A wood block measures 30 cm by 10 cm, and this block is 5 centimeters thick. The wood block has a weight of 8 Newtons and is floating in water. a. What is the weight of the water displaced by the wood block? (2 points) b. Calculate the height of the water line on the wood block. Show how you start the calculation as well as the calculated answer. (6 points)

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?