contestada

Marvin can exert a force of 180 lbs. How heavy a rock can he lift is he uses a crowbar that is 5 ft. long and if he places the fulcrum so that it is 6 in. from the rock?

Respuesta :

musiclover10045

This can be set up as a ratio of the mechanical advantage of the crowbar ( length of crowbar divided by the fulcrum point) and the amount of effort applied:


Weight of the rock = (Effort x length of crowbar in inches) / fulcrum.


Weight of rock = (180 lbs x 60) / 6


Weight of rock= 10800 / 6


Weight of rock = 1,800 pounds.

Otras preguntas