Answer:
18N
Explanation:
Mechanical Advantage of crowbar (lever), MA = Length of effort arm / Length of resistance arm
Therefore, MA = 28 cm / 4.2 cm = 6.667
Force required to pull the nail, F = Friction force / MA
ie, F = 120 N / 6.667 = 18 N
Explanation:
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Hello,
In physics<span>, a </span>wave<span> is an oscillation accompanied by a transfer of energy. Frequency refers to the rate of the wave, per say.
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A wave with low amplitude has a long wavelength; <span>a low energy </span><span>wave. In addition, a </span>wave with a high amplitude has a short wavelength; high<span> energy </span>wave.
Faith xoxo
Hope this helps
Ps- U can pick between these two pictures
Please mark as brainliest
Explanation:
A person standing still for a long time feels tired because the force of gravity acts on our body and puts stress on our muscles. so our muscles need energy to do work and keep body balanced and help to stand upright.