Physics, 05.09.2020 01:01 mandyO1

A system of 1470 particles, each of which is either an electron or a proton has a net charge of -5.456 x 10^-17 C. (a) How many electrons are in this system? (b) What is the mass of this system?

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Answer from: hopp

$N_e = 906 \ electrons$

$M = 9.43 *10^{-25} \ kg$

Explanation:

From the question we are told that

The total number of particles is n = 1470 particles

The the total amount of charge on the particles is $Q = - 5.456*10^{-17} \ C$

Generally this total number of particles can be mathematically represented as

n = N_p + N_e

Where $N_p \ and \ N_e$ represent the number of proton and electron respectively

=> N_p = 1470 - N_e

Also the total charge of these particles can be mathematically represented as

Q = (N_p - N_e ) e

Here e is the charge on a single electron or proton with value

The negative sign is due to the fact the electrons are negative signed

$e = 1.60 *10^{-19} \ C$

$-5.456*10^{-17} = ( 1470 -2N_e )* 1.60 *10^{-19}$

N_e = 906

Thus

N_p = 1470 - 906

N_p = 564

Generally the mass of the system is mathematically represented as

M = N_e * M_e + N_p * M_p

Here $M_e \ and \ M_p \ are \ mass \ of \ electron \ and \ proton \ with \ values \\ M_e = 9.1 *10^{-31} \ kg \ and \ M_p = 1.67 *10^{-27} \ kg \ respectively$

$M = 906 * 9.1 *10^{-31} + 564 * 1.67 *10^{-27}$

$M = 9.43 *10^{-25} \ kg$

Answer from: Quest

Where are the options ?

Answer from: Quest

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

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A system of 1470 particles, each of which is either an electron or a proton has a net charge of -5.4...

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