Physics Past Questions and Answers

At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? Density of sea water = 1013kg<sup style='font-size: smaller;'>-3</sup>, one atmosphere = 0.01 x 10<sup style='font-size: smaller;'>5</sup>Nm<sup style='font-size: smaller;'>-2</sup>, g = 10ms<sup style='font-size: smaller;'>-2</sup>

What volume of alcohol will have same mass as 4.2m<sup style='font-size: smaller;'>-3</sup> of petrol?<br/>Density of alcohol = 8.4 x 10<sup style='font-size: smaller;'>2</sup>kgm<sup style='font-size: smaller;'>-3</sup>, density of petrol =7.2x10<sup style='font-size: smaller;'>3</sup>kgm<sup style='font-size: smaller;'>-3</sup>

Calculate the length which corresponds to a temperature of 20<sup style='font-size: smaller;'>o</sup>C if the ice and steam points of an unguarded thermometer are 400 mm apart

A wire of length 100.0m at 30<sup style='font-size: smaller;'>o</sup> has linear expansive of 2x10<sup style='font-size: smaller;'>-5</sup>K<sup style='font-size: smaller;'>-1</sup> Calculate the length of the wire at a temperature of - 10<sup style='font-size: smaller;'>o</sup>C

A gas at a pressure of 10<sup style='font-size: smaller;'>5</sup>Nm<sup style='font-size: smaller;'>-2</sup>expands from 0.6m<sup style='font-size: smaller;'>-3</sup> to 1.2m<sup style='font-size: smaller;'>3</sup> at constant temperature, the work done is