You are raising up a big bucket of water from a 25.9 m deep well. The combined mass of the water and the bucket is 13.9 kg. The
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Answer:
J = 357.5 kg*m/s
Explanation:
- The impulse exerted on Katelyn when she was on the force plate, is equal to the change in her momentum, according to Newton's 2nd Law.
- Assuming as the positive direction the upward direction (coincident with the positive y-axis) we can express the initial momentum as follows:
- By the same token, the final momentum is as follows:
- As we have already said, the impulse J is just equal to the change in momentum, i.e., the difference between (2) and (1):
Answer:
0.285
Explanation:
Given two forces of different magnitude, it is important to note that the product of normal force and coefficient of kinetic friction should be equal to the sum of these two forces at equilibrium. Therefore, this can be Mathematically expressed as:
where N is normal force, is coefficient of static friction, F is force and subscripts 1 and 2 represent larger and smaller magnitude forces respectively. Making
the subject of the formula then
Since normal force N is also given by mg where m is mass of object and g is acceleration due to gravity then substituting N with mg we obtain that
and substituting the figures given in the question, taking g as 9.81 we obtain that
Hence,the coefficient of kinetic energy is 0.285 as calculated