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djverab [1.8K]
3 years ago
8

Scientists and engineers are working to develop ways to replace corn with a different plant, such as switchgrass, in the product

ion of ethanol. This is largely because using corn to produce ethanol could cause a problem for society. Which of the following statements best describes this problem?
A. Chemical processes do not exist that can transform corn's sugars into ethanol.
B. Grass resources are scarce and could be used up if harvested to produce ethanol.
C. Harvesting corn for ethanol could come into conflict with harvesting corn for food.
D. Chemical processes do not exist that can release the chemical energy in ethanol.
Physics
1 answer:
Alja [10]3 years ago
3 0

Answer:

C

Explanation:

Using corn to produce ethanol will significantly reduce the amount of corn, available for the food industry. Note, that corn is used not only as a food for people, but also as a good source of energy for the animals due to its high productivity. As the amount of the farming soil is limited and the humanity is facing the lack of the food already, utilizing the corn to make ethanol, specially in high volumes, will have further negative impact on the starving people. In addition, note, that ethanol will be used by rich people, who already have good access to the food, so low income society will face further issues.

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Can someone help me?!!!!!
german
<h2>Hello!</h2>

The answer is:

The first option,  the walker traveled 360m more than the actual distance between the start and the end points.

Why?

Since each block is 180 m long, we need to calculate the vertical and the horizontal distance, in order to calculate how farther did the travel walk between the start and the end points (displacement).

So, calculating we have:

Traveler:

Distance=NorthCoveredDistance+EastCoveredDistance

Distance=4*180m+3*180m=720m+540m=1260m

Actual distance between the start and the end point (displacement):

ActualDistance=\sqrt{NorthDistance+EastDistance}\\\\ActualDistance=\sqrt{NorthDistance^{2} +EastDistance^{2}}\\\\ActualDistance=\sqrt{(720m)^{2} +(540m)^{2}}\\\\ActualDistance=\sqrt{518400m^{2} +291600m^{2}}\\\\ActualDistance=\sqrt{810000m^{2}}=900m

Now, to calculate how much farter did the traveler walk, we need to use the following equation:

DistanceDifference=WalkerCoveredDistance-ActualDistance\\\\DistanceDifference=1260m-900m=360m

Therefore, we have that distance differnce between the distance covered by the walker and the actual distance is 360m.

Hence, we have that the walker traveled 360m more than the actual distance between the start point and the end point.

Have a nice day!

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3 years ago
A motorcycle, which has an initial linear speed of 9.7 m/s, decelerates to a speed of 4.0 m/s in 4.4 s. Each wheel has a radius
Morgarella [4.7K]

Hi there!

We can begin by solving for the linear acceleration as we are given sufficient values to do so.

We can use the following equation:

vf = vi + at

Plug in given values:

4 = 9.7 + 4.4a

Solve for a:

a = -1.295 m/s²

We can use the following equation to convert from linear to angular acceleration:

a = αr

a/r = α

Thus:

-1.295/0.61 = -2.124 rad/sec² ⇒ 2.124 rad/sec² since counterclockwise is positive.

Now, we can find the angular displacement using the following:

θ = ωit + 1/2αt²

We must convert the initial velocity of the tire (9.7 m/s) to angular velocity:

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Plug into the equation:

θ = 15.9(4.4) + 1/2(2.124)(4.4²) = 20.56 rad

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