1
JEE Main 2020 (Online) 7th January Morning Slot
+4
-1
Three point particles of masses 1.0 kg, 1.5 kg and 2.5 kg are placed at three corners of a right angle triangle of sides 4.0 cm, 3.0 cm and 5.0 cm as shown in the figure. The center of mass of the system is at a point:
A
2.0 cm right and 0.9 cm above 1 kg mass
B
0.9 cm right and 2.0 cm above 1 kg mass
C
0.6 cm right and 2.0 cm above 1 kg mass
D
1.5 cm right and 1.2 cm above 1 kg mass
2
JEE Main 2019 (Online) 12th April Evening Slot
+4
-1
Three particles of masses 50 g, 100 g and 150 g are placed at the vertices of an equilateral triangle of side 1 m (as shown in the figure). The (x, y) coordinates of the centre of mass will be :
A
$$\left( {{{\sqrt 3 } \over 4}m,{5 \over {12}}m} \right)$$
B
$$\left( {{7 \over {12}}m,{{\sqrt 3 } \over 8}m} \right)$$
C
$$\left( {{7 \over {12}}m,{{\sqrt 3 } \over 4}m} \right)$$
D
$$\left( {{{\sqrt 3 } \over 8}m,{7 \over {12}}m} \right)$$
3
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of 0.70 ms–1 with respect to the man. The speed of the man with respect to the surface is :
A
0.28 ms–1
B
0.47 ms–1
C
0.20 ms–1
D
0.14 ms–1
4
JEE Main 2019 (Online) 10th April Morning Slot
+4
-1
Two particles, of masses M and 2M, moving, as shown, with speeds of 10 m/s and 5 m/s, collide elastically at the origin. After the collision, they move along the indicated directions with speeds u1 and u2, respectively. The values of u1 and u2 are nearly :
A
6.5 m/s and 3.2 m/s
B
6.5 m/s and 6.3 m/s
C
3.2 m/s and 6.3 m/s
D
3.2 m/s and 12.6 m/s
EXAM MAP
Medical
NEET