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The tail board of a lorry is 1.5 m long and 0.75 m high. It is hinged along the bottom edge to the floor of the lorry. Chains are attached to the top corners of the board and to the sides of the lorry so that when the board is in a horizontal position the chains are parallel and inclined at 45° to the horizontal. A tension spring is inserted in each chain so as to reduce the shock and these are adjusted to prevent the board from dropping below the horizontal. Each spring exerts a force of 60 N/mm of

The tail board of a lorry is 1.5 m long and 0.75 m high. It is hinged along the bottom edge to the floor of the lorry. Chains are attached to the top corners of the board and to the sides of the lorry so that when the board is in a horizontal position the chains are parallel and inclined at 45° to the horizontal. A tension spring is inserted in each chain so as to reduce the shock and these are adjusted to prevent the board from dropping below the horizontal. Each spring exerts a force of 60 N/mm of

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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The tail board of a lorry is 1.5 m long and 0.75 m high. It is hinged along the bottom edge to the

floor of the lorry. Chains are attached to the top corners of the board and to the sides of the lorry

so that when the board is in a horizontal position the chains are parallel and inclined at 45° to the

horizontal. A tension spring is inserted in each chain so as to reduce the shock and these are adjusted

to prevent the board from dropping below the horizontal. Each spring exerts a force of 60 N/mm of

extension.

Find the greatest force in each spring and the resultant force at the hinges when the board falls

freely from the vertical position Assume that the tail board is a uniform body of mass 30 kg.

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