The pressure generated by the piston at the input cylinder must be:
p = F / A = 250 lb-f / 30 in^2
The pressure generated by the piston at the output cylinders is p = F / A = 775 lb-f / A.
Pascal principle rules that both pressures are equal, so:
250 lb-f / 30 in^2 = 775 lb-f / A => A = 775 lb-f * 30 in^2 / 250 lb-f = 93 in^2
Gvien that each output cylinder are 30in^2 you need 93 / 30 = 3.1 cylinders.
Which means that at least you need 4 cylinders to generate a force at least of 775 lb-f.
Answer: 4
Explanation:
It is known that like charges tend to repel each other whereas unlike charges tend to attract each other. This means that two positive charges when come closer to each other will repel each other and if a negative charge comes in contact with a positive charge then both of them will attract each other.
Therefore, when you charge a pocket comb by rubbing it with a silk scarf then the scarf will obtain a certain charge. But as we place this silk scarf closer to the comb then if the scarf gets attracted towards the comb then it means opposite charges are present on both comb and the scarf.
But if the scarf and comb repel each other then it means opposite charges are present on them.
Any vector can be written as components along positive X and positive Y axes.
So vector A can be written as , where is the angle between vector A and positive X axis
So vector A =
So components of vector B along X -axis =5 cm
along Y-axis = 8.667 cm
Speed= 10/5 which is 2m/s
Acceleration= 2/5 which is 0.4m/s2
Force=tension-fg sin ∅
=140-mg sin 18.5
=140-124.35
=15.62N
a=f/m=15.62/40=0.39
now,
v²=u²+2as
=2×0.39×80
v²=62.4
v=7.8m/s