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aleksandr82 [10.1K]
3 years ago
10

A wire is stretched to double its length .what happened to its resistance and resistivity?​

Physics
1 answer:
sukhopar [10]3 years ago
3 0
Resistivity of wire remains constant. As the length of wire gets doubled, the cross-sectional area will become half of its previous value because volume of wire remains constant. Hence, we can see that the new resistance is four times the previous resistance.
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A ball is thrown so that its initial vertical and horizontal components of velocity are 30 m/s and 15 m/s, respectively. Estimat
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Answer:

H = 45 m

Explanation:

First we find the launch velocity of the ball by using the following formula:

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where,

v₀ = launching velocity = ?

v₀ₓ = Horizontal Component of Launch Velocity = 15 m/s

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Therefore,

v₀ = √[(15 m/s)² + (30 m/s)²]

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Now, we find the launch angle of the ball by using the following formula:

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θ = tan⁻¹ (30/15)

θ = tan⁻¹ (2)

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Now, the maximum height attained by the ball is given by the formula:

H = (v₀² Sin² θ)/2g

H = (33.54 m/s)² (Sin² 63.43°)/2(10 m/s²)

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