A person carries a plank of wood 2 m long with one hand pushing down on it at one end with a force F1 and the other hand holding
it up at 50 cm from the end of the plank with force F2 . If the plank has a mass of 20 kg and its center of gravity is at the middle of the plank, what are the magnitudes of the forces F1 and F2 ?
1 answer:
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<u>The question does not provide enough information to complete the answer, so I'll assume the needed data to help you to solve your own problem</u>
Answer:
<em>The fly should need to move at 9,534.6 m/s to have the same kinetic energy as the automobile</em>
Explanation:
<u>Kinetic Energy </u>
Is the capacity of a body to do work due to its speed and is computed by
We are not given enough data to compare the kinetic energy of the fly with that of the automobile. We'll assume the following characteristics:
So its kinetic energy is
The mass of the fly is
To have the same kinetic as the automobile:
Solving for
The fly should need to move at 9,534.6 m/s to have the same kinetic energy as the automobile
The magnitude of the average friction force exerted on the collar (F)= 8.641 N
<h3>How can we calculate the magnitude of the average friction force exerted on the collar?</h3>To calculate the magnitude of the average friction force exerted on the collar we are using the formula,
Here we are given,
k = The spring has a spring constant.
= 25.5 N/m.
= Final length of the spring .
=
= 1.591 m
= The initial length of the spring.
= 1.25−0.60
=0.65 m
y=The collar then travels downward a distance.
= 1.80 m.
m= The mass of the collar.
=3.55 kg
= the velocity of the collar.
= 3.39 m/s.
g = The acceleration due to gravity.
= 9.81 m/s²
We have to calculate the magnitude of the average friction force exerted on the collar = F
Now we put the known values in the above equation, we get;
Or,
Or, F= 8.641 N
From the above calculation we can conclude that,
The magnitude of the average friction force exerted on the collar (F)= 8.641 N
Learn more about friction:
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Disclaimer: This question is incomplete in the portal. Here is the complete question.
Question:
The 3.55 kg collar shown below is attached to a spring and released from rest at A. The collar then travels downward a distance of y = 1.80 m. The spring has a spring constant of k = 25.5 N/m. The distance a is given as 1.25 m. The datum for gravitational potential energy is set at the horizontal line through A and B. Determine the magnitude of the average friction force exerted on the collar when the velocity of the collar at c is 3.39 m/s and the spring has an unstretched length of 0.60 m .
