Please help!! Instructions: Write the letter of each wave on the line before its possible speed. Each term is used only once.

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.