The 20 or so minerals that make up most of the rocks of earth's crust are know as what

Physics

1 answer:

STALIN [3.7K]3 years ago

7 0

Rock-forming minerals because they formed the earths crust

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Calculate the size of the magnetic field 20 m below a high voltage power line. The line carries 450 MW at a voltage of 300,000 V

Stells [14]

Answer:

$1.5 \times 10^{-5} \mathrm{~T}$ .

Explanation:

Power carried by the line $=P=450 \mathrm{MW}=450 \times 10^{6} \mathrm{~W}$

Voltage across the line Volts

Current flowing in the line =i

Size of magnetic field =B

Distance from the line

Formula Used:

Current flowing is given as

$i=\frac{P}{\Delta V}$

Magnetic field by the current carrying wire is given as

$B=\left(\frac{\mu}{4 \pi}\right)\left(\frac{2 i}{r}\right)$

Inserting the values

$B=\left(10^{-7}\right)\left(\frac{2(1500)}{(20)}\right) \\
B=1.5 \times 10^{-5} \mathrm{~T}$

Conclusion:

Thus, the magnetic field comes out to be $1.5 \times 10^{-5} \mathrm{~T}$ .

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A rectangular block measures 8cm by 5cm by 4cm, a mass of 1.25kg what is the volume of the block

Burka [1]

To calculate the volume of a rectangular, we have to multiply the value of height, length and width.

8x5x4 = 160 cm ^3

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