3. (honors) the heat will transfer from the hot object to the cold objects. think
about what that
what will the equilibrium temperature be when a 270g block of copper at 300°c
is placed in a 150-g aluminum calorimeter cup containing 820-g of water at
12.0°c (the cup and the water are at equilibrium before the metal is added). the
specific heat of copper is 0.093 cal/g°c and the specific heat of aluminum is 0.22
cal/g°c.

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?