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‎APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
B.Tech examinations (S) September 2020 S1/S2 (2015 Scheme)
Course Code: BE 100
Course Name: ENGINEERING MECHANICS
Max. Marks: 100 Duration: 3 Hours
PART A (ANSWER ALL QUESTIONS: 8 X 5 = 40 MARKS)

] F, and 12 are two collinear forces. When they act in opposite directions, their (5)
resultant is 34N, when they act at right angles to each other, their resultant is
50%. Find ए] and ٣.

2 Explain free body diagram with an example. (5)

3 Define Radius of gyration, product of inertia and principal moment of inertia. (5)

4 Using principle of virtual work determine the support reactions at A and Bof (5)
the beam shown below.

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‎5 Show that the acceleration at any instant during simple harmonic motion is (5)
directly proportional to the displacement from the mean position.

‎6 What do you mean by a seconds pendulum?The length of a seconds pendulum (5)
is increased by 1%.How much time will it gain or lose per day?

‎7 State D’Alemberts principle. Draw the free body diagram of a lift of weight (5)
‘W’, moving upwards with an acceleration ‘a’ and also write the equations of
dynamic equilibrium using this principle.

‎8 What is instantancous centre? How can it be located? (5)

‎PART B
SET I
(ANSWER ANY 2 QUESTIONS : 2 X 10 = 20 MARKS)
9. a) State and prove Varignon’s theorem. (5)