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 Form 1 Physics Measurement 1 Video Questions and Answers

Describe an experiment to find the density of copper turnings using a density bottle and kerosene.

 (6m 6s)
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Answer Text:
- Measure the mass m_0 of a clean dry empty density bottle.
- Fill the bottle partly with copper turnings and measure mass# m_1#.
- Fill up the bottle with kerosene up to the neck and measure its mass as # m_2#.
- Empty the bottle and rinse it.
- Fill it with kerosene and replace it with the stopper, wipe outside dry and measure the mass m_3 of the bottle filled with kerosene.
Mass of kerosene= #(m_3-m_0) g#
Volume of kerosene = #((m_3 -m_0))/0.8 cm^3 #
(Since density of kerosene 0.8#gcm^(-3))#
Mass of copper turnings =# (m_1-m_0) g #
Mass of kerosene present when the bottle is filled with copper turnings and kerosene =# (m_2-m_1)# g
Volume of kerosene = #((m_2-m_1))/0.8 cm^3 #
Volume of copper turnings = #({(m_3 -m_0) - (m_2-m_1)})/0.8 cm^3 #
Therefore density of copper turnings = #(0.8(m_1-m_0) )/({(m_3 - m_0) - (m_2-m_1)})#