3 years ago

A 75.0 kg ball is rolling at a speed of 57.0 m/s. Calculate the ball’s momentum.

Physics

1 answer:

Lubov Fominskaja [6]3 years ago

4 0

4275.

To find momentum you just have to multiply mass and velocity.

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A sphere is charged with electrons to -6 x 10^-6C. How many electrons make up this charge? The elemental charge is 1.6 x 10^-19

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Answer:

$3.75*10^{-13}$ electrons

Explanation:

The total charge Q is the sum of the charge of the N electrons contained in the sphere:

$Q=N*q_{e}$

$q_{e}=-1.6*10^{-19}C$ charge of a electron

We solve to find N:

$N=\frac{Q}{q_{e}}=\frac{-6 x 10^{-6}}{-1.6 x 10^{-19}}=3.75*10^{-13}$

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A projectile is launched straight upwards at 75 m/s. Three seconds later, its velocity is...?

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