Which statement bet explains the relationship between the electric force between two charged objects and the distance between th
1 answer:
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Actually the question is not clear. The Benefit of lifting using lever is that you can apply force in a convenient direction and you can use very less force to lift object by balancing the torque due to object.For example you want to lift a mass of 4N with a force 2N you can use a class 2 lever and maintain the ratio between the distances of the body and the point of application of force from the fulcrum to be 1:2.In any case balance the torque to get the required force.
Answer:
Explanation:
First of all, let's convert from nanometres to metres, keeping in mind that
So we have:
Now we can convert from metres to centimetres, keeping in mind that
So, we find:
Answer:
K' = 1200 J
Explanation:
To find the kinetic energy you first take into account the formula for the kinetic energy of the charge:
= 800J (1)
m: mass of the charge
v: final speed of the charge when it reaches the positively charged plate.
Furthermore, you have that the acceleration of the charge is obtained by using the second Newton law:
(2)
a: acceleration
E: electric field
q: charge
The electric field between two parallel plates is V/d, being V the potential difference and d the separation between plates. You replace E in (2) and obtain:
Next, you take into account the following formula for the calculation of the final speed of the charge:
Next, you replace this value of v in (1):
= 880J (3)
If the distance between plates is tripled, and the potential difference is halved, you have for the new final speed:
And the kinetic energy becomes:
(4)
You calculate the ratio between both kinetic energies K and K', that is, you divide equations (3) and (4), in order to find the new kinetic energy:
hence, the kinetic energy of the charge incresases to 1200J