net flow that applies to the tub?

The net flow is 1 gallons per minute out of the tub.

The net flow is 1 gallons per minute into the tub.

It depends how long the water has been flowing.

The net flow is 2 gallons per minute into the tub.

The net flow is 2 gallons per minute out of the tub.