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user100 [1]
3 years ago
12

You rub a clear plastic pen with wool, and observe that a strip of invisible tape is attacted to the pen. Assuming that the pen

has a negative charge, which of the following could be true? Select all that apply. :A.The tape might be negatively charged.B.The tape might be positively charged.C.The tape might be uncharged.D.There is not enough information to conclude anything.
Physics
1 answer:
melomori [17]3 years ago
3 0

Explanation:

It is known that opposite charges tend to attract each other whereas like charges tend to repel each other.

For example, when we rub a plastic pen with wool and it gets attracted towards an invisible tape then it means that there is an opposite charge present on both the objects.

A neutral object also tends to develop a charge when it comes in contact with a charged object.

Thus, we can conclude that the following statements are true.

  • The tape might be positively charged.
  • The tape might be uncharged.
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s_i is the final position of the car which is zero meters (i.e the ground)

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Explanation:

Generally from third equation of motion we have that

v^2 =  u^2 + 2a[s_i - s_f]

Here v is the final speed of the car

u is the initial speed of the car which is zero

s_i is the initial position of the car which is certain height H

s_i is the final position of the car which is zero meters (i.e the ground)

a is the acceleration due to gravity which is g

So

v^2 = 0 + 2g[H - 0]

=> v  =  \sqrt{ 2 g H}

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13.9  =  \sqrt{ 2 g H}

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