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Help me out with these two problems plz!!
1) A glass window is to be fitted in an aluminium frame.The temperature on the wrkin day is 40C and the glass window measures exactly 20cm x 30cm.What shld b d size of d aluminium frame so dat thr is no stress on the glass in winter even if the temperature drops to 0C ? Co-effificients of linear exp of glass nd aluminium are 9.0 x 10^-6 /C and 24 x 10^-6 /C respectively. 2)A pendulum clock gives correct time at 20C at a place where g=9.800m/s^2. The pendulum consists of a li8 steel rod connected 2 a heavy ball.It is taken 2 a different place where g=9.788m/s^2. At what temperature will it give correct time? Co-efficient of linear expansion of steel = 12 x 10^-6 /C.
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