2 years ago

Visible light waves are ______ waves A.mechanical B.electromagnetic

Physics

1 answer:

motikmotik2 years ago

4 0

B.Electromagnetic
explanation:

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Explanation:

Mechanical Advantage is given as a ratio of the force a machines gives out to the force that it receives.

Simply put, it is the ratio of output force to input force:

$MA = \frac{OF}{IF}$

We are given that:

OF = 60 N

IF = 15 N

Hence, the Mechanical Advantage of the lever is:

$MA = \frac{60}{15} \\\\\\MA = 4$

It is a ratio so it has no unit.

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A ball is batted straight up into the air and reaches a maxium height 65.6 m (a) How long did it take to reach this height? (b)

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Answer:

a) 3.65 seconds

b) 35.87 m/s

Explanation:

s = Displacement = 65.6 m

u = Initial velocity

v = Final velocity

t = Time taken

a = Acceleration due to gravity = 9.81 m/s² (downward direction is taken as positive and upward is taken as negative)

b) Equation of motion

$v^2-u^2=2as\\\Rightarrow 0^2-u^2=2\times -9.81\times 65.6\\\Rightarrow u=\sqrt{2\times 9.81\times 65.6}\\\Rightarrow u=35.87\ m/s$

Initial pop up velocity is 35.87 m/s

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It took 3.65 seconds to reach this height

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