1
JEE Main 2018 (Offline)
MCQ (Single Correct Answer)
+4
-1
Two masses m1 = 5 kg and m2 = 10 kg, connected by an inextensible string over a frictionless pulley, are moving as shown in the figure. The coefficient of friction of horizontal surface is 0.15. The minimum weight m that should be put on top of m2 to stop the motion is :
A
10.3 kg
B
18.3 kg
C
27.3 kg
D
43.3 kg
2
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A body of mass 2 kg slides down with an acceleration of 3 m/s2 on a rough inclined plane having a slope of $${30^o}$$. The external force required to take the same body up the plane with the same acceleration will be : (g = 10 m/s2)
A
14 N
B
20 N
C
6 N
D
4 N
3
JEE Main 2018 (Online) 15th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A given object takes n times more time to slide down a $${45^ \circ }$$ rough inclined plane as it takes to slide down a perfectly smooth $${45^ \circ }$$ incline. The coefficient of kinetic friction between the object and the incline is :
A
$${1 \over {2 - {n^2}}}$$
B
$$1 - {1 \over {{n^2}}}$$
C
$$\sqrt {1 - {1 \over {{n^2}}}}$$
D
$$\sqrt {{1 \over {1 - {n^2}}}}$$
4
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A particle of mass m is acted upon by a force F given by the empirical law F =$${R \over {{t^2}}}\,v\left( t \right).$$ If this law is to be tested experimentally by observing the motion starting from rest, the best way is to plot :
A
$$\upsilon$$(t) against t2
B
log $$\upsilon$$(t) against $${1 \over {{t^2}}}$$
C
log $$\upsilon$$(t) against t
D
log $$\upsilon$$(t) against $${1 \over {{t}}}$$
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