The total charge on 8 particles is −56 units. All the particles have the same charge.

1 answer:

5 0

You have to divide negative fifty-six by eight to get the charge on each particle. So you do -56/8. Which gives you negative seven as the answer.
Answer = -7

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The mean life of a particular brand of light bulb is 1200 hours. if you know that at about 95% of this brand of bulbs will last

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<span>204
First, lookup a standard normal table and see what the z-score is for 0.025 (one half of 100% - 95%) to allow for equal sized tails. You should find that the z-score is 1.96. That means that 95% of the time, the value should be within 1.96 standard deviations of the mean. Now let's calculate the standard deviation. 800 is 800 - 1200 = -400 to the left of the mean of 1200. 1600 is 1600 - 1200 = 400 to the right of the mean of 1200. So we are an equal distance of 400 on both sides of the mean. And we know from the z-score of 1.96, that we're 1.96 standard deviations from the mean. So a little division will give us the standard deviation. Which is: 400 / 1.96 = 204.0816327
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3 years ago

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ki77a [65]

Answer:

Answer

Let height =h

Total surface area=2πr(r+h)

r=7cm

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×7(7+h)

⇒