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kenny6666 [7]
3 years ago
5

GIVING EASY BRAINLIEST PLEASE HELP!!

Physics
1 answer:
MatroZZZ [7]3 years ago
3 0

Answer:

A

Explanation:

because the first law of thermodynamics is heat brings energy, but don't get confused with C, because bicyle pumps is the thing itself getting warm, though its not providing any energy unlike the stove, which uses it energy to heat something.

hope this helps :)

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Calculate the force, when a object acelerattes to 30 m/s^2 and have a mass of 40 kg
faust18 [17]

Hello!

Use the <u>second law of Newton:</u>

F = ma

Replacing:

F = 40 kg * 30 m/s^2

Resolving:

F = 1200 N

The force is <u>1200 Newtons.</u>

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A charge Q is transferred from an initially uncharged plastic ball to an identical ball 24 cm away.The force of attraction is th
xxMikexx [17]

Answer:

The number of electrons transferred from one ball to the other is 2.06 x 10¹² electrons

Explanation:

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distance between the two objects, r = 24 cm = 0.24 m

The attractive force is given by Coulomb's law;

F = \frac{1}{4\pi \epsilon _0} \times \frac{Q^2}{r^2} = \frac{kQ^2}{r^2} \\\\Q^2 = \frac{Fr^2}{k} \\\\Q = \sqrt{ \frac{Fr^2}{k}} \\\\Q = \sqrt{ \frac{(0.017)(0.24)^2}{9\times 10^9}} \\\\Q = 3.298 \times 10^{-7} \ C

The charge of 1 electron = 1.602 x 10⁻¹⁹ C

n(1.602 x 10⁻¹⁹ C) = 3.298 x 10⁻⁷

n = \frac{3.298 \times 10^{-7}}{1.602 \times 10^{-19}} = 2.06 \times 10^{12} \ electrons

Therefore, the number of electrons transferred from one ball to the other is 2.06 x 10¹² electrons

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3 years ago
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