jaymoney0531

21.01.2021 • 

Physics

totally reflecting disk has radius 8.00 mm and average density 600 kg>m3. A laser has an average power output Pav spread uniformly over a cylindrical beam of radius 2.00 mm. When the laser beam shines upward on the disk in a direction perpendicular to its flat surface, the radiation pressure produces a force equal to the weight of the disk. (a) What value of Pav is required

Ответ:

8236

17.10.2022

Physics

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90 J

Explanation:

Change in potential energy when the spring is stretched

ΔU = ∫[(F) dx] Equation 1

Where F = 40x-6x²

Substitute into equation 1

ΔU = ∫[40x-6x²]

ΔU = [40x²/2 + 6x³/3 +C]

ΔU = [20x²+2x³ +C]

If the spring is stretch from x = 0m to x = 2m

ΔU = [20×2²+2×2³+C]-[20×0²+2×0³+C]

ΔU = [80+16+C]-[C]

ΔU = 90 J.

Hence the change in potential energy of the spring = 90 J

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