Reg No.:

Max. Marks: 100

NSA192004

Cm റ ७ 3
APJ ABDUL KALAM TECHNOLOGICAL UNIV

Course Code: EST100
Course Name: ENGINEERING MECHANICS
(2019-Scheme)

PARTA
(Answer all questions, each carries 3 marks.)
A ladder of weight 30 kg is supported at wall and floor as shown in fig 1 below. A

man of weight 72 kg stands on it vertically, 8 m above the floor level. There is a 100
kg force acting at top-most point of the ladder vertically. The mass distribution of the
ladder is uniform. Considering all contact surfaces smooth, draw the free body

diagram.

Fig 1

State and explain Varignon’s theorem for concurrent coplanar forces.

Briefly explain the analysis of forces acting on a wedge with a suitable example.

A simply supported beam AB of span 4m is carrying point loads 10N, 6N & 4N at
Im, 2m & 3m respectively from support A. Calculate reactions at supports A and 8.
A force 2i+4j-3k is applied at the point A(1,1,-2). Find the moment of the force
about the point (2,-1,2)

Calculate the area moment of inertia of a rectangular cross-section of breadth ‘b’ and
depth ‘d’ about the centroidal horizontal axis.

A body is projected at an angle such that its horizontal displacement is 3 times that of
maximum height. Find the angle of projection.

The position of a particle moving along a straight line is defined by the relation

‎४३ - 3६ - 9८ + 12‏ دع

‎Determine the time taken by the particle when its velocity becomes zero.

‎A flywheel weighing 500N and having radius of gyration 0.4 m loses it speed from
300rpm to 180 rpm in 1 minute. Calculate the torque acting on it.

‎Distinguish damped and undamped free vibrations.

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‎FIRST SEMESTER B.TECH DEGREE EXAMINATION(2019 SCHEME), DECEMBER 2019

‎Duration: 3 Hours

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