1
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 $${1 \over {{t}}}$$
2
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A rocket is fired vertically from the earth with an acceleration of 2g, where g is the gravitational acceleration. On an inclined plane inside the rocket, making an angle $$\theta $$ with the horizontal, a point object of mass m is kept. The minimum coefficient of friction $$\mu $$min between the mass and the inclined surface such that the mass does not move is :
A
tan$$\theta $$
B
2tan$$\theta $$
C
3tan$$\theta $$
D
tan2$$\theta $$
3
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
JEE Main 2015 (Offline) Physics - Laws of Motion Question 96 English
Given in the figure are two blocks $$A$$ and $$B$$ of weight 20 N and 100 N, respectively. These are being pressed against a wall by a force $$F$$ as shown. If the coefficient of friction between the blocks is 0.1 and between block $$B$$ and the wall is 0.15, the frictional force applied by the wall on block $$B$$ is :
A
$$120$$ $$N$$
B
$$150$$ $$N$$
C
$$100$$ $$N$$
D
$$80$$ $$N$$
4
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
A block of mass $$m$$ is placed on a surface with a vertical cross section given by $$y = {{{x^3}} \over 6}.$$ If the coefficient of friction is $$0.5,$$ the maximum height above the ground at which the block can be placed without slipping is:
A
$${1 \over 6}m$$
B
$${2 \over 3}m$$
C
$${1 \over 3}m$$
D
$${1 \over 2}m$$
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