1
NEET 2013 (Karnataka)
+4
-1
A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 m s$$-$$1. The final velocity acquired by the person and the average force exerted on the person are :
A
$$-$$0.08 ms$$-$$1, 16 N
B
$$-$$0.8 ms$$-$$1, 8 N
C
$$-$$1.6 ms$$-$$1, 16 N
D
$$-$$1.6 ms$$-$$1, 8 N
2
NEET 2013
+4
-1
An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 m s$$-$$1 and the second part of mass 2 kg moves with 8 m s$$-$$1 speed. If the third part files off with 4 m s$$-$$1 speed, then its mass is :
A
7 kg
B
17 kg
C
3 kg
D
5 kg
3
AIPMT 2012 Mains
+4
-1
Three masses are placed on the x-axis : 300 g at origin, 500 g at x = 40 cm and 400 g at x = 70cm. The distance of the centre of mass from the orgin is :
A
40 cm
B
45 cm
C
50 cm
D
30 cm
4
AIPMT 2012 Prelims
+4
-1
Two spheres A and B of masses m1 and m2 respectively collide. A is at rest initially and B is moving with velocity v along x-axis. After collision B has a velocity $${v \over 2}$$ in a direction perpendicular to the original direction. The mass A moves after collision in the direction :
A
same as that of B
B
opposite to that of B
C
$$\theta$$ = tan$$-$$1 $$\left( {{1 \over 2}} \right)$$ to the x-axis
D
$$\theta$$ = tan$$-$$1$$\left( { - {1 \over 2}} \right)$$ to the x-axis
EXAM MAP
Medical
NEET