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ESE 2019: Engineering Mechanics Quiz-3

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Question 1

Find the effort required by a crow bar to move the load of 650N?






Question 2

A car starts from rest and accelerates at a speed of 35 m/s in time 18 seconds. Find the average acceleration of the car?

Question 3

If m is the number of unknown member forces and c be the number of unknown components which is statically determinate with j being number of joints, then degree of internal indeterminacy will be:

Question 4

A car of mass 1450 kg is constructed on a chassis supported by four springs. Each spring has a force constant of 40000 N/m. The combined mass of the two people occupying the car is 150 kg. What is the period of execution of two complete vibrations?

Question 5

Two steel balls of 2 kg and 4 kg mass, respectively are pressed on the two ends of a spring, all pre-placed on a smooth surface. When released, the smaller ball moves with an acceleration of 2 m/s2. The simultaneous acceleration of the bigger ball will be :

Question 6

A ball of weight 100 N is tied to a smooth wall by a cord making an angle of 30 ° to the wall.
The tension is the cord is :

Question 7

Two motor-cyclist driving at uniform speeds s1 and s2 respectively in straight line path in opposite directions and come closer 11 m after every second. While running in similar direction, their speeds reduces by 50% and get 0.7m closer in every second. The speeds s1 and s2 of the motor cyclist will be:

Question 8

Multiple forces are acting on the bar as shown, Find the total moment around point X on the bar?

Question 9

Sum of magnitudes of two forces acting at a point is 24 N and magnitude of resultant is 16 N. If resultant is at 90 º with smaller force, find the approximate magnitude of forces?

Question 10

A: A sphere can be moved easily than a rectangular block of same mass.
R: Friction is more for the rectangular block, as its area of contact is larger.
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