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Shtirlitz [24]
3 years ago
14

A wire of diameter 1 mm has a resistance of 0.5 . What is the resistance of another wire of the same material and the same leng

th but of diameter 0.5 mm?
Physics
1 answer:
victus00 [196]3 years ago
8 0

The second wire has 1/2 the <u>radius</u> of the first wire.  

Now the area of a circle is (A =π r²) ... the area changes in proportion to the SQUARE of the circle's radius.

So if you cut both wires exactly perpendicular to their lengths, and look at the circular end where the cut is, the second wire has only 1/4 the cross-section AREA of the first wire.  Current in the second wire is trying to squeeze through a pipe that only has 1/4 the space to carry it.

The resistance of a piece of wire-2 is 4 times the resistance of a piece of wire-1 with the same length.

The resistance of wire-2 is (4 x 0.5 ohm) = <em>2 ohms</em> .

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3 years ago
If an ice skater with a mass of 50 kg was accelerating at 10 m/s and is on her way to hit a
IrinaK [193]

500N

Explanation:

Given parameters:

Mass of skater = 50kg

Acceleration = 10m/s

Unknown:

Force  = ?

Solution;

Force is a push or pull on a body. it is given as the product of mass and acceleration:

               Force = mass x acceleration

    Input the parameters:

                  Force = 50 x 10 = 500N

She hits the wall with a force of 500N

Learn more:

Force brainly.com/question/3820012

#learnwithBrainly

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During a lab investigation, students added four 50 g masses to two boxes and arranged the boxes so that they were motionless on
IceJOKER [234]

When the resultant force is not equal to zero termed an unbalanced force. By procedures 4 and 5 students observe an unbalanced upward force on Box 1. Hence option 1 is right for the problem.

<h3>What is an unbalanced force?</h3>

The forces operating on a body are known as unbalanced forces when the resulting force exerted on it is not equal to zero.

Unbalanced forces acting on the body, causing it to modify its state of motion. To further grasp the nature of imbalanced forces.

<h3 />

The following reasons by which we can understand the unbalanced force caused by the box.

Due to these two reasons, books will move up.

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By removing the two masses from box 1. Due to which other become heavier other becomes heavier pulling it down causing box 1 one to go up.

Hence by procedures 4 and 5 students observe an unbalanced upward force on Box 1. Hence option 1 is right for the problem.

To learn more about the unbalanced force refer to the link;

brainly.com/question/227461

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