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strojnjashka [21]
3 years ago
12

20 pts !!!!

Physics
1 answer:
garri49 [273]3 years ago
4 0
Am not really sure but what i see is D
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What is the answer!!!!!!!!!!!!!
alex41 [277]
I think it might be B. 
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Materials with resistivities between those of good conductors and those of insulators are called:
bogdanovich [222]

semiconductors ... silicon, germanium etc ...

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A fire hose 5 centimeters in diameter is used to fill a 225-liter bucket. If it takes 15 seconds to fill the bucket, what is the
Vika [28.1K]
I believe you ask about speed at the end of the hose:

The volume of the bucket is 225 liters which is equal to 225 dm^{3}.
V=225dm^{3}
Hose's cross section can be counted with the typical circle's area formula (with diameter instead of radius, that's why you've got a fraction):
A=3,14*\frac{d^{2}}{4}}=0,19625dm^{2}

225dm^{3} are filled within 15 second.

As the bucket is being filled you can say that it's volume is the volume of the water that flowed out of the hose, then:
V=A*h
The speed of the water can be counted with equation:
v=\frac{h}{t}
After extracting h from the volume's equation you get:
v=\frac{V}{A*t}
When you count the fraction you get the answer:
v=76,43\frac{dm}{s}=0,7643\frac{m}{s}


4 0
3 years ago
Khalad is measuring the amplitude of a wave. What can be known about this wave?
GalinKa [24]
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Assuming that the limits of the visible spectrum are approximately 380 and 700 nm, find the angular range of the first-order vis
ch4aika [34]

Answer:

angular range is ( 0.681 rad , 0.35 rad )

Explanation:

given data

wavelength λ = 380 nm = 380 × 10^{-9} m

wavelength λ  = 700 nm =  700 × 10^{-9} m

to find out

angular range of the first-order

solution

we will apply here slit experiment equation that is

d sinθ = m λ    ...........1

here m is 1 for single slit and d is = \frac{1}{900*10^3 m}

so put here value in equation 1 for 380 nm

we get

d sinθ = m λ

\frac{1}{900*10^3} sinθ = 1 × 380 × 10^{-9}

θ = 0.35 rad

and for 700 nm

we get

d sinθ = m λ

\frac{1}{900*10^3} sinθ = 1 × 700 × 10^{-9}

θ = 0.681 rad

so angular range is ( 0.681 rad , 0.35 rad )

3 0
4 years ago
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