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fgiga [73]
3 years ago
10

A quelle distance le soletl se trouve-t-il de la terre?

Physics
1 answer:
Mnenie [13.5K]3 years ago
5 0

The explanation for the following answer is explained below.

Explanation:

The sun is at an average distance of about 93,000,000 miles(150 million kilometers) away from the earth.It is so far away that light from the Sun,travelling at a speed of 186,000 miles (300,000 kilometers) per second, takes about 8 minutes to reach the earth.Earth does not travel around the Sun in a perfect circle.Instead its orbit is elliptical,like a stretched circle,with the sun just off the center of the orbit. At its closest,the Sun is 91.4 million miles (147.1 million kilometers ) away us.At its farthest ,the Sun is 94.5 million miles (152.1 million km) away.The Earth is closest to the Sun during winter in the northern hemisphere

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The graph at the right shows the force needed to pull a bow back as the string is pulled further and further.
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A. 9 J

In a force-distance graph, the work done is equal to the area under the curve in the graph.

In this case, we need to extrapolate the value of the force when the distance is x=30 cm. We can easily do that by noticing that there is a direct proportionality between the force and the distance:

F=kx

where k is the slope of the line. We can find k, for instance chosing the point at x=5 cm and F=10 N:

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And now we can calculate the work by calculating the area under the curve until x=30 cm, F=60 N:

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B. 24.5 m/s

The mass of the arrow is m=30 g=0.03 kg. The kinetic energy of the arrow when it is released is equal to the work done by pulling back the bow for 30 cm:

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where m is the mass of the arrow and v is its speed. By re-arranging the formula and using W=9 J, we find the speed:

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