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mafiozo [28]
3 years ago
15

3- Define light year. What quantity does it measure? what is one light year equal to in sl unit?​

Physics
1 answer:
VashaNatasha [74]3 years ago
8 0
The light-year is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometres (9.46×1012 km) or 5.88 trillion miles (5.88×1012 mi).
Astronomical units: 63241 au; 0.3066 pc
Metric (SI) units: 9.4607×1015 m; 9.46075 Pm
Imperial & US units: 5.8786×1012 mi
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hichkok12 [17]

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You throw a ball upward from a window at a speed of 2.0 m/s. the ball accelerates at 9.8 m/s2. how fast is it moving when it hit
Nastasia [14]
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4 years ago
A 5.0 mm diameter proton beam carries a total current of 1.5mA. The current density in the proton beam, which increases with dis
slavikrds [6]

Answer:

Jedge = 0.076A/cm^2

Explanation:

If you want to know what is Jedge is convenient to use an integral. The total density current is given by:

J_T=\int_{0}^{R}J_{edge}(\frac{r}{R})dr=J_{edge}(\frac{1}{R})(\frac{R^2}{2})=\frac{J_{edge}R}{2}  (1)

But also, we have that the total current is

I_T=J_TA\\\\J_T=\frac{I_T}{A}=\frac{1.5*10^{-3}A}{\pi(5*10^{-3})^2}=19.09\frac{A}{m^2}

where we have used that 5mm=5*10^{-3}m.

By replacing (1) we obtain:

J_{edge}=\frac{2J_T}{R}=\frac{2(19.09A/m^2)}{5*10^{-3}m}=7639.4\frac{A}{m^2}=0.076\frac{A}{cm^2}

hope this helps!!

3 0
4 years ago
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