An army vehicle of mass 1000 kg is moving with a velocity of 10 m/s and is acted upon by a forward force of 1000 N due to engine and a retarding force of 500 N due to friction.What will be its velocity after 10 sec ?
5 m/s
10 m/s
15 m/s
20 m/s
A lift is moving upward with increasing speed with acceleration 'a'.The apparent weight will be :
less than the actual weight
more than the actual weight and have a fixed value
more than the actual weight which increases as long as velocity increases
zero
A boy of mass 50 kg is standing on a weighing machine placed on the floor of a lift.The machine reads his weight in Newtons.What is the reading of the machine if the lift is moving upwards with a uniform speed of 10 m/sec2?
(g = 10 m/sec2 )
510 N
480 N
490 N
500 N
A force of 15 Newton acts on a body of weigh 30 Newton. What is the acceleration produced in metres per second?
Take g = 10ms-2.
15.00
5.00
1.50
0.50
A horse pulls the cart. Which of the following forces makes the cart move?
force exerted by the horse on the cart
force exerted by the ground on the cart
force exerted by the ground on the horse
force exerted by the horse on the ground
A disc revolves in a horizontal plane at a sready rate of 3 r.p.s.A coin will remain on the disc if it is kept at a distance of 2 cm from the axis of rotation.What is the coeffecient of friction between the coin and the disc? g = 9.8 m/s2
0.724
0.856
0.987
0.685
A rocket with a lift of mass 20,000 kg is blasted upward with an initial acceleration of 5 m/s2 .Calculate the initial thrust of the blast.
3.25 x 105 N
2.96 x 105 N
4.35 x 105 N
1.45 x 105 N
Physical independence of force is a consequence of
third law of motion
second law of motion
first law of motion
All of the above
A cricket player catches a ball of mass 100 g and moving with a velocity of 25 ms-1. If the ball is caught in 0.1s, the force of the blow exerted on the hand of the player is
4 N
25 N
40 N
250 N
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
