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N76 [4]
3 years ago
5

Water emerges straight down from a faucet with a 2.51-cm diameter at a speed of 3.04 m/s. (because of the construction of the fa

ucet, there is no variation in speed across the stream.) what is the diameter of the stream 0.200 m below the faucet? neglect any effects due to surface tension.
Physics
1 answer:
Mkey [24]3 years ago
3 0
This is a question on conservation of energy. That is,
mgh + KE1 = KE2
mgh +1/2mv1^2 = 1/2mv2^2
gh + 1/2v1^2 = 1/2v2^2

Where, h = 0.2 m, v1 =3.04 m/s
Therefore,
v2 = Sqrt [2(gh+1/2v1^2)] = Sqrt [2(9.81*0.2 + 1/2*3.04^2)] = 7.26 m/s

Now, Volumetric flow rate, V/time, t = Surface area, A*velocity, v
Where,
V = Av = πD^2/4*3.04 = π*(2.51/100)^2*1/4*3.04 = 1.504*10^-3 m^3/s

At 0.2 m below,
V = 1.504*10^-3 m^3/s = A*7.26
A = (1.504*10^-3)/7.26 = 2.072*10^-4 m^2

But, A = πr^2
Then,
r = Sqrt (A/π) = Sqrt (2.072*10^-4/π) = 0.121*10^-3 m
Diameter = 2r = 0.0162 m = 1.62 cm
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sukhopar [10]

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Mass and height

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Answer:

Explanation:

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A mirror – A smooth surface, usually made of glass with reflective material painted on the underside, that reflects light so as to give an image of what is in front of it.

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Refracting telescopes – are telescopes that use lenses are and those that use concave parabolic mirrors are called reflecting telescopes. 

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• reflect all wavelengths of light equally

• more magnification power for cheaper version

Cons of mirror prisms

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Pros of Lenses telescope

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disadvantage:

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Pros of Prism periscopes

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• May be fitted with additional optical capabilities such as range-finding and targeting.

Cons.

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Ungainly (long, takes up space)

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Cons- This system has the disadvantage increasing the length of the telescope.

Mirror- Terrestrial telescope (Cassegrain)

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Cons- It is not what people expect a telescope to look like.

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