The Poynting vector S⃗ S→S_vec gives the energy flux per unit area of electromagnetic waves. It is defined by the relation S⃗ =E⃗ ×B⃗ μ0S→=E→×B→μ0. Calculate the time-averaged Poynting vector ⟨S⃗ ⟩⟨S→⟩ of the wave considered in this problem.

Calculate the kinetic energy of earth due to its spinning about its axis. krot = j compare your answer with the kinetic energy of the orbital motion of earth's center of mass about the sun. assume earth to be a homogeneous sphere of mass 6.00 1024 kg and radius 6.40 106 m. the radius of earth's orbit is 1.50 1011 m.

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be

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