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4 years ago

Which best describes the materials that make up an electrical cord?

2 answers:

6 0

the answer to the question is a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons

ser-zykov [4K]4 years ago

4 0

<h2>Answer:</h2>

<u>The material should be conductor insulated by insulator</u>

<h2>Explanation:</h2>

An electrical cord is an electrical cable that temporarily connects an appliance to the mains electricity supply via a wall socket or extension cord. The most frequently used material for the conductor in an electrical cable is copper because it is the best conductor for the flow of electric current as it is abundant in free electrons. After that an insulator like rubber or plastic is placed between the two electrodes and then connected to an electrical socket.

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Which of these circuit schematics has an ammeter?<br> Α. Α<br> B. B<br> C. C<br> D. D

madam [21]

Answer:

d is the correct answer for this question hope it helps

Explanation:

when you see a A in a circle the the ammeter

3 0

4 years ago

Read 2 more answers

A 0.500 kg ball is dropped from rest at a point 1.20 m above the floor. The ball rebounds straight upward to a height of 0.700 m

KatRina [158]

To solve this problem we will apply the concepts related to energy conservation. With this we will find the speed before the impact. Through the kinematic equations of linear motion we will find the velocity after the impact.

Since the momentum is given as the product between mass and velocity difference, we will proceed with the velocities found to calculate it.

Part A) Conservation of the energy

$mgh = \frac{1}{2} mv^2$

$v_1 = \sqrt{2gh}$

$v_1 = \sqrt{2(9.8)(1.20)}$

$v_1 = 4.84m/s$

$\therefore v_1 = -4.84/s \rightarrow \text{Negative direction downward}$

Part B) Kinematic equation of linear motion,

$v_2^2 = u_0^2 +2a\Delta y$

Here

v= 0 Because at 1.5m reaches highest point, so v=0

$0 = u_2^2 +2(-9.8)(0.7)$

$u_2 = 3.7m/s$

Therefore the velocity after the collision with the floor is 3.7m/s

PART C) Total change of impulse is given as,

$J = P_2 -P_1$

$J = mU_2-mV_1$

$J = m(U_2-V_1)$

$J = (0.5)(3.7-(-4.84))$

$J = 4.27kg \cdot m/s \rightarrow \text{Upward because is positive}$

6 0

4 years ago

Polarized light passes through a polarizer. If the electric vector of the polarized light is horizontal what, in terms of the in

Nina [5.8K]

Answer:

The intensity of the light that passes through a polarizer is 0.55I₀.

Explanation:

The intensity of the light that passes through a polarizer can be found using Malus's law:

$I = I_{0}cos^{2}(\theta)$

<u>Where</u>:

I: is the intensity of the light that passes through a polarizer

I₀: is the initial intensity

θ: is the angle between the light's initial polarization direction and the axis of the polarizer = 42°

$I = I_{0}cos^{2}(\theta) = I_{0}cos^{2}(42) = 0.55*I_{0}$

Therefore, the intensity of the light that passes through a polarizer is 0.55I₀.

I hope it helps you!

5 0

3 years ago

Which electromagnetic waves have the shortest wavelength and the highest frequency?

ra1l [238]

It’s supposed to be gamma, what are your other options

5 0

3 years ago

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is th

Thepotemich [5.8K]

Answer:

a. x=5355m b. food

Explanation:

A wave is a disturbance wic travels through a medium, it transfers energy without the displacement of the medium itself.

the problem can be solved with this formula v

v=2x/t

v=speed of the ultrasonic wave in seawater

x=te distance between the seawater surface and the seawater bed

t=time it takes to travel to and fro te seawater bed to the surface

v= 1530 m/s, t=7 s , x=?

1530=2x/7

1530*7=2x

x=5355m

b. An example of stored h energy is food, petroleum etc.Chemical energy are Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; called exothermic.

Reactions that require an input of heat to proceed may store some of that energy as chemical energy in newly formed bonds. we eat food so that we can h enough energy to carry out our day to day task.

3 0

3 years ago