An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
(a) 32 N
(b) 0 N
(c) 2 N
(d) 8 N
1 Answers
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A chain of 2 m, on table such has 60 cm hanged from edge of the table. Mass of chain=4 kg. Work done to pull the entire chain on the table is.
Given M and L are total length and mass of the chain. M = 4 kg L = 2 m And let length and mass of part of chain hanging down are l and m...
1 Answers 1 views
A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal
The work down by the gravitational force acting on the body is zero because the direction of force is vertically downward and the displacement is horizontal i.e. force and displacement...
1 Answers 1 views
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
The object is in motion, so its energy = kinetic energy = 1 /2 mv2 The kinetic energy of the object, when it comes to rest = 0. Work done on object...
1 Answers 1 views
From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s- '1. Calculate the initial recoil velocity of the rifle.
Mass of the rifle, m1 = 4 kg Mass of the bullet, m2 = 50g = 0.05 kg Recoil velocity of the rifle = v1 Bullet is fired with an initial velocity, v2...
1 Answers 1 views
An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity?
Yes. Even when an object experiences a net zero external unbalanced force, it is possible that the object is travelling with a non-zero velocity. This is possible only when the...
1 Answers 1 views
One end of a string of length l is connected to a particle of mass m and the other to a small peg on a smooth horizontal table.
(i) T When a particle connected to a string revolves in a circular path around acentre, the centripetal force is provided by the tension produced in the string. Hence, in the...
1 Answers 1 views
A trolley of mass 300 kg carrying a sandbag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track.
The sand bag is placed on a trolley that is moving with a uniform speed of 27 km/h. The external forces acting on the system of the sandbag and the...
1 Answers 1 views
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m.
(d) : Acceleration of block (a) = (Force applied)/(Total mass) or a = P/(M + m) Therefore, Force on block = Mass of block x a = MP/(M + m).
1 Answers 1 views
A boy of mass M is applying a horizontal force to slide a box of mass M' on a rough horizontal surface.
The correct answer is (a) μ < μ', M < M' Explanation: The force applied by the boy on the box is equal to the force of friction between the shoes of the boy and...
1 Answers 1 views
A boy of mass M is applying a horizontal force to slide a box of mass M' on a rough horizontal surface,
The correct answer is (a) μ < μ', M < M' Explanation: The force applied by the boy on the box is equal to the force of friction between the shoes of the boy and...
1 Answers 1 views