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GrogVix [38]
3 years ago
5

How do you determine if a charged comb is positively charged or negatively charged. Suppose it is positively charged, it will at

tract negative charge on the electroscope and the positive charges on the leaves will repel. If it is negatively charged, it will attract positive charge leaving the negative leaves to repel
Physics
1 answer:
ss7ja [257]3 years ago
5 0
Generally, whenever an object is charged via friction, such as in the case of a comb, it gathers a negative charge because the rubbing brings forth electrons. If the charge is induced using another already charged object, then the charge is positive. If it is positively charged, it will attract the negative charge and cause the leaves to repel.
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Wow !  This will take more than one step, and we'll need to be careful
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The centripetal acceleration of any object moving in a circle is

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Notice that we won't need to use the mass of the train.

We know the radius of the track.  We don't know the trains speed yet,
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Speed  =  (distance traveled) / (time to travel the distance).

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1 lap = circumference of the track = (2π) x (radius) =  2.4π  meters

10 laps =  24π  meters.

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The trains speed is  (distance) / (time)

                               =  (24π meters) / (80 seconds)

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NOW ... finally, we're ready to find the centripetal acceleration.

                                 <span> (speed)²  /  (radius)

                           =    (0.3π m/s)²  /  (1.2 meters)

                           =    (0.09π m²/s²)  /  (1.2 meters)

                           =    (0.09π  /  1.2)   m/s²

                           =          0.236  m/s²  .        (rounded)

If there's another part of the problem that wants you to find
the centripetal FORCE ...

Well,       Force = (mass) · (acceleration) .

We know the mass, and we ( I ) just figured out the acceleration,
so you'll have no trouble calculating the centripetal force.       </span>
4 0
3 years ago
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