3 years ago

When objects are charged by _______, they do not need to touch each other.

Physics

1 answer:

Deffense [45]3 years ago

6 0

C because conduction you don’t need to touch anything

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A flea jumps straight up to a maximum height of 0.490 m . What is its initial velocity v0 as it leaves the ground?

zzz [600]

Answer:

$\huge\boxed{\sf v_o=3.1\ m/s}$

Explanation:

Given Data:

Acceleration due to gravity = g = -9.8 m/s²

Maximum Height = h = 0.490 m

At h, $v_f$ = 0

Required:

$v_o=?$

Formula:

$2gh=v_f^2-v_o^2$

Solution:

Put the givens

$2 (-9.8) (0.490) = (0)\² - v_o^2\\\\-9.604=-v_o^2\\\\9.604=v_o^2\\\\Take \ sqrt\ on \ both \ sides\\\\\sqrt{9.604}=v_o^2\\\\3.1 \ m/s=v_o\\\\v_o=3.1\ m/s\\\\\rule[225]{225}{2}$

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2 years ago

As electricity flows through a wire, what type of field is created around the wire?

aleksklad [387]

A magnetic field. that's how people make magnets, by wrapping copper wire around whatever they want to be magnetic then running electricity through the wire. it works on revers to make electricity.

6 0

3 years ago

What is the wavelength of a soundwave moving at 340 m/s with a frequency of 265 Hz?

lyudmila [28]

Wave speed = frequency * wavelength
Rearrange so it's equal to wavelength. Do this by diving both sides by frequency to leave you with:
Wave speed / frequency = wavelength
340 / 265 = 1.2830 m

4 0

3 years ago

what is the voltage in mv across an 5.5 nm thick membrane if the electric field strength across it is 5.75 mv/m? you may assume

inn [45]

Answer:

V = 31.62 m V

Explanation:

Given,

Voltage across thick membrane = ?

Thickness of the membrane, d = 5.5 n m

Electric field = 5.75 M V/m

we know

$E = \dfrac{V}{d}$

V = E d

V = 5.75 x 10⁶ x 5.5 x 10⁻⁹

V = 31.62 x 10⁻³ V

V = 31.62 m V

Hence, The Voltage across the membrane is equal to 31.62 m V.

3 0

4 years ago

A wave has a wavelength of 5mm and a frequency of 10 hertz what is its speed? answer: units:

gayaneshka [121]

Speed=wavelength×frequency
speed= 0.005m × 10 Hz = 0.05m/s

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3 years ago