What should be the tension in a rope pulling vertically upward a mass of 100 kg so that starting from rest it acquires a velocity of 4 m/s in 1.5 seconds?
1278 N
1247 N
1287 N
1894 N
A mass of 1 kg is suspended by a thread. It is
i) lifted up with an acceleration 4.9 m/s2
ii) lowered with an acceleration 4.9 m/s2
The ratio of the tensions is
1:3
1:2
3:1
2:1
A particle of mass m is protected with velocity v making an angle of 450 with the horizontal. When the particle lands on the level ground, the magnitude of the change in its momentum will be
2 mv
zero
The mass of a ship is 2×107 kg. On applying a force of 25×105N, it is displaced through 25 m. The speed of ship is
2.5 m/s
5 m/s
3.7 m/s
12.5 m/s
A certain force applied to a mass m1 gives it an acceleration of 15 m/s2 .The same force applied to a mass m2 gives it an acceleration of 10 m/sec2 .If the two masses are fixed together and the same force is applied to the combination ,find the acceleration
6 ms-2
0.6 ms-2
4 ms-2
none of these
A car of mass 400 kg is pulling a coach of mass 300 kg with a force of 4500 N. If the coefficient of friction is 0.001, what is tension?
2100 N
2126 N
1929 N
2750 N
A force of 6 N acts on a body at rest and of mass 1 kg. During this time, the body attains a velocity of 30 m/s. The time for which the force acts on the body is
7 seconds
5 seconds
10 seconds
8 seconds
A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope? (g=10 m/s2)
5 m/s2
10 m/s2
25 m/s2
2.5 m/s2
A gun of mass 1kg fires a bullet of mass 1g with a velcoity of 1ms-1.The recoil velcotiy of the gun is
1ms-1
0.1ms-1
0.01ms-1
0.001ms-1
In non-inertial frame, the second law of motion is written as
F=ma
F=ma+Fp
F=ma-Fp
F=2ma
