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Pachacha [2.7K]
3 years ago
14

Pail of WaterSuppose you wish to whirl a pail full of water in a vertical circle at a constant speed without spilling any of its

contents (even at the top of the circle!). If your arm is 0.70 m long (from shoulder to fist) and the distance from the handle to the surface of the water is 15.0 cm, what minimum speed is required?
Physics
1 answer:
Studentka2010 [4]3 years ago
3 0

Answer:

Velocity will be 2.886 m/sec  

Explanation:

We have given arm length = 0.70 m

And distance from the handle to surface = 15 cm =0.15 m

So total distance r = 0.70+0.15 = 0.85

We know that acceleration is given by a=\frac{v^2}{r}

Here acceleration is acceleration due to gravity so a=g

So g=\frac{v^2}{r}

v=\sqrt{rg}=\sqrt{0.85\times 9.8}=2.886m/sec

So velocity will be 2.886 m/sec

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Studentka2010 [4]
Direction!

Velocity is a vector quantity and speed is a scalar quantity. Vector quantities includes both magnitude and direction, while scalar quantities only have magnitude. :)
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Maurinko [17]
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6 0
3 years ago
on aircraft carriers, catapults are used to accelerate jet air craft to flight speeds in a short distance. One such catapult tak
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Acceleration = (change in speed) / (time for the change)

Change in speed = (speed at the end) - (speed at the beginning)

The jet's change in speed = (70 m/s) - (zero) = 70 m/s

So acceleration = (70 m/s) / (2.5 s)

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That's about 2.9 G's .  Jet pilots can endure a lot more than that, but maybe the catapult or the hook on the airplane can't.  Let's look a little closer:

F = m A (Newton #2)

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That's about 113,000 pounds !  Maybe the part of the airplane that the catapult pushes on can't handle any more force than that.  Or maybe that's the most force the catapult can deliver.

Also, the REACTION force on the catapult is the same 113,000 pounds.  Maybe the hooks or the chains or the struts on the catapult can't handle any more force than that.

That's almost 57 tons for gosh sakes !  Maybe the DECK of the carrier can't handle more force than that, and that's why they can't launch the airplane with acceleration of more than 2.9 G's .

8 0
3 years ago
A wave with a frequency of 80 Hz travels through rubber with a wavelength of 7.0 m. What is the velocity of the wave?
Scorpion4ik [409]

Answer:

560 m/s

Explanation:

Given,

Frequency ( f ) = 80 hz

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Formula : -

v = f λ

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Hence, the velocity of the wave is 560 m/s.

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32 degrees Fahrenheit
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