Increasing a car's speed from 0 mph to 30 mph requires more work than that of 50 mph to 60 mph.
<h3>What is work?</h3>
Work is a measure of energy expended in moving an object. It is calculated by multiplying the force by the distance.
According to this question, work is required to move a car from one position to another.
The distance moved from 0 - 30mph is more than that moved from 50 - 60mph, therefore, increasing a car's speed from 0 mph to 30 mph requires more work than that of 50 mph to 60 mph.
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<h3><u>Answer;</u></h3>
formed by erosion
River deltas <u>are formed by erosion</u>.
<h3><u>Explanation;</u></h3>
- <em><u>River delta refers to a landform that forms from deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water.</u></em>
- In other words <em><u>river deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river</u></em>. It occurs when a River is entering a sea, an ocean, lake a reservoir or another river that is incapable of carrying the supplied sediment.
- Therefore,<u> deltas are formed as a result of erosion by water</u> which involves the carrying of sediments down the rivers to the mouth of river where it accumulates.
Infrared waves are ineffective for treating cancer because they do not transfer enough energy to destroy cancer cells.
<h3>Importance of high frequency waves</h3>
One of the uses of a high frequency wave is in the treatment of cancer. These high frequency waves transfer enough energy to destroy the cancer cells.
E = hf
where;
- f is frequency of the wave
Infrareds have low frequency, and hence low energy.
Thus, infrared waves are ineffective for treating cancer because they do not transfer enough energy to destroy cancer cells.
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The answer is D, the amount of energy stays the same.
