Some water in a saucepan is boiling a Explain why i external work is done by

# Some water in a saucepan is boiling a explain why i

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Question 2: Some water in a saucepan is boiling. a)Explain why: i.external work is done by the boiling water b)By reference to the first law and your answer in (a), show that thermal energy must be supplied to the water during the boiling process Phase difference (𝝓) : measure of how much one wave is out of step with another wave 𝜙 = 2? ? ? where ? is time period and ? is time lag between waves )
CIE A2-LEVEL PHYSICS//9702 P AGE 10 OF 34 6.4 Graphs of SHM 6.5 Energy in SHM {W08-P04} Question 3: The needle of a sewing machine oscillates vertically through a total distance of 22 mm, The oscillations are simple harmonic with a frequency of 4.5 Hz. The cloth being sewn is positioned 8.0 mm below the needle when the it is at its maximum height. Calculate, for the point of the needle, i.its maximum speed ii.its speed as it moves downwards through the cloth Part (i):Maximum speed can be calculated by ? ? ?