A helicopter of mass 1000 kg rises with a vertical acceleration of 15ms-2. The crew and the passenger weight 300 kg give the magnitude force on the floor by the crew and passenger.
10 N
zero
7.5 × 103N
8 N
The linear momentum of body of man in moving with velocity v is
v/m
m/v
mv
1/mv
A constant force acting on a body of mass 20g, produces in it a velocity of 27cm/sec in 6 seconds. If the body starts from rest, then the magnitude of the force is
80 dyne
90 dyne
95 dyne
100 dyne
The acceleration produced in a body by a force of given magnitude depends on
size of body
shape of body
mass of body
none of body
A stream of water flowing horizontally with a speed of 15ms-1 gushes out of a tube of cross sectional area 10-2m2 and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assuming it does not rebound?
2 × 103 N
6 × 103 N
2.25 × 103N
When the glass vessels fall on a hard floor they break, but they do not break when the fall on a carpet or sand. Which law is used?
Newton's 1st law
Newton's 2nd law
Newton's 3rd law
law of conservation of momentum
If an elevator is moving vertically up with an acceleration a, the force exerted on the floor by a passenger of mass M is
Ma
M(g + a)
M(g - a)
Zero
A monkey of mass 40kg climbs on a rope which can stand a maximum tension of 600N. In which of the case the rope break the monkey.
climbs up with an acceleration of 6ms-2
climbs down with acceleration of 4ms-2
climbs up with a uniform speed of 5ms-1
falls down the rope nearly freely under gravity.
A body of mass 10kg moving with a velocity 20ms-1 along a straight line collides with another body of mass 8kg moving in the same direction with a velocity 5ms-1. After collision if the velocity of the former is reduced to 16ms-1, Calculate the final velocity of the latter.
10ms-1
15ms-1
25ms-1
0
