Second Law of Motion
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\( M \) \( M \) (ii)
- Force on m is mFM+m in (ii)
- am=aM=FM+m in (ii)
- am=aM=FM+m in (i)
- am=0 and aM=FM in (i)
A rocket with a lift-off mass 3.5×104 kg is blasted upwards with an initial acceleration of 10m/s2. Then the initial thrust of the blast is
If the force on a rocket moving with a velocity of 300 m/s is 210 N, then the rate of combustion of the fuel is
0.07 kg/s
1.4 kg/s
10.7 kg/s
0.7 kg/s
A 500 kg rocket can be accelerated at a constant rate from rest to 1800 km/h in 2 sec. What is the magnitude of the required net force?
450, 000 N
12, 000 N
125, 000 N
18, 00, 000 N
A 5kg block is tied to a 1m string and is rotated with a constant angular velocity of 2 rad/sec in the horizontal plane. Find the linear momentum of the block.
10 N
5 m/s
2.5 N
10 kg m/s
- 16 metres
- 24 metres
- 32 metres
- 8 metres
On forgetting his 25th anniversary, Vijay as a present from his wife, receives a shoe of 0.5 kg thrown at him with 10 m/s velocity. Find the momentum of assault.
0.5 N
5 kg m/s
10 Kg m/s
5 N
The net force on a body is varying with time as (2t + 3) N. Find the change in momentum of the body after 2 secs?
5 kg m/s
2 kg m/s
10 kg m/s
0 kg m/s
A machine gun fires a bullet of mass 40 g with a velocity of 1200ms−1. The gun can exert a maximum force of 144 N on the bullet. How many bullets can it fire per second at the most?
(AIEEE 2004)
Two
Four
One
Three
In a rocket of mass 1000 kg fuel is consumed at a rate of 40 kg/s. The velocity of the gases ejected from the rocket is 5×104 m/s. The thrust on the rocket is