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vlabodo [156]
3 years ago
6

If μs is greater than some critical value, the woman cannot start the crate moving no matter how hard she pushes. calculate this

critical value of μs.
Physics
1 answer:
fiasKO [112]3 years ago
4 0

weight = mg acts downwards <span>
normal force = N acts upwards. 
and force F acts at an angle θ below the horizontal. 
(Let us assume that the woman pushes from the left, so F is acted towards the right, which is below the horizontal) 
so that, Frictional force, f=us*N acts towards the left 

Now we balance the forces along x and y directions: 
y direction: N = mg + F sinΘ 
x direction: us * N = F cosΘ 

We let the value of µs be equal to a value such that any F will not be able to move the crate. Then, if we increase F by an amount F', then the force pushing the crate towards the right also increases by F' cosΘ. Additionally, the frictional force f must raise by exactly this amount. 
Since f can’t exceed us*N, so the normal force must increase by F' cosΘ/us. 
Also, from the y direction equation, the normal force exceeds by F' sin Θ. 

<span>These two values must be the same, therefore:
<span>us = cot θ</span></span></span>

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<h3> What is the first law of thermodyanamics?</h3>

"First law of thermodynamics" states that "energy" neither created nor destroyed, but it can transfer from "one form of energy" to "another form of energy".

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3 0
2 years ago
When the switch in the drawing is closed, the current in the coil increases to its equilibrium value. While the current is incre
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Answer:

The correct choice is 8o.

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6 0
2 years ago
Which kind of cycle is the rock cycle-one with a set path or one with many possible paths? Construct an explanation that describ
hjlf

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Every rock is somewhere in the rock cycle. The story of the rock is the story of rock cycle: where the rock is now on the rock cycle, the path it took on the rock cycle to get to where it is now, and the path on the rock

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This is the answer i put it and it worked if it didn't work for you that's because you lesson or teacher was doing it in a different way.

8 0
3 years ago
Read 2 more answers
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