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Answer:
<h2>9,226,250 J</h2>
Explanation:
The kinetic energy of an object can be found by using the formula

v is the velocity
m is the mass
From the question we have

We have the final answer as
<h3>9,226,250 J</h3>
Hope this helps you
Answer:
Explanation:
We shall apply here Doppler's effect in optics . The formula is as follows

Δλ is change in wavelength , λ is original wavelength , v is velocity and c is velocity of light
Δλ = 685 - 590 = 95 nm
λ = 685
95 / 685 = v / 3 x 10⁸
v = .416 x 10⁸ m / s
= 4.16 x 10⁷ m /s
Torque = r x F
|F| = mg = 60 * 10 N = 600 N ( assuming g ~ 10m/s^2)
distance of fulcrum = torque / Force = 90/600 m = .15 m.