An astronaut experiences weightlessness in a space satellite. It is because
the gravitational force is small at that location in space
the gravitational force is large at that location in space
the astronaut experiences no gravity
the gravitational force is infinitely large at that location in space
The displacement of a particle moving along x-axis with respect to time t is x = at + bt2 − ct3. The dimensions of c are
[T-3]
[LT-2]
[LT-3]
[LT3]
A particle moving along a straight line covers half of the distance with a speed of 3 ms-1. The other half of the distance is covered in two equal time intervals with speed of 4.5 ms-1 and 7.5 ms-1. The average speed of the particle (in ms-1) is
5.0
5.5
5.8
4.0
Two cars started moving with initial velocities v and 2 v. For the same deceleration, their respective stopping distances are in the ratio
1 : 1
1 : 2
1 : 4
2 : 1
The distances traversed during equal intervals of time by a freely falling body from rest are in the ratio
1 : 3 : 5 : 7 ....
2 : 4 : 6 : 8 .....
1 : 4 : 9 : 25 .....
1 : 9 : 25 : 49 .....
A.
1 : 3 : 5 : 7 ....
We have,
i.e, S1 : S2 : 1 : 3 : 5
In the entire path of a projectile, the quantity that remains unchanged is
vertical component of velocity
horizontal component of velocity
kinetic energy
potential energy
The sum of magnitudes of two forces acting at a point is 16 N and their resultant N is at 90° with the force of smaller magnitude. The two forces (in N) are
11, 5
9, 7
2, 14
4, 12
A block of mass 10 kg is moving horizontally with a speed of 1.5 ms-1 on a smooth plane. If a constant vertical force 10 N acts on it, the displacement of the block from the point of application of the force at the end of 4 s is
5 m
20 m
12 m
10 m
A block of weight 4 kg is resting on a smooth horizontal plane. If it is struck by a jet of water at the rate of 2 kgs-1 and at the speed of 10 ms-1, then the initial acceleration of the block is
15 ms-2
10 ms-2
5 ms-2
1 ms-2