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Easy
Question
A ball of mass ‘m’ is rotating in a circle of radius ‘r’ with speed v inside a smooth cone as shown in figure. Let N be the normal reaction on the ball by the cone, then choose the wrong option.
The correct answer is:
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physics-
System shown in the figure is released from rest when spring is unstretched. Pulley and spring is massless and friction is absent everywhere. The speed of 5 kg block when 2 kg block leaves the contact with ground is (Take force constant of spring k = 40 N/m and 
System shown in the figure is released from rest when spring is unstretched. Pulley and spring is massless and friction is absent everywhere. The speed of 5 kg block when 2 kg block leaves the contact with ground is (Take force constant of spring k = 40 N/m and
physics-General
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Two blocks of masses 
are connected by a non - deformed light spring. They are lying on a rough horizontal surface. The coefficient of friction between the blocks and the surface is 0.4. What minimum constant force F has to be applied in horizontal direction to the block of mass m1 in order to shift the other block? 
Two blocks of masses are connected by a non - deformed light spring. They are lying on a rough horizontal surface. The coefficient of friction between the blocks and the surface is 0.4. What minimum constant force F has to be applied in horizontal direction to the block of mass m1 in order to shift the other block?
physics-General
physics-
In the figure shown the spring constant is K. The mass of the upper disc is m and that of the lower disc is 3m. The upper block is depressed down from its equilibrium position by a distance 
=5mg/K and released at t=0. Find the velocity of ‘m’ when normal reaction on 3m is mg
In the figure shown the spring constant is K. The mass of the upper disc is m and that of the lower disc is 3m. The upper block is depressed down from its equilibrium position by a distance =5mg/K and released at t=0. Find the velocity of ‘m’ when normal reaction on 3m is mg
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physics-
A block of mass 'm' is released from rest at point A. The compression in spring, when the speed of block is maximum
A block of mass 'm' is released from rest at point A. The compression in spring, when the speed of block is maximum
physics-General
physics-
A uniform rod of length l and mass m is allowed to rotate in a horizontal plane about a vertical axis OO¢ passing through one of its ends with an angular velocity 
. Then the tension in the rod in terms of distance x measured from the axis of rotation is:
A uniform rod of length l and mass m is allowed to rotate in a horizontal plane about a vertical axis OO¢ passing through one of its ends with an angular velocity . Then the tension in the rod in terms of distance x measured from the axis of rotation is:
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physics-
A particle P of mass m is attached to a vertical axis by two strings AP and BP of length l each. The separation AB=l. P rotates around the axis with an angular velocity . The tensions in the two strings are 
A particle P of mass m is attached to a vertical axis by two strings AP and BP of length l each. The separation AB=l. P rotates around the axis with an angular velocity . The tensions in the two strings are
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physics-
A single wire ACB passes through a smooth ring at C which revolves at a constant speed in the horizontal circle of radius r as shown in the fig. The speed of revolution is
A single wire ACB passes through a smooth ring at C which revolves at a constant speed in the horizontal circle of radius r as shown in the fig. The speed of revolution is
physics-General
physics-
A body is thrown with a velocity of 10 m/s at an angle of 45° to the horizontal. The radius of curvature of its trajectory in 
sec after the body began to move is :
A body is thrown with a velocity of 10 m/s at an angle of 45° to the horizontal. The radius of curvature of its trajectory in sec after the body began to move is :
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physics-
Two identical blocks of weight W are placed one on top of the other shown in figure. The upper block is tied to the wall. The coefficient of static friction between B and ground is 
and friction between A and B is absent when F = mw force is applied on the lower block as shown. The tension in the string will be
Two identical blocks of weight W are placed one on top of the other shown in figure. The upper block is tied to the wall. The coefficient of static friction between B and ground is and friction between A and B is absent when F = mw force is applied on the lower block as shown. The tension in the string will be
physics-General
physics-
Block A is placed on cart B as shown id figure. If the coefficients of static and kinetic friction between the 20 kg block A and 100 kg cart B are both essentially the same value of 0.5 
Block A is placed on cart B as shown id figure. If the coefficients of static and kinetic friction between the 20 kg block A and 100 kg cart B are both essentially the same value of 0.5
physics-General
physics-
For the two blocks initially at rest under constant ext. forces of mass1 kg and 2kg shown, 
Which of the following is correct?
For the two blocks initially at rest under constant ext. forces of mass1 kg and 2kg shown, Which of the following is correct?
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Three blocks lie on each other as shown. Horizontal force F (variable) is applied on block A. Choose the correct statements.
Three blocks lie on each other as shown. Horizontal force F (variable) is applied on block A. Choose the correct statements.
physics-General
physics-
A smooth bead B of mass 0.6 kg is threaded on a light inextensible string whose ends are attached to two identical rings, each of mass 0.4 kg. The rings can move on a fixed straight horizontal wire. The system rests in equilibrium with each section of the string making an angle 
with the vertical, as shown in the diagram.
A smooth bead B of mass 0.6 kg is threaded on a light inextensible string whose ends are attached to two identical rings, each of mass 0.4 kg. The rings can move on a fixed straight horizontal wire. The system rests in equilibrium with each section of the string making an angle with the vertical, as shown in the diagram.
physics-General
physics-
On a particle moving on a circular path with a constant speed v, light is thrown from a projectors placed at the centre of the circular path. The shadow of the particle is formed on the wall. the velocity of shadow up the wall is
On a particle moving on a circular path with a constant speed v, light is thrown from a projectors placed at the centre of the circular path. The shadow of the particle is formed on the wall. the velocity of shadow up the wall is
physics-General
physics-
In the figure shown, the minimum force F to be applied perpendicular to the incline so that the block does not slide is
In the figure shown, the minimum force F to be applied perpendicular to the incline so that the block does not slide is
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