2. A lever has efficiency 60% and mechanical advantage 4, then (i) Calculate effort require to lift 1000 N load. [250 N]
(ii) Calculate velocity ratio of the lever. [VR = = 6.66]
(iii) Find out output work to turn load up to 20 m. [20,000 Nm]

Prompta snowboarder stands at the top of a hill and decides to see if he can increase his speed on his next trip down the slope.describe one thing the snowboarder could do to incrlase his speed on the slope. explain why this would cause his speed toincrease relate one of newton's laws to this problem.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34