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makkiz [27]
3 years ago
8

An object on the surface of the earth weighs 90 lb. At two earth radii above the surface, It will welgh:

Physics
1 answer:
vredina [299]3 years ago
4 0
I have no explanation, but saw this pop up on a test paper and the answe was 10lb
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Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.00 s, it rotates 13.9 rad. Du
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Answer:

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(b) Average angular velocity is 2.78 rad/s .

Explanation:

The equation of motion in Rotational kinematics is:

θ = θ₀ + 0.5αt²

Here θ is angular displacement at time t, θ₀ is angular displacement at time t=0, t is time and α is constant angular acceleration.

(a) According to the problem, θ is 13.9 rad, θ₀ is zero as it is at rest and t is 5 s. Put these values in the above equation:

13.9 = 0 + 0.5α(5)²

α = 1.112 rad/s²

(b) The equation of average angular velocity is:

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ω = \frac{13.9}{5}

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