Home
Class 12
PHYSICS
A block of mass 25 kg is raised by a 50 ...

A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases ? If the floor yields to a normal force of 700 N , which mode should the man adopt to lift the block without the floor yielding ?

Text Solution

Verified by Experts

Mass of the block, m = 25 kg, mass of the man, M = 50 kg Force applied to lift the block F = mg `=25xx9.8` = 245 N weight of the man, M g `= 50xx9.8=490 N`
(a) When the block is raised by the men by applying force F in upward direction, reaction equal and opposite of F will act on the floor in addition to the weight of the man.
`therefore"actin on the floor"" "Mg +F = 490 +245=735N`
(b) When the block is raised by the mass applying force F over rhw eopw (passed over the pully) in downward direction, reacton equal and opposite to F will act on the floor,
`therefore"actin on the floor"" "Mg +F = 490 +245=245N`
floor yields to a normal force of 700 n, hte mode (b) should be adopted by the man to life block.
Promotional Banner

Topper's Solved these Questions

  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN|Exercise EXERCISE (S-1)|23 Videos

  • NEWTON'S LAWS OF MOTION & FRICTION

    ALLEN|Exercise EXERCISE (S-2)|9 Videos

  • MOTION IN A PALNE

    ALLEN|Exercise SOLVED EXAMPLE|28 Videos

  • NEWTONS LAWS OF MOTION

    ALLEN|Exercise EXERCISE-III|28 Videos

Similar Questions

Explore conceptually related problems

A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in figure. What is the action on the floor by the man in the two cases ? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?

A block of mass 25 kg is raised by a 50kg man in two different ways as shown in fig. what is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700N , which mode should the man adopt to lift the block without the floor yielding?

A block of mass 'm' is raised by a man of mass m_2 in two different ways as shown ( m_1 = 25kg, m_2 = 50kg)

In fig. the block of mass M is at rest on the floor . At what acceleration with which should a boy of mass m climb along the rope of negligible mass so as to lift the block from the floor?

In fig. the block of mass M is at rest on the floor . At what acceleration with which should a boy of mass m climb along the rope of negligible mass so as to lift the block from the floor?

Two block of masses 2kg and 4kg are released from rest over a smooth inclined place of inclination 30^(@) as shown in figure what is the normal force between the two blocks?

A block of mass 200kg is being pulled by mean on an inclined plane at angle of 45^(@) as shown. The coefficient of static friction of 0.5. Each man can only apply a maximum force of 500N. The number of men required for the block to just start moving up the plane is :

A block of mass 200 kg is being pulled by some men, up an inclined plane of inclination 45^(@) and coefficient of friction 0.5, as shown in the figure If each man can apply a maximum force of 500N. Calculate number of men required to just slide the block, up the plane is

A wooden block of mass 2 kg rests on a soft horizontal floor . When aniron cylinder of mass 25 kg is placed on top of the block , the floor yields steadily , and the block and the cylinder go down with an acceleration of 0.1 ms^(-2) What is the action of the block on the floor (a) before and (b) after the floor yields ? Take g = 10 ms^(-2) . Identify the action reaction pairs in the problem .

A block of mass 2 kg is at rest on a floor . The coefficient of static friction between block and the floor is 0.54. A horizonatl force of 2.8 N is applied to the block . What should be the frictional force between the block and the floor ? ( take , g = 10 m//s^(2) )