11. The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is
12. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is
13. Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are
14. A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is
15. In order to double the period of simple pendulum, the length of the string should be
16. The impact between two lead spheres is approximately equal to an __________ impact.
17. The matter contained in a body, is called
18. The maximum efficiency of a screw jack is
19. Moment of inertia is the
20. The total motion possessed by a body, is called
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