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Standard XII
Physics
Static Friction
A window scru...
Question
A window scrubber is used to brush up a vertical window as shown in figure.The brush weight 12 N and coefficient of friction of 0.15. Calculate minimumvalue of F required to scrub the window.(A)(B)15 N10.2 N53(D)18.1 N(C)16.9 N33
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Q.
A window scrubber is used to brush up a vertical window as shown in figure. The brush weigh
12
N
and coefficient of kinetic friction of
0.15
. Calculate
F
:
Q.
A slightly loosely fit window is balanced by two strings which are connected to weights
w
/
2
each. The strings pass over the frictionless pulleys as shown in the figure. The strings are tied almost at the corner of the window. The string on the right is cut and then the window accelerates downwards. If the coefficients of friction between the window and the side supports is
μ
then the acceleration of the window in terms of
μ
,a,b and g is
[
b
−
μ
a
x
b
+
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a
]
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is width and
b
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Q.
A solid blcok 'A' weighting 'Q' kg is resting on a flat floor. A smooth cylindder 'B' weighting 'P' kg is placed between the solid A and the vertical wall as shown in figure. The friction between the cylinder, wall and the block A is negligible. The coefficient of friction between the block A and floor is
μ
. The minimum weight P required to disturb the block A is
Q.
What is the magnitude of minimum force
F
necessary to push the block up against a wall, as shown in the figure. The coefficient of friction between the block and the wall is
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Q.
A window washer pulls a rubber squeegee down a very tall vertical window. The squeegee has mass
160
g
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0.900
. The window washer presses it against the window with a force having a horizontal component of
4.00
N
. (a) If she pulls the squeegee down the window at constant velocity, what vertical force component must she exert? (b) The window washer increases the downward force component by
25.0
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