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3 years ago

Need help asap!

Physics

2 answers:

Tju [1.3M]3 years ago

5 0

Answer: Option (1) is the correct answer.

Explanation:

Conductors are the substances that allow electric current to easily pass through it. On the other hand, insulators are the substances that does not allow the flow of electric current easily.

For example, a copper metal plate is a good conductor of electricity and a glass is an insulator.

So, when a glass is placed in contact with a copper metal plate then electric current can flow from copper plate to the glass.

Hence, we can conclude that description which correctly describes a way of electrical transfer is that electrons are transferred between a conductor and insulator by means of contact.

nikdorinn [45]3 years ago

4 0

As it stands, none of the choices is correct.

I have a hunch that you copied either #3 or #4 incorrectly.

One of those ... either choice-3 or choice-4 ... is supposed to say "<u><em>Conductors</em></u> allow electrons to flow through an object by conduction". that would be the correct choice.

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A pendulum of length L=36.1 cm and mass m=168 g is released from rest when the cord makes an angle of 65.4 degrees with the vert

pychu [463]

(a) -0.211 m

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$\theta=65.4^{\circ}$

The projection of the length of the pendulum along the vertical direction is

$L_y = L cos \theta = (36.1 cm)(cos 65.4^{\circ})=15.0 cm$

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(b) 0.347 J

The work done by gravity is equal to the decrease in gravitational potential energy of the mass, which is equal to

$\Delta U = mg \Delta y$

where we have

m = 168 g = 0.168 kg is the mass of the pendulum

g = 9.8 m/s^2 is the acceleration due to gravity

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So, the work done by gravity is

$W=(0.168 kg)(9.8 m/s^2)(0.211 m)=0.347 J$

And the sign is positive, since the force of gravity (downward) is in the same direction as the vertical displacement of the mass.

(c) Zero

The work done by a force is:

$W=Fd cos \theta$

where

F is the magnitude of the force

d is the displacement

$\theta$ is the angle between the direction of the force and the displacement

In this situation, the tension in the string always points in a radial direction (towards the pivot of the pendulum), while the displacement of the mass is tangential (it follows a circular trajectory): this means that the tension and the displacement are always perpendicular to each other, so in the formula

$\theta=90^{\circ}, cos \theta = 0$

and so the work done is zero.

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