3. A spring balance had graduation 0, 10, 20, 30,
40 and 50 in g-wt. A student notice that the
pointer of the spring balance has indicating the
third graduation mark after 0 mark when it
hang vertically in iron stand without any metallic
object. When metallic object hang with its lower
hook, pointer indicating the 30th graduation
mark. The space between 40 and 50 was divided
into 10 equal divisions. Find:
(a) Zero error in spring balance
(6) Correct weight of the metallic object.
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Answer:
hiii
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