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Lesechka [4]
3 years ago
11

The distance between two objects is increased by three times the oringinal distance. How will this change the force of attractio

n between two objects
Physics
1 answer:
tigry1 [53]3 years ago
8 0
<span>The distance between two objects is increased by three times the oringinal distance.  Since they were already separated by one time the original distance,
the additional three times the oringinal distance now puts them four times the original distance apart.

Whether we're talking about the gravitational forces of attraction or
the electrical forces of attraction, either one is inversely proportional
to the square of the distance between the objects. 

So changing the distance to four times the original distance causes
the forces to become 1/4</span>² as strong as they were originally. 

The forces become 1/16 of their original magnitude.<span>
 </span>
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In the given question, current would be induced in the wire only when the magnet moves. That is either when the magnet is pushed into a wire, or when pulled out. But no current would flow through the wire when the magnet is left there for a while.

The current is induced because of the motion involved. Thus, the appropriate option is C.

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A rock with a mass of 540 g in air is found to have an apparent mass of 342 g when submerged in water. (a) What mass of water is
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So the resultant force, which is the apparent weight of the rock (W'), is

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where m' is the apparent mass of the rock. Using:

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m' = 342 g

we find the mass of water displaced

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(b) 1.98\cdot 10^{-4} m^3

If the rock is completely submerged, the volume of the rock corresponds to the volume of water  displaced.

The volume of water displaced is given by

V_w = \frac{m_w}{\rho_w}

where

m_w = 198 g = 0.198 kg is the mass of the water displaced

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Substituting,

V_w = \frac{0.198}{1000}=1.98\cdot 10^{-4} m^3

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