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3 years ago

Which has more momentum: a 30 kg bicycle moving at 10 m/s or a 300 kg car at rest?

Physics

1 answer:

Hatshy [7]3 years ago

5 0

<h2>Answer:</h2>

Momentum = mass × velocity

Momentum of bicycle = 30 × 10 = 300 kgms¯¹

Momentum of car = 300 × 0 = 0 kgms¯¹

<h3>Therefore, 300 > 0 so momentum of bicycle is more. Hence, option A is correct. </h3>

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Consider a 2.54-cm-diameter power line for which the potential difference from the ground, 19.6 m below, to the power line is 11

tiny-mole [99]

Answer:

The line charge density is $1.59\times10^{-4}\ C/m$

Explanation:

Given that,

Diameter = 2.54 cm

Distance = 19.6 m

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Using formula of potential difference

$V=EA$

$V=\dfrac{\lambda}{2\pi\epsilon_{0}r}\times\pi r^2$

$\lambda=\dfrac{V\times2\epsilon_{0}}{r}$

Where, r = radius

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Put the value into the formula

$\lambda=\dfrac{115\times10^{3}\times2\times8.8\times10^{-12}}{1.27\times10^{-2}}$

$\lambda=1.59\times10^{-4}\ C/m$

Hence, The line charge density is $1.59\times10^{-4}\ C/m$

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