Question

Q. 1) ਮੁੱਖ ਥੈਲੀ ਵਿਚੋਂ ਖਾਲੀ ਥੈਲੀਆਂ ਭਰੋ।
Fill empty bags from the main bag.
ਮੁੱਖ ਥੈਲੀ
-2 0
4
9 3
(Main Bag)
O
C
O
O
.
ਪ੍ਰਾਕ੍ਰਿਤਿਕ ਸੰਖਿਆਵਾਂ ਪੂਰਨ ਸੰਖਿਆਵਾਂ ਸੰਪੂਰਨ ਸੰਖਿਆਵਾਂ ਪਰਿਮੇਯ ਸੰਖਿਆਵਾਂ
(Natural Numbers) (Whole Numbers) (Integers) (Rational Numbers)​

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.