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3 years ago

15

when a skydiver jumps out of a plane, the speed at which he or she falls continues to increase. what force is responsible for th

is increase in speed? URGENT

1 answer:

bulgar [2K]3 years ago

4 0

Gravity is pulling down the skydiver. The answer is gravity. HOPE I HELPED! :)

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A spherical capacitor contains a charge of 3.00 nC when connected to a potential difference of 230 V. If its plates are separate

Assoli18 [71]

Answer:

Part(a): the capacitance is 0.013 nF.

Part(b): the radius of the inner sphere is 3.1 cm.

Part(c): the electric field just outside the surface of inner sphere is $\bf{2.81 \times 10^{4}~n~C^{-1}}$ .

Explanation:

We know that if 'a' and 'b' are the inner and outer radii of the shell respectively, 'Q' is the total charge contains by the capacitor subjected to a potential difference of 'V' and ' $\epsilon_{0}$ ' be the permittivity of free space, then the capacitance (C) of the spherical shell can be written as

$C = \dfrac{4 \pi \epsilon_{0}}{(\dfrac{1}{a} - \dfrac{1}{b})}~~~~~~~~~~~~~~~~~~~~~~~~~~~(1)$

Part(a):

Given, charge contained by the capacitor Q = 3.00 nC and potential to which it is subjected to is V = 230V.

So the capacitance (C) of the shell is

$C &=& \dfrac{Q}{V} = \dfrac{3 \times 10^{-90}~C}{230~V} = 1.3 \times 10^{-11}~F = 0.013~nF$

Part(b):

Given the inner radius of the outer shell b = 4.3 cm = 0.043 m. Therefore, from equation (1), rearranging the terms,

$&& \dfrac{1}{a} = \dfrac{1}{b} + \dfrac{1}{C/4 \pi \epsilon_{0}} = \dfrac{1}{0.043} + \dfrac{1}{1.3 \times 10^{-11} \times 9 \times 10^{9}} = 31.79\\&or,& a = \dfrac{1}{31.79}~m = 0.031~m = 3.1~cm$

Part(c):

If we apply Gauss' law of electrostatics, then

$&& E~4 \pi a^{2} = \dfrac{Q}{\epsilon_{0}}\\&or,& E = \dfrac{Q}{4 \pi \epsilon_{0}a^{2}}\\&or,& E = \dfrac{3 \times 10^{-9} \times 9 \times 10^{9}}{0.031^{2}}~N~C^{-1}\\&or,& E = 2.81 \times 10^{4}~N~C^{-1}$

3 0

2 years ago

On which date is the gravitational force between Earth and the moon the greatest?

Genrish500 [490]

The gravitational forces between the Earth and Moon are greatest when the two bodies are closest together. That happens every 27.32 days, when the Moon is at the perigee of its orbit.

Even if this happened at the same time in every orbit, the date would change, because there are not 27.32 days in a month.

But it doesn't happen at the same time in every orbit ... the Moon's perigee precesses around its orbit, on account of the gravitational forces toward the Earth, the Sun, Venus, Mars, and the other planets.

3 0

3 years ago

answer questions1) The south pole of the steel magnet will be brought closer to the iron nail head. Which pole will be at the po

Anvisha [2.4K]

Answer:

North pole

Explanation:

According to the law of magnetism:

<em>Unlike poles attract while like poles repel</em>

Since the south pole of the steel is brought near the nail, and the nail is meant to attract the steel magnet, the nail domain realigns itself to produce a pole opposite to the pole of the steel magnet brought near it.

Since the North pole is the opposite of the south pole, the North pole will be at the pointed end of the nail so that it can attract the steel magnet.

8 0

10 months ago

Somebody please help me

Ksju [112]

The conversion steps listed above in order from start to finish are already in an arranged form from 1-4.

<h3>What is a biosphere?</h3>

A biosphere can be defined as the part of the earth that supports life. These include :

aquatic,

desert,

forest,

grassland and

tundra.

The flow of energy through the biosphere includes

Energy from the sun which is as a result of the nuclear fusion,

the energy released is absorbed by plant chlorophyll,

Chemical energy is released during respiration.

Photosynthesis converts carbon dioxide and water into glucose and oxygen.

Learn more about biosphere here:

brainly.com/question/12467010

#SPJ1

4 0

2 years ago

Before the invention of a wheel turning on an axle, ancient people moved heavy loads by placing rollers under them. (Modern peop

matrenka [14]

Answer: $K.E.=36.277+1.0429=37.319 J$

Explanation:

Velocity of Top most point of wheel is twice the Velocity of centre of mass of wheel

$i.e V_{wheel}=2V_{cm}=0.319 m/s$

Thus angular velocity is given by

$\omega =\frac{V_{cm}}{R}$

$\omega =0.465 rad/s$

$Kinetic\ Energy=Rotational + transtational$

$K.E.=\frac{1}{2}m_{stone}V^2+2\left [ \frac{1}{2}m_{cyl}\left [ \frac{V}{2}\right ]^2\right ]+2\left [ \frac{1}{2}I\omega ^2\right ]$

$K.E.=\frac{V^2}{2}\left [ m_{stone}+\frac{m_{roller}}{2}\right ]+I\omega ^2$

$K.E.=\frac{0.319^2}{2}\left [ 672+\frac{82}{2}\right ]+\frac{82\times 0.343^2\times 0.465^2}{2}$

$K.E.=36.277+1.0429=37.319 J$

3 0

3 years ago