A suitable system for measuring the location of events in time and space would be to have a three dimensional grid of measuring rods with a clock at each point on the grid. How should the clocks be synchronized to ensure consistent measurements

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.