3 years ago

Adding more pulleys to a system of pulleys _____ needed to lift an object.

Physics

1 answer:

-Dominant- [34]3 years ago

3 0

I think it’s D-decreases the amount of work.

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2 years ago

Please help on this one?

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The correct answer for this problem is c

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Which of the following best explains why snow predictions by meteorologists are sometimes incorrect?

den301095 [7]

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C. Interference from the sun causes data to be collected inaccurately.

Explanation:

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2 years ago

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A hose directs a horizontal jet of water, moving with a velocity of 20m/s, on to a vertical wall. The

just olya [345]

Force is defined as the rate of change of momentum.
The initial amount of momentum is $mv$ because water stops when it hit the wall total change of momentum must be $\Delta p=mv$ .
Now let's calculate the force.
$F= \frac{dp}{dt}=\frac{d(mv)}{dt}=\frac{dm}{dt}v$
We need to find $\frac{dm}{dt}$ . This is the amount of water hiting the wall per second.
$\frac{dm}{dt}=\rho Av$
Our final formula would be:
$F=\rho Avv=\rho Av^2$
And now we can calculate the answer:
$F=1000\cdot5\cdot 10^{-4}\cdot(20)^2=200 N$

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3 years ago