Physics, 26.12.2019 19:31 mahadharun

How many proton must compound have if it had 50 electrons and a net charge of 9.6*10^-18c

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Answer from: lakiyalundy57

110

Explanation:

The net charge of the compound is the sum of the net charges due to the electrons and the protons:

Q=N_p q_p + N_e q_e

where

Np is the number of protons

Ne = 50 is the number of electrons

$N_p = +1.6\cdot 10^{-19} C$ is the charge of each proton

$N_e = -1.6\cdot 10^{-19} C$ is the charge of each electron

$Q=+9.6\cdot 10^{-18} C$ is the net charge of the compound

Solving the equation for Np, we find the number of protons:

$N_p = \frac{Q-N_e q_e}{q_p}=\frac{+9.6\cdot 10^{-18}C-(50)(-1.6\cdot 10^{-19}C)}{+1.6\cdot 10^{-19} C}=110$

Answer from: Quest

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Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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