What is the net force on an object when you combine a force of 10n north with a force of 5n south?

The magnitude J of the current density in a certain wire with a circular cross section of radius R = 2.11 mm is given by J = (3.

oksano4ka [1.4K]

Answer:

$i = 2.84 \times 10^{-3} A$

Explanation:

As we know that current density is ratio of current and area of the crossection

now we have

$J = \frac{di}{dA}$

so the current through the wire is given as

$i = \int J dA$

now we have

$i = \int_{0.921R}^R J dA$

here we have

$J = (3.25 \times 10^8)r^2$

now plug in the values in above equation

$i = \int_{0.921R}^R (3.25 \times 10^8)r^2 2\pi r dr$

now we have

$i = \int_{0.921R}^R 2\pi (3.25 \times 10^8)r^3 dr$

$i = (2.04 \times 10^9) \frac{r^4}{4}$

now plug in both limits as mentioned

$i = (2.04 \times 10^9)(\frac{R^4}{4} - \frac{(0.921R)^4}{4})$

$i = (2.04\times 10^9)(0.07 R^4)$

here R = 2.11 mm

$i = (2.04 \times 10^9)(0.07 (2.11 \times 10^{-3})^4)$

$i = 2.84 \times 10^{-3} A$

8 0

3 years ago

The boiling point of water is 91.30 °C on the

Taya2010 [7]

Answer:

196.34 °F

Explanation:

To convert from degrees celsius to degrees fahrenheit, use this equation:

(°C * 9/5) + 32 = °F

So, using this equation:

(91.30 * 9/5) + 32 = °F

196.34 + 32 = °F

°F = 196.34

Hope this helps!

3 0

3 years ago

Find the resultant of two forces of 4.0N and 6.0N acting at an angle of 160° to each other.

hichkok12 [17]

$\star\sf \overrightarrow{A}=4N$

$\star\sf\overrightarrow{B}=6N$

Angle=160

$\boxed{\sf R=\sqrt{A^2+B^2+2ABcos\theta}}$

$\\ \sf\longmapsto R=\sqrt{4^2+6^2+2(4)(6)cos160}$

$\\ \sf\longmapsto R=\sqrt{16+36+48(-0.93)}$

$\\ \sf\longmapsto R=\sqrt{52-44.6}$

$\\ \sf\longmapsto R=\sqrt{7.4}$

$\\ \sf\longmapsto R=2.7N$

6 0

3 years ago

To correct myopia (nearsightedness) requires ___________ lenses; to correct hyperopia (farsightedness) requires _____________ le

zysi [14]

By using concave lens, we can correct Myopia and Hyperopia can be corrected by convex lenses.

To find the answer, we need to know about Myopia and Hyperopia.

<h3>What is Myopia and Hyperopia?</h3>

Myopia is an optical defect, in which a person can see nearby objects clearly and cannot see far off objects clearly.
Here the eyeball becomes too longer, and the focal length of eye lens become too short.
It can be corrected by using concave lens.
For Hyperopia, the person can see far off objects clearly and cannot see nearby objects clearly.
This can be corrected by using convex lens.

Thus, we can conclude that, by using concave lens, we can correct Myopia and Hyperopia can be corrected by convex lenses.

Learn more about Myopia and Hyperopia here:

brainly.com/question/28052359

#SPJ1

4 0

2 years ago

Read 2 more answers

Dust and gas are pulled together by the force known as what?

olga nikolaevna [1]

Answer:

Gravity

Explanation:

In astronomy, dust and gas get pulled together by gravity forming Nebula's, famous nebula's include the Crab Nebula, Orion Nebula and Helix Nebula.

Most of the Nebula's consist of hydrogen.

5 0

4 years ago