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Smallest change a sensitive beam balance can record is

A glass bulb is balanced by a brass weight in a sensitive beam balance. Now the balance is covered by a bell-jar which is then evacuated; then

A glass bulb is balanced by a brass weight in a sensitive beam balance. Now the balance is covered by a glass-jar which is then evacuated. Then

Beam PQRS has internal hings in spans PQ and RS as shown. The beam may be subjected to a moving distributed vertical load of maximum intensity 4 kN/m of any length anywhere on the beam. The maximum ab

A coin placed on a gramophone record rotating at 33 r. p. m. files off the record, if it is placed at a distance of more than 16 cm from the axis of rotation. If the record is revolving at 66 r. p. m.

A 20 N metal block is suspended by a spring balance . A beaker containing some water is placed on a weighing machine which reads 40 N. The spring balance is now lowered so that block gets immersed in

The angles of a quadrilateral are in the ratio of 2:4:7:5. The smallest angle of the quadrilateral is equal to the smallest angle of a triangle. One of the angles of the triangle is twice the smallest