Question

अचानक तब्येत बबघडल्यामुळे अधाण हदवस घरी जाण्यासाठी परवानगी देण्यासाठी वगशणिक्काांना पत्र शलहा.​

Answer 1

In a single fixed pulley, some effort is wasted in overcoming friction between the strings and the grooves of the pulley; so the effort needed is greater than the load and hence the mechanical advantage is less than the velocity ratio.

This is because of some effort is wasted in overcoming the friction between the strings and the grooves of the pulley.

This is because mechanical advantage is equal to the total number of pulleys in both the blocks.

The efficiency depends upon the mass of lower block; therefore efficiency is reduced due to the weight of the lower block of pulleys.