Give reasons for the following : (a) In a single fixed pulley, the vel

1.	Give reasons for the following : (a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage. (b) The efficiency of a movable pulley is always less than 100%. (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (d) The lower block of a block and tackle pulley system must be of negligible weight.
Answer» Give reasons for the following : (a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage. (b) The efficiency of a movable pulley is always less than $100 %$ . (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (d) The lower block of a block and tackle pulley system must be of negligible weight.

Give reasons for the following : (a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage. (b) The efficiency of a movable pulley is always less than 100%. (c) In case of a block and tackle system, the mechanical advantage increases with the increase in the number of pulleys. (d) The lower block of a block and tackle pulley system must be of negligible weight.

Answer»

Give reasons for the following :

(a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.

(b) The efficiency of a movable pulley is always less than $100 %$ .

(d) The lower block of a block and tackle pulley system must be of negligible weight.