Explain an amusement park you've ridden discuss the conversion of energy on that ride

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

The energy released by a nuclear fusion reaction is produced when

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.