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Jlenok [28]
2 years ago
15

You observe that a negatively charged plastic pen repels a charged piece of magic tape. You then observe that the same piece of

tape is repelled when brought near a small metal sphere. You are wearing rubber soled shoes, and you touch the metal sphere with your hand. After you touch the metal sphere, you observe that the tape is attracted to the metal sphere. Which of the following statements could be true. List all that apply. (1) Electrons from the sphere moved into the salt water on your skin, where they reacted with sodium ions. (2) The excess negative charge from the sphere spread out all over your body. (3) Chloride ions from the salt water on your hand moved onto the sphere. (4) Sodium ions from the salt water on your hand moved onto the sphere. (5) Electrons from your hand moved onto the sphere. (6) Electrons from the sphere traveled through your body into the Earth. (7) After you touched it, the metal sphere was very nearly neutral.
Physics
1 answer:
hichkok12 [17]2 years ago
5 0

Answer:

(2) The excess negative charge from the sphere spread out all over your body.

(7) After you touched it, the metal sphere was very nearly neutral.

Explanation:

Plastic pen repels magic tape so magic tape is also  negatively charged . Further , magic tape repels small metal sphere that means small sphere also is negatively charged.

Now when small sphere is touched by a man insulated from ground , the charge is distributed between man and small sphere according to their capacitance .

Since human body will have greater capacitance ,it will acquire larger share of charge . Sphere being of very small size will retain very less charge and it will become almost neutral . Hence it will be   attracted by  charged tape .

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taurus [48]
In order to answer this question ... strange as it may seem ...
we only need one of those measurements that you gave us
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The door is hanging on frictionless hinges, and there's a torque
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an equal torque in the opposite direction, and the door doesn't move.

Obviously, in order for our force to have the most effect, we want
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We need to come up with 4.9 N-m of torque,
applied against the mechanical door-closer.

Torque is (force) x (distance from the hinge).

                                    4.9 N-m  =  (force) x (0.89 m) 

Divide each side by 0.89m:    Force = (4.9 N-m) / (0.89 m)

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7 0
2 years ago
Object A with a mass of 500 kilograms hits stationary object B with a mass of 920 kilograms. If the collision is elastic, what h
Vika [28.1K]
In elastic collision, both the kinetic energy and momentum are conserved. Conservation means that both the kinetic energy and momentum will have the same values before and after elastic collision.

<span>As the object A has low mass than object B. Hence upon collision, object B moves forward, while object A will move backward. So option "C" is correct. </span>

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You are working on a laboratory device that includes a small sphere with a large electric charge Q. Because of this charged sphe
madam [21]

Answer:

the only effect it has is to create more induced charge at the closest points, but the net face remains zero, so it has no effect on the flow.

Explanation:

We can answer this exercise using Gauss's law

      Ф = ∫ e . dA = q_{int} / ε₀

field flow is directly proportionate to the charge found inside it, therefore if we place a Gaussian surface outside the plastic spherical shell.  the flow must be zero since the charge of the sphere is equal  induced in the shell, for which the net charge is zero. we see with this analysis that this shell meets the requirement to block the elective field

From the same Gaussian law it follows that if the sphere is not in the center, the only effect it has is to create more induced charge at the closest points, but the net face remains zero, so it has no effect on the flow , so no matter where the sphere is, the total induced charge is always equal to the charge on the sphere.

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