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maksim [4K]
3 years ago
14

What is the system's potential energy when its kinetic energy is equal to 34e?

Physics
1 answer:
mixer [17]3 years ago
8 0
Otal energy= PEmax on the spring = KEmax of the oject 
<span>Total Energy= KE+PE at v or x not maximum. </span>

<span>Using the second line </span>
<span>E= 3/4 E + PE </span>
<span>PE = 1/4 E </span>


<span>PEmax =E = 1/2 kA^2 </span>
<span>PE=E/4 = (1/2)kA^2 / 4= kA^2/8 
</span>
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Good morning.

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Now:

\mathsf{(2.3)^2 = 0^2 + 2a\cdot 8.9}\\ \\ \mathsf{5.29 = 17.8a}\\ \\ \bold{\mathsf{a = 0.3 \ m/s^2}}


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\mathsf{F_r = m\cdot a}\\ \\ \mathsf{F_r = 20\cdot 0.3}\\ \\ \mathsf{F_r = 6 \ N}


We have a force of 26 N → and a friction force F ←. Adding those vectors, he have  a force 6 N →. Therefore:

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\star \ \boxed{\mathsf{F = \mu_k N}}


Since we are in a horizontal plane, we hava that N = P = mg = 200 N

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\mathsf{20 = \mu_k 200}\\ \\ \boxed{\boxed{\mathsf{\mu_k = 0.1}}}
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