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3 years ago

Bits of paper are attracted to an electrified comb or rod, even though they have nonet charge. How is this possible?

Physics

1 answer:

SashulF [63]3 years ago

7 0

Explanation:

An electrified comb is charged comb ( let say by running it through the hair) and when it is brought in the proximity of pieces of paper, the pieces tend to cling to it. This happens because the charged comb induces an opposite charge in the paper pieces and as opposite charges attract each other, the pieces are clinged.

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What are earths two internal sources of heat energy?

CaHeK987 [17]

the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, and the primordial heat left over from the formation of the Earth.

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3 years ago

Let the period of evolution of a planet at a distance R from a star be T. Prove that if it was at a distance of 2R from the star

CaHeK987 [17]

Explanation:

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2 years ago

A motor has an armature resistance of 3.75 Ω . Part A If it draws 9.10 A when running at full speed and connected to a 120-V lin

bulgar [2K]

Back emf is 85.9 V.

<u>Explanation:</u>

Given-

Resistance, R = 3.75Ω

Current, I = 9.1 A

Supply Voltage, V = 120 V

Back emf = ?

Assumption - There is no effects of inductance.

A motor will have a back emf that opposes the supply voltage, as the motor speeds up the back emf increases and has the effect that the difference between the supply voltage and the back emf is what causes the current to flow through the armature resistance.

So if 9.1 A flows through the resistance of 3.75Ω then by Ohms law,

The voltage across the resistance would be

v = I x R

= 9.1 x 3.75

= 34.125 volts

We know,

supply voltage = back emf + voltage across the resistance

By plugging in the values,

120 V = back emf + 34.125 V

Back emf = 120 - 34.125

= 85.9 Volts

Therefore, back emf is 85.9 V.

4 0

3 years ago

How many carbon atoms are there in 5 molecules of CHCl3?

lukranit [14]

There are 5 carbon atoms present in the Chemical formula, $CHCl_\\{3}$ .

<h3>What is a chemical formula?</h3>

A chemical formula is used to show the number and type of atoms present in a molecule, using the atomic symbols of the elements and numerical subscripts.

From the chemical formula;

We can deduce that we have the following elements and their corresponding number of atoms in one molecule of the compound;

Carbon = 1 atom

Hydrogen = 1 atom

Chlorine = 3 atoms

So, in 5 molecules of the compound;

Carbon = 1 x 5 = 5 atoms

Hydrogen = 1 x 5 = atoms

Chlorine = 3 x 5 atoms = 15 atoms

In conclusion, from the solution above, we can say that we have 5 atoms of carbon present in 5 molecules of $CHCl_3$ .

Learn more about chemical formula:brainly.com/question/26388921

#SPJ1

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1 year ago

F the voltage in a circuit is 80 volts and the resistance is 20 ohms, what is the current?

jek_recluse [69]

I = 4 A

Explanation:

From Ohm's law, the voltage is given by

V = IR

I = V/R = (80 V)/(20 ohms)

= 4 A

4 0

3 years ago