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3 years ago

How does electricity work in a vacuum

Physics

1 answer:

Tpy6a [65]3 years ago

3 0

Answer:

Explanation:

Electricity is a flow of electrons. Electrons can flow across a vacuum. ... They need to leap because the vacuum is a perfect insulator and so there is no medium in which they can flow (like through a metal conductor) so they must aquire all of the energy necessary to cover the distance before they can escape the cathode.

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Jupiter's semimajor axis is 7.78×1011 m. The mass of the Sun is 1.99×1030 kg. (a) What is the period of Jupiter's orbit in secon

dedylja [7]

Explanation:

It is given that,

Semi major axis of the Jupiter, $a=7.78\times 10^{11}\ m$

Mass of the sun, $M=1.99\times 10^{30}\ kg$

(a) Let T is the period of Jupiter's orbit. It is given by :

$T^2\propto a^3$

$T^2=\dfrac{4\pi^2}{GM}a^3$

$T^2=\dfrac{4\pi^2}{6.67\times 10^{-11}\times 1.99\times 10^{30}}\times (7.78\times 10^{11})^3$

$T=3.74\times 10^8\ s$

(b) We know that,

$1\ year=3.154\times 10^7\ s$

$1\ s=3.171\times 10^{-8}\ year$

$3.74\times 10^8\ s={3.171\times 10^{-8}}\times {3.74\times 10^8}$

T = 11.859 earth years

Hence, this is the required solution.

7 0

3 years ago

Read 2 more answers

Which state(s) of matter is/are made up of atoms and molecules that have a comparatively high amount of kinetic energy, which al

Rom4ik [11]

Answer:

A. gas only

Explanation:

In a gas, the molecules are in continuous, random, straight-line motion.

The molecules are independent of one another i.e The forces of attraction (cohesive forces) and repulsion between the molecules are small and negligible,As such they possess greater kinetic energy which allows them to break the force of attraction between them

In liquid, the molecules have a less random pattern of motion and they can only slide past one another.

In solid, the motion are restricted to a small place as the molecules are not free to move about but merely vibrate about their lattice points.

7 0

3 years ago

You're designing an airport.A plane that will use this airport must reach a speed of Vmin=100km/h(27.8m/s).It can accelerate at

Ilia_Sergeevich [38]

As here it is given that

x = 150 m

a= 2 m/s^2

now initial speed of the plane must be zero as it start from rest

now we will use kinematics

$v_f^2 - v_i^2 = 2 a x$

$v_f^2 - 0 = 2(2)(150)$

$v_f =\sqrt{600} = 24.5 m/s$

so its final speed is maximum 24.5 m/s

so it will not reach to desired speed at the end of runway

5 0

3 years ago

A substance is round in one container and has a volume of one liter. In a much larger container, the substance is rectangular bu

insens350 [35]

Answer:

Liquid

Explanation:

Solids do not change shape, so we know it's not a solid.

Gases take the shape of their container, but they also expand to the volume of the container. The substance in this problem has the same volume in different size containers, so we know it's not a gas.

The substance must be a liquid. It takes the shape of its container but has a constant volume.

8 0

3 years ago

A car travels at 40km/hr for 2 hours and at 55 km/hr for 2 hours. How far has the car traveled? What is its average velocity?

anastassius [24]

So if a car was moving 40km/hr, it means in 1 hour, the car will travel 40km. Since the car goes for 2 hours, the car will have traveled for 80 miles. Same.for the car going 55km/hr for 2 hours. 55 times 2 is 110km. 110 + 80 = 190km total. You can find the average velocity by by the distance traveled divided by how much time elapsed. so 190 divided by 4 is 47.5. So the distance traveled is 190km, and the average velocity is 47.5

8 0

3 years ago