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# The door of an Amirah is 6 ft. high, 1.5 ft. wide and weighs 8 kg. The door is supported by two hinges situated at a distance of 1 ft. from the ends. If the magnitudes of the forces exerted by the hinges on the door are equal, find this magnitude.

Answer :

The magnitude of the force exerted is 43N

Given

The dimensions of an Amirah door are given as 6ft high, 1.5ft wide, and weighs a total of 8 kg, the hinges are situated at a distance of 1ft from the end on both sides.

Formula Used

Using Newton’s second law of motion, we know that force is equivalent to the product of mass and acceleration and the resulting force when multiplied by the radius at which it is turned it becomes torque.

where

F is the force applied on the object, m is the mass of the object, r is the length of rotation of the object and is the torque applied.

Explanation

The force exerted by the two hinges are

Hence, if the value of reactionary forces is equal

Let, the reactionary forces of the first hinge be

With the force and reactionary forces value derived let us find the value of resultant force which is

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Figure 5.9 shows (v_{x} ,t ),and( (v_{y} ,t) diagrams for a body of unit mass. Find the force as a function of time.

Physics - Exemplar

The door of an Amirah is 6 ft. high, 1.5 ft. wide and weighs 8 kg. The door is supported by two hinges situated at a distance of 1 ft. from the ends. If the magnitudes of the forces exerted by the hinges on the door are equal, find this magnitude.

HC Verma - Concepts of Physics Part 1Consider the following two equations

(A)

(B)

In non-inertial frames

HC Verma - Concepts of Physics Part 1