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3 years ago

Will increasing length and cross-sectional area increase the resistance of an object?

Physics

1 answer:

Klio2033 [76]3 years ago

5 0

Answer:

Increasing length increases resistance

increasing cross sectional area reduces the resistance

Explanation:

The formula for resistance of an object is

$r = d \frac{l}{a}$

where r is resistance, d is resistivity of the material, l is length of material and a is cross sectional area of the object. This equation shows us that resistance is directly proportional to length and inversely proportional to cross sectional area. Hence, increasing length increases resistance while increasing cross sectional area reduces the resistance.

If these 2 variables are varied to the same extent, the net effect can be zero on the resistance.

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3 years ago

Give 1 real life example of a scenario that takes advantage of the inverse relationship between force and time when impulse is c

OverLord2011 [107]

Answer:

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When however, the lawn tennis player moves the racket faster, with the strings of the racket highly tensioned he uses more force and the ball also spends less time on the racket to produce the same momentum

Explanation:

The impulse of a force, ΔP is given by the following formula;

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3 years ago

(b) A car of mass 3000 kg travels at a constant velocity of 5.0 m/s.

Tamiku [17]

Answer:

16.7 s

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T= <u>Vf - Vo</u> a= <u>F</u>

a m

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3 years ago