1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a ?
A
$${{2ma} \over {g + a}}$$
B
$${{2ma} \over {g - a}}$$
C
$${{ma} \over {g + a}}$$
D
$${{ma} \over {g - a}}$$
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A system consists of three masses m1, m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction = $$\mu $$). The pulley is frictionless and of negligible mass. The downward acceleration of mass m1 is (Assume m1 = m2 = m3 = m)

AIPMT 2014 Physics - Laws of Motion Question 19 English
A
$${{g\left( {1 - g\mu } \right)} \over 9}$$
B
$${{2g\mu } \over 3}$$
C
$${{g\left( {1 - 2\mu } \right)} \over 3}$$
D
$${{g\left( {1 - 2\mu } \right)} \over 2}$$
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
The force F acting on a particle of mass m is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8 s is :

AIPMT 2014 Physics - Center of Mass and Collision Question 31 English
A
24 N s
B
20 N s
C
12 N s
D
6 N s
4
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three pieces. Two pieces, each of mass (m) move perpendicular to each other with equal speeds (v). The total kinetic energy generated due to explosion is :
A
mv2
B
$${3 \over 2}$$mv2
C
2mv2
D
4mv2
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