Answer:
The answer to your question is the second and the last choices.
Step-by-step explanation:
Process
1.- In the first step v₀t subtract d and the result is
d - v₀t = at²/2
2.- In the second step, 2 multiply (d - v₀t), and the result is
2(d - v₀t) = at²
3.- In the third step t² divide 2(d - v₀t), and the result is
a = [2(d - v₀t)]/t²
The answer is A. The vast majority of our energy generation still comes from fossil fuels such as coal, oil, and natural gas, all of which result in carbon dioxide and pollutant emissions to the atmosphere.
Solar panels using sunlight is not an issue, because sunlight is virtually unlimited to us right now.
Wind turbines varying power supply is not an environmental issue but a reliability one, and this is often solved by linking wind energy with others like solar or hydropower. Either way, this does not have significant environmental impact.
People living close together is not an environmental impact either. This is more for efficient distribution of power, such as through electric substations and power lines.
Answer:
40 mph
Step-by-step explanation:
We assume "outbound" refers to the trip <em>to the lake</em>. The ratio of speeds is inversely proportional to the ratio of times, so ...
outbound speed : inbound speed = 4 : 3
These differ by one ratio unit, so that one ratio unit corresponds to the speed difference of 10 mph. Then the 4 ratio units of outbound speed will correspond to ...
4×10 mph = 40 mph
Paul's average speed on the outbound trip was 40 mph.
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The distance to the lake was 120 mi.
