The sun generates both mechanical and electromagnetic waves. which statement about those waves is true?

the mechanical waves reach earth, while the electromagnetic waves do not.

the electromagnetic waves reach earth, while the mechanical waves do not.

both the mechanical waves and the electromagnetic waves reach earth.

neither the mechanical waves nor the electromagnetic waves reach earth.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.