Please do h and g

Please do h and g 'o measure it. and relation with metre. it be avoided? do by Give its standard unit in Sl system. O. t he to measure mass. G. Long answer type questions. l. What are the precautions that are needed to be taken while measuring ofa wooden block using a metre scale? 2 Write a short n Ote on beam balance. 3. Explain how the department of weights and measures, Government of is helping people so that they would not get cheated by the shopkeepers. hallenge Question a ruler is broken and its zero mark is not visible. The first visible mark 3 cm. Find the length of a piece of cardboard if the marking on the ruler at r end of the object is 10 cm. Give suitable reasons for your answer. ct—Measuring diameter of a ball using the ruler II need: a ruler, two wooden blocks and a ball e ball between the two wooden blocks on djust the position of the blocks such that touching the spherical object become 2 18-6- 16:55

Dear student,
Post multiple queries in different threads.
The answer to question number G 2 is below,

A beam balance works on the principle of ‘moment of force’.

If the mass of A and B are equal then the weights FA and FB will also be equal. Since, the support of the beam is at the middle, the moment of force (product of force and distance between the end and the middle of the beam) due to the two forces at the mid-point O will cancel each other and will be zero. In this case, the beam is balanced and hence we conclude that the two masses are equal.

If the mass of A is greater than B, then the moment due to force FA about O will be greater than the moment due to force FB about O. So, the beam will align downwards on the side of mass A.
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