A coal power station transfers 3.0×10^12 J by heat from burning coal and transfers 1.5×10^12 J by heat into the environment. What is the efficiency of the power station?

1which body contains the majority of the mass in the solar system earth jupiter the moon the sun 2 what keeps the objects in the solar system such as planets orbiting around the sun the force of gravity the galaxy exerts on all objects within it including the solar system the great distance between the sun and the planets the sun's nuclear fusion which acts on each object the gravitational force between the sun and each object in the solar system

Resistivity of a material is the resistance of a cm long sample of the material of 1 cm2 cross-sectional area.

Ineed the answer to question 9 and 10