Aglass flask whose volume is 1000 cm3 at a temperature of 0.200 ∘c is completely filled with mercury at the same temperature. when the flask and mercury are warmed together to a temperature of 52.0 ∘c , a volume of 8.50 cm3 of mercury overflows the flask.
if the coefficient of volume expansion of mercury is βhg = 1.80×10−4 /k , compute βglass, the coefficient of volume expansion of the glass.
express your answer in inverse kelvins.

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?