Como se generan las ondas mecanicas y por que medios se propagan

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?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?