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frosja888 [35]
3 years ago
6

Which of the following statements is true? A. All metals are magnetic. B. All the magnets are made of iron. C. Earth is a giant

magnet.
Physics
1 answer:
harina [27]3 years ago
3 0

C. Earth <em>is </em>a giant magnet

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The radius of the earth is 6378 km. What is the diameter of the earth in meters?
Nesterboy [21]
To determine the diameter of the earth in metres first multiply the original value by 2.

6378 X 2 = 12 756 km.

Then convert km - m

1 km = 1000 m
12 756 km = ? m

12 756 • 1000 = 12 756 000 = 12 756 000 m or 1.2756 X 10 ^ 7 m

The final solution for the diameter is 1.2756 X 10 ^ 7 m.
7 0
3 years ago
A circular loop of wire with a diameter of 0.626 m is rotated in a uniform electric field to a position where the electric flux
Mila [183]

Answer:

C) 2.44 × 106 N/C

Explanation:

The electric flux through a circular loop of wire is given by

\Phi = EA cos \theta

where

E is the electric field

A is the cross-sectional area

\theta is the angle between the direction of the electric field and the normal to A

The flux is maximum when \theta=0^{\circ}, so we are in this situation and therefore cos \theta =1, so we can write

\Phi = EA

Here we have:

\Phi = 7.50\cdot 10^5 N/m^2 C is the flux

d = 0.626 m is the diameter of the coil, so the radius is

r = 0.313 m

and so the area is

A=\pi r^2 = \pi (0.313 m)^2=0.308 m^2

And so, we can find the magnitude of the electric field:

E=\frac{\Phi}{A}=\frac{7.50\cdot 10^5 Nm^2/C}{0.308 m^2}=2.44\cdot 10^6 N/C

3 0
3 years ago
If an experiment used 945 j of heat, how many calories (cal) is that?
irina1246 [14]
There are approximately two hundred and twenty-five point seven five calories from using 945 j of heat

A: 225.75
5 0
3 years ago
Two parallel square metal plates that are 1.6 cm apart and 24 cm on each side carry equal but opposite charges uniformly spread
Fiesta28 [93]

The amount of extra electrons present on the negative surface is

57.2 x 10^{10}.

Distance =1.6 cm

Side = 24 cm

Electric field = 18000 N/C

Calculating the capacitance in the metal plates is necessary.

Using the capacitance formula

C=\frac{e_{0}A }{d}

Putting the value

C = 8.85 x 10^{-12}x (24 x 10^{-2})^{2}/1.6 x 10^{-2}

C = 0.318 x 10^{-10} F

<h3>Calculation of potential</h3>

V = Ed

V = 18000 x 1.6 x 10^{-2} V

V = 288 V

<h3>Calculation of charge</h3>

Q = CV

Q = 0.318 x 10^{-10} x 288

Q = 91.54 x 10^{-10} C

Charge on the both the plates

Q = +91.54 x 10^{-10}

Q = - 91.54 x 10^{-10}

Calculation of excess electrons on the negative surface:

n = q/e

n = 91.54 x 10^{-10}/ 1.6 x 10^{-19}

n = 57.2 x 10^{10} electrons

Hence, the number of excess electrons on the negative surface is

57.2 x 10^{10}.

Learn more about capacitance here:

brainly.com/question/14746225

#SPJ4

8 0
11 months ago
Please help!!!
iVinArrow [24]

A).  Her distance traveled was (700m + 500m) = <em>1,200 meters</em>

B).  Her displacement was (700m north + 500m south) = <em>200 meters north</em>

C).  Her average speed = (distance covered) / (time to cover the distance)

Speed = (1,200 meters) / (15 seconds)

<em>Speed = 80 meters/second</em>

(Layne is an incredible walker !  That's about 179 miles per hour.)

(She walks 700m in 10 seconds.  Usain Bolt runs only 100m in 10 seconds.)

D).  Her averge velocity = (displacement) / (time)

Velocity = (200 meters north) / (15 seconds)

<em>Velocity = (13 and 1/3) m/s north</em>

(This is only about 33% faster than Usain Bolt, if he went straight instead of doubling back, and if he could keep it up for 200 meters instead of only 100 meters.)

6 0
2 years ago
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