1
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+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
$$\left( {{{\sqrt 3 } \over 8}m,{7 \over {12}}m} \right)$$
2
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+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
3
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+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
4
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A particle of mass 'm' is moving with speed '2v' and collides with a mass '2m' moving with speed 'v' in the same direction. After collision, the first mass is stopped completely while the second one splits into two particles each of mass 'm', which move at angle 45° with respect to the origianl direction. The speed of each of the moving particle will be :-
A
2 $$\sqrt2$$v
B
v / (2 $$\sqrt2$$ )
C
v / $$\sqrt2$$
D
$$\sqrt2$$v
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12
© ExamGOAL 2024