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ladessa [460]
3 years ago
10

The speed an object needs to move away from the gravitational pull of the earth is called

Physics
1 answer:
svetlana [45]3 years ago
6 0
This would be called the "Escape Velocity "
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You have covered a grounded metal surface with a layer of photoconductor. Working in the dark, you sprinkle negative charge onto
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A. the left half becomes neutral while the right half remains negatively charged

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For a particular casting setup, the top of the sprue has a diameter of 0.030 m, and its length is 0.200 m. The volume flow rate
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Answer with Explanation:

We are given that

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d_=0.030 m

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v_1=0.708 m/s

Pressure at the top and bottom of the sprue is atmospheric

h_1+\frac{v^2_1}{2g}=h_2+\frac{v^2_2}{2g}

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v^2_2=2\cdot 9.8\cdot \frac{0.2\cdot 9.8\cdot 2+0.501264}{2\cdot 9.8}=4.421264

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A_2=\frac{5\times 10^{-4}}{2.1}=2.381\times 10^{-4} m^2

Reynolds number=\frac{v_2D\rho}{\eta}

\eta=0.004 N.s/m^2

\rho=2700 kg/m^3

Substitute the values then we get

Reynolds number=\frac{2.1\times 0.03\times 2700}{0.004}

Reynolds number=42525

The Reynolds number is greater than 4000 .Therefore, the flow is turbulent.

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