Un sistema de poleas se utiliza para levantar una caja de cartón de 225 N de peso. Para mover la caja una distancia de 1.65 m se requiere aplicar una fuerza de 149 N al extremo libre de la cuerda en el sistema de poleas y moverlo una distancia de 2.75 m. a) ¿Cuál es la ventaja mecánica real? b) ¿Cuál es la eficiencia del sistema de poleas?

What is thought to have caused the mass extinction at the end of the cretaceous period?

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u. s. fish and wildlife service