Olivia is on a swing at the playground at which point is her kinetic energy increasing and her potential energy decreasing
2 answers:
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The maximum frictional force in the knee joint of a person who supports 76. 0 kg of her mass on that knee 119.28N.
Given,
m=76kg, μ=0.16, g=9.81 m/
frictional force = mμg= 76*0.16*9.81= 119.28 N
<h3>Frictional force</h3>An opposing force to the relative motion of two bodies in contact is known as frictional force. Always acting in the opposite direction from the direction of motion, frictional force is applied to a moving body. Because it resists motion, it aids in lowering the moving object's speed. The force is one of touch. Four broad categories can be made for the force of friction depending on the sort of motion that occurs between the two objects. Static friction is the force of friction between an object and the surface it is put on.
What is the maximum frictional force in the knee joint of a person who supports 76. 0 kg of her mass on that knee?
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Answer:
The workdone by Jack is
The workdone by Jill is
The final velocity is
Explanation:
From the question we are given that
The mass of the boat is
The initial position of the boat is
The Final position of the boat is
The Force exerted by Jack
The Force exerted by Jill
Now to obtain the displacement made we are to subtract the final position from the initial position
Now that we have obtained the displacement we can obtain the Workdone
which is mathematically represented as
The amount of workdone by jack would be
The amount of workdone by Jill would be
According to work energy theorem the Workdone is equal to the kinetic energy of the boat
Answer:
6.25 m/s
Explanation:
Given parameters
Initial mark = 65
Final mark = 15
time taken = 8s
Unknown:
Velocity of the runner = ?
Solution:
Velocity is the displacement divided by time;
Velocity =
Displacement = Initial mark - final mark = 65 - 15 = 50m
Now, insert the parameters and solve;
Velocity = = 6.25m/s