Physics-
General
Easy

Question

4 A car is moving along a hilly road as shown (side view). The coefficient of static friction between the tyres and pavement is constant and the car maintains a steady speed. If, at one of the points shown the driver applies the brakes as hard as possible without making the tires slip, the magnitude of the frictional force immediately after the brakes are applied will be maximum if the car was at

  1. point A    
  2. point B    
  3. point C    
  4. friction force dame for positions A, B and C    

The correct answer is: point C

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One end of a light rope is tied directly to the ceiling. A man of mass M initially at rest on the ground starts climbing the rope hand over upto a height l . From the time he starts at rest on the ground to the time he is hanging at rest at a height l , how much work done on the man by the rope ?

One end of a light rope is tied directly to the ceiling. A man of mass M initially at rest on the ground starts climbing the rope hand over upto a height l . From the time he starts at rest on the ground to the time he is hanging at rest at a height l , how much work done on the man by the rope ?

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A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall,as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x.blank x greater or equal than fraction numerator mu m g over denominator k end fraction Let F subscript m a x end subscript text  and  end text F subscript m i n end subscriptbe the maximum and minimum values of force F for which the block remains in equilibrium. For a particular x, F subscript m a x end subscript text  and  end text F subscript m i n end subscript= 2 N. Also shown is the variation of text Fmax+  end text text Fmin end text text  versus  end text x, the elongation of the spring The value of F subscript m i n end subscript, if x = 3 cm is :

A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall,as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x.blank x greater or equal than fraction numerator mu m g over denominator k end fraction Let F subscript m a x end subscript text  and  end text F subscript m i n end subscriptbe the maximum and minimum values of force F for which the block remains in equilibrium. For a particular x, F subscript m a x end subscript text  and  end text F subscript m i n end subscript= 2 N. Also shown is the variation of text Fmax+  end text text Fmin end text text  versus  end text x, the elongation of the spring The value of F subscript m i n end subscript, if x = 3 cm is :

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A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall,as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x.blank x greater or equal than fraction numerator mu m g over denominator k end fraction Let F subscript m a x end subscript text  and  end text F subscript m i n end subscript be the maximum and minimum values of force F for which the block remains in equilibrium. For a particular x, F subscript m a x end subscript minus F subscript m i n end subscript= 2 N. Also shown is the variation of text  Fmax+  end text text Fmin end text text  versus  end text x, the elongation of the spring The spring constant of the spring is:

A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall,as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x.blank x greater or equal than fraction numerator mu m g over denominator k end fraction Let F subscript m a x end subscript text  and  end text F subscript m i n end subscript be the maximum and minimum values of force F for which the block remains in equilibrium. For a particular x, F subscript m a x end subscript minus F subscript m i n end subscript= 2 N. Also shown is the variation of text  Fmax+  end text text Fmin end text text  versus  end text x, the elongation of the spring The spring constant of the spring is:

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A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall,as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x x greater or equal than fraction numerator mu m g over denominator k end fraction text  Let  end text F subscript m a x end subscript text  and  end text F subscript m i n end subscriptbe the maximum and minimum values of force F for which the block remains in equilibrium. For a particular x, F subscript m a x end subscript minus F subscript m i n end subscript equals 2 N. Also shown is the variation of Fmax+ Fmin versus x, the elongation of the spring The coefficient of friction between the block and the horizontal surface is :

A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall,as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x x greater or equal than fraction numerator mu m g over denominator k end fraction text  Let  end text F subscript m a x end subscript text  and  end text F subscript m i n end subscriptbe the maximum and minimum values of force F for which the block remains in equilibrium. For a particular x, F subscript m a x end subscript minus F subscript m i n end subscript equals 2 N. Also shown is the variation of Fmax+ Fmin versus x, the elongation of the spring The coefficient of friction between the block and the horizontal surface is :

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Two bodies A and B of masses 10 kg and 5 kg are placed very slightly separated as shown in figure. The coefficients of friction between the floor and the blocks are as mu subscript s end subscript equals mu subscript k end subscript equals 0.4. Block A is pushed by an external force F. The value of F can be changed. When the welding between block A and ground breaks, block A will start pressing block B and when welding of B also breaks, block B will start pressing the vertical wall If F = 50 N, the friction force acting between block B and ground will be :

Two bodies A and B of masses 10 kg and 5 kg are placed very slightly separated as shown in figure. The coefficients of friction between the floor and the blocks are as mu subscript s end subscript equals mu subscript k end subscript equals 0.4. Block A is pushed by an external force F. The value of F can be changed. When the welding between block A and ground breaks, block A will start pressing block B and when welding of B also breaks, block B will start pressing the vertical wall If F = 50 N, the friction force acting between block B and ground will be :

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Two bodies A and B of masses 10 kg and 5 kg are placed very slightly separated as shown in figure. The coefficients of friction between the floor and the blocks are as mu subscript s end subscript equals mu subscript k end subscript equals 0.4. Block A is pushed by an external force F. The value of F can be changed. When the welding between block A and ground breaks, block A will start pressing block B and when welding of B also breaks, block B will start pressing the vertical wall minus If F equals 20 N, with how much force does block A presses the block B

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Borax is converted into B by steps Borax not stretchy rightwards arrow with straight I on top straight H subscript 3 BO subscript 3 not stretchy rightwards arrow with straight capital delta on top straight B subscript 2 straight O subscript 3 not stretchy rightwards arrow with II on top straight B I and II reagents are

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STATEMENT-2 : For a block of mass m placed on rough horizontal surface, the minimum horizontal force required to pull the block is mu m g. The minimum force F applied at angle theta (as shown in figure) to pull the block horizontally may be less than mmg. (Where mu is co-efficient of friction)

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STATEMENT-2 : For a block of mass m placed on rough horizontal surface, the minimum horizontal force required to pull the block is mu m g. The minimum force F applied at angle theta (as shown in figure) to pull the block horizontally may be less than mmg. (Where mu is co-efficient of friction)

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