Physics, 19.01.2020 08:31 erikloza12pdidtx

When people use plastic combs on their hair, the combs become negatively charged. which statements about this situation are true?

the comb loses electrons.
the comb gains electrons.
the hair loses electrons.
the hair gains protons.
the hair loses protons.

those above are the choices

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Answer from: slpsoniaa

The correct answer is "The comb gains electrons".

Explanation:

A static charge is induced by rubbing the two surfaces of the material. These materials are not a good conductor of electricity.

The electrons are transferred from one material to the other.

A static charge is induced on a material when the material loses electrons due to friction.

The material which acquires the electrons will get negatively charged.

While combing the hairs by using a comb the combs become negatively charged. Here, the electrons are transferred from hair to the comb. Therefore, the comb will gain electrons and it will get negatively charged.

Therefore, "the comb gains electrons" is true.

Answer from: swaggg2084

If the comb has become negatively charged, it must have gained electrons.

Answer from: Quest

answer: the correct answer id option(d).

explanation:

snell's law refraction:

$\frac{n_2}{n_1}=\frac{sin \theta_1}{sin\theta_2}$

the angle of refraction = $\theta_2=38 ^o$

the angle of incidence = $\theta_1=?$

refractive index of air = $n_1$ = 1

refractive index of glycerol $n_2$ = 1.47

$\frac{1.47}{1}=\frac{sin\theta_1}{sin 38^o}, (sin38^o=0.61)$

$sin\theta_2=0.8967$

$\theta_2=24.2^o, (sin^{-1}0.8967=63.72^o)$

from the given options, the most closest answer to 63.72° is 65° of option (d).

Answer from: Quest

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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