Answer:
a) 0 N
b) 6 N
c) So the applied force must be greater than 16 newton.
Explanation:
Given:
weight of the box, ![w=40\ N](https://tex.z-dn.net/?f=w%3D40%5C%20N)
coefficient of static friction between the box and horizontal surface, ![\mu_s=0.4](https://tex.z-dn.net/?f=%5Cmu_s%3D0.4)
coefficient of kinetic friction, ![\mu_k=0.2](https://tex.z-dn.net/?f=%5Cmu_k%3D0.2)
Here the given value of coefficient of static friction is understated, it is given here as the maximum value of the coefficient of static friction which is variable according to the applied force on the body tending to promote a relative motion between the surfaces.
a)
When no horizontal force is applied on the box and the box is at rest then according to the Newton's first law of motion the box tends to have its initial state of rest and all the forces acting on the box are in equilibrium. Hence no frictional force acts on the box.
b)
When a monkey applies a force of 6 N on the box and it does not move then the contact surface friction also applies the equal amount of force in the opposite direction which balances out the applied force, this will happens upto the maximum coefficient of friction which is stated as coefficient of static friction in the question.
c)
the minimum force required to move the box must be greater than the maximum force of friction which resists the relative motion.
We have the maximum frictional force as:
![f=\mu_s.w](https://tex.z-dn.net/?f=f%3D%5Cmu_s.w)
![f=0.4\times 40](https://tex.z-dn.net/?f=f%3D0.4%5Ctimes%2040)
![f=16\ N](https://tex.z-dn.net/?f=f%3D16%5C%20N)
So the applied force must be greater than 16 newton.
Answer: 50m/s
Explanation: if you add 10 x 1 is 10 so you leave it as 10 then you do 10 x 5 which will come out as 50 so then you get the answer 50m/s
Sound is a longitudinal wave that carries energy. Sound needs a medium to propagate through (this means that sound cannot propagate in vacuum).
The medium usually determines the speed of the wave travelling through it.
As the sound waves travel in a medium, this medium begins to decrease, therefore, the energy of the sound also decreases.
I believe it’s 1 aka A part of it is reflected as Ray 2
Katie Ledecky is her name.