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3 years ago

Suppose you were to fill a balloon with air then let go of it withoutntying it closed. What causes the balloon to fly away?

Physics

2 answers:

antiseptic1488 [7]3 years ago

5 0

Answer:

When a balloon is inflated, the pressure inside the ballon is greater than the pressure outside the balloon. When let go of (or when the balloon is open), the air is released as there is no long a difference in pressure between outside the balloon and inside the balloon. This results in a force in the opposite direction due to the escaping air that provides the force, which causes it to fly away!

Hope this helps :)

tangare [24]3 years ago

3 0

What causes the ballon to fly away is the air pushing out of the balloon also tied in with air pressure

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Answer:

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3 years ago

The temperature of a solution will be estimated by taking n independent readings and averaging them. Each reading is unbiased, w

Viktor [21]

Answer:

68 readings.

Explanation:

We need to take this problem as a statistic problem where the normal distribution table help us.

We can start considerating that X is the temperature of the solution, then

$0.9 = P(|\bar{x}-\mu|$

$0.9 = P(\frac{|\bar{x}-\mu|}{\frac{\sigma}{\sqrt{n}}}$

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For a confidence level of 90% our $Z_{critic}$ is 1.645

Therefore,

$\frac{0.1}{\frac{\sigma}{\sqrt{n}}} = 1.645$

Substituting for $\sigma = 5$ and re-arrange for n, we have that n is equal to

$n=(\frac{1.645\sigma}{0.1})^2$

$n=\frac{(1.645)^2(0.5)^2}{0.1^2}$

$n=67.65$

$n=68$

We need to make 68 readings for have a probability of 90% and our average is within $0.1\°\frac$

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3 years ago

A block and tackle pulley system of 6 pulley uses 300N to overcome 1200N.find efficiency

Fittoniya [83]

Answer:

66.7%

Explanation:

There are 6 pulleys, so the mechanical advantage is 6.

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1200 N / 6 = 200 N

The actual force is 300 N. So the efficiency is:

200 N / 300 N × 100% = 66.7%

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3 years ago

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For example, you forget about a essay that's due the next day. You're pressured to get it done before morning which causes mental stress.

Hope this gives a clear explanation.

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4 years ago