Physics, 03.08.2019 09:00 xx3

Your body has billions of billions of electrons and protons in it. why don’t we all repel or stick to each other?

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Answer from: hdjehd

We do not feel the gravitational forces between ourselves and the objects around us because these forces are extremely small. Electrical forces, in comparison, are huge. Since we and the objects around us are composed of charged particles, why don't we usually feel electrical forces?
The charged particles of which we are composed are balanced: each positive charge is balanced by a negative charge, so that overall we are electrically neutral. Any imbalance in electrical charge is quickly rectified by picking up charge from something else; that's the reason that we get little shocks in dry weather or in the winter.When combing your hair, you scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb?
The hair loses (negatively-charged) electrons; the comb gains them. Therefore your hair becomes positively charged and the comb becomes negatively charged.Hope this help,tried to give an example and some questions so u can understand it a little more.

Answer from: Quest

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

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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Your body has billions of billions of electrons and protons in it. why don’t we all repel or stick t...