Question

A bimetallic strip" consists of two thin strips of different metals fastened together like two slices of bread in a sandwich. If the bimetallic stip is held horizontally where the bottom strip is brass, with a coefficient of expansion 1. 5 times greater than the coefficient of expansion of steel strip. The strip is straight at room temperature: a) but. will bend upward when the strip is heated b) but will bend downward when the strip is heated c) will just get longer, without any bending, when the strip is heated d) will just get shorter, without any bending, when the strip is heated e) but will bend to the left when the strip is heated A siren on a tall pole produces a 90 dB sound intensity level at a distance 30 in away from the siren. Assuming a uniform distribution of sound in all directions, what would be the power output of the siren. a) 3. 5 times 10^-7 W b) 44 W c) 11 W d) 1. 0 times 10^-12 W e) 1. 0 times 10^-3 W In isobaric expansion the pressure remains constant. In such an expansion a) no work is done b) work is done by a gas c) work is done on the gas d) isobaric and expansion are contradictory terms e) work may or may not be done depending on whether the temperatures of the gas changes

Answer 1