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3 years ago

In electrical work, resistance is often represented by the

Physics

2 answers:

vova2212 [387]3 years ago

7 0

Answer : The correct option is, (a) Greek symbol O

Explanation :

Resistance : It is defined as the property of a material which resist the flow of charges through it.

Resistance is represented as, Ohm, $\Omega$ (in symbol) and uppercase Omega (in Greek symbol).

Hence, in electrical work, resistance is often represented by the Greek symbol O.

motikmotik3 years ago

3 0

In electrical work, resistance is often represented by the Greek symbol <span>Ω. The correct option among all the options that are given in the question is the first option or option "a". It is actually a Greek Letter Omega and is written in upper case. I hope this is the answer you were looking for and it has helped you.</span>

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Two positive charges are fixed a distance apart.the sun of their charges is Qt.what charge must each have in order to maximise t

romanna [79]

Answer:

Both charges must have the same charge, Qt/2.

Explanation:

Let the two charges have charge Q1 and Q2, respectively.

Use Coulombs's Law to find an expression for the force between the two charges.

$F = k_e\frac{Q_1Q_2}{r^2}$ , where

Ke is Coulomb's contant and

r is the distance between the charges.

We know from the question that

Q1 + Q2 = Qt

So,

Q2 = Qt - Q1

$F = k_e\frac{Q_1(Q_t - Q_1)}{r^2}$

Simplify to obtain,

$F = \frac{k_e}{r^2} (Q_tQ_1 - Q_1^2)$

In order to find the value of Q1 for which F is the maximum, we will use the optimization technique of calculus.

Differentiate F with respect to Q1,

$\frac{dF}{dQ_1} = \frac{k_e}{r^2} (Q_t - 2Q_1)$

Equate the differential to 0, to obtain the value of Q1 for which F is the maximum.

$\frac{k_e}{r^2} (Q_t - 2Q_1) = 0\\Q_t - 2Q_1 = 0\\2Q_1 = Q_t\\Q1 = \frac{Q_t}{2}$

It follows that

$Q_2 = \frac{Q_t}{2}$ .

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3 years ago

What is kinematics????

My name is Ann [436]

Answer:

the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion is called kinematics.

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3 years ago

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A shuffle board disk is pushed at a rate of 6.0 m/s over a 10.8 m distance by a player. How long did the player push the disk? A

nekit [7.7K]

It's obvious that 65 s isn't the answer. I'm still doing this question myself

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3 years ago

Which of the following explains how a hypothesis that is NOT supported by the results of an experiment can still be valuable?

dlinn [17]

Answer: hypothesis that is not supported by the results of an experiment may lead to further research and investigations.

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3 years ago

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A stretched string has a mass per unit length of 5.12 g/cm and a tension of 19.3 N. A sinusoidal wave on this string has an ampl

Sati [7]

Answer:

a. 0.143 mm b. 77.6 rad/m c. 483.18 rad/s d. +1

Explanation:

a. ym

Since the amplitude is 0.143 mm, ym = amplitude = 0.143 mm

b. k

We know k = wave number = 2π/λ where λ = wavelength.

Also, λ = v/f where v = speed of wave in string = √(T/μ) where T = tension in string = 19.3 N and μ = mass per unit length = 5.12 g/cm = 5.12 ÷ 1000 kg/(1 ÷ 100 m) = 0.512 kg/m and f = frequency = 76.9 Hz.

So, λ = v/f = √(T/μ)/f

substituting the values of the variables into the equation, we have

λ = √(T/μ)/f

= √(19.6 N/0.512 kg/m)/76.9 Hz

= √(38.28 Nkg/m)/76.9 Hz

= 6.187 m/s ÷ 76.9 Hz

= 0.081 m

= 81 mm

So, k = 2π/λ

= 2π/0.081 m

= 77.6 rad/m

c. ω

ω = angular frequency = 2πf where f = frequency of wave = 76.9 Hz

So, ω = 2πf

= 2π × 76.9 Hz

= 483.18 rad/s

d. The correct choice of sign in front of ω?

Since the wave is travelling in the negative x - direction, the sign in front of ω is positive. That is +1.

4 0

3 years ago