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r-ruslan [8.4K]
3 years ago
6

A pendulum has 951 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o

f its swing?
Physics
1 answer:
denis23 [38]3 years ago
7 0

Energy is conserved ... it can't be created or destroyed, and the total amount is constant.

If the pendulum doesn't encounter anything that robs energy from it ... friction in the pivot, air resistance, etc. ... then its kinetic energy at the bottom is EQUAL to its potential energy at the top.

<em>951 J</em>

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A uniform rod is set up so that it can rotate about a perpendicular axis at one of its ends. The length and mass of the rod are
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Answer:

0.231 N

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To get from rest to angular speed of 6.37 rad/s within 9.87s, the angular acceleration of the rod must be

\alpha = \frac{\theta}{t} = \frac{6.37}{9.87} = 0.6454 rad/s^2

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I = \frac{mL^2}{3} = \frac{1.27*0.847^2}{3} = 0.303kgm^2

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4 0
3 years ago
Samantha is refinishing her rusty wheelbarrow. She moves her sandpaper back and forth 45 times over a rusty area, each time movi
Leviafan [203]

Answer:

W = 12.96 J

Explanation:

The force acting in the direction of motion of the sand paper is the frictional force. So, we first calculate the frictional force:

F = μR

where,

F = Friction Force = ?

μ = 0.92

R = Normal Force = 2.6 N

Therefore,

F = (0.92)(2.6 N)

F = 2.4 N

Now, the displacement is given as:

d = (0.12 m)(45)

d = 5.4 m

So, the work done will be:

W = F d

W = (2.4 N)(5.4 m)

<u>W = 12.96 J</u>

5 0
3 years ago
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