1
WB JEE 2021
+1
-0.25  Three blocks are pushed with a force F across a frictionless table as shown in figure above. Let N1 be the contact force between the left two blocks and N2 be the contact force between the right two blocks. Then,
A
F > N1 > N2
B
F > N2 > N1
C
F > N1 = N2
D
F = N1 = N2
2
WB JEE 2020
+1
-0.25 A block of mass m rests on a horizontal table with a coefficient of static friction $$\mu$$. What minimum force must be applied on the block to drag it on the table?
A
$${\mu \over {\sqrt {1 + {\mu ^2}} }}$$ mg
B
$${{\mu - 1} \over {\mu + 1}}$$ mg
C
$${\mu \over {\sqrt {1 - {\mu ^2}} }}$$ mg
D
$$\mu$$ mg
3
WB JEE 2019
+1
-0.25 Two weights of the mass m1 and m2 (> m1) are joined by an inextensible string of negligible mass passing over a fixed frictionless pulley. The magnitude of the acceleration of the loads is
A
g
B
$${{{m_2} - {m_1}} \over {{m_2}}}$$
C
$${{{m_1}} \over {{m_2} + {m_1}}}g$$
D
$${{{m_2} - {m_1}} \over {{m_2} + {m_1}}}g$$
4
WB JEE 2018
+1
-0.25 A block of mass m2 is placed on a horizontal table and another block of mass m1 is placed on top of it. An increasing horizontal force F = at is exerted on the upper block but the lower block never moves as a result. If the coefficient of friction between the blocks is $$\mu$$1 and that between the lower block and the table is $$\mu$$2, then what is the maximum possible value of $$\mu$$1 / $$\mu$$2 ?
A
$${{{m_2}} \over {{m_1}}}$$
B
1 + $${{{m_2}} \over {{m_1}}}$$
C
$${{{m_1}} \over {{m_2}}}$$
D
1 + $${{{m_1}} \over {{m_2}}}$$
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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