Question

a bucket full of water is raised from a well by means of a rope which is wound round a pulley of diameter 77 cm. bucket takes 1min 28 seconds to ascend at a uniform speed of 1.1 m/sec. find the no. of revolutions which the pulley makes in raising the bucket.​

Answer 1

length of rope=1.1m/s÷1.28min

=8448cm

then diameter of pulley =77cm

circumference of pulley=242cm

:no of rotations is =

lenghth of rope/ circumference of pulley

=8448÷242=35rotations

Answer 2

See the solution carefully

according to question

length of rope=11×98. (1min 28sec=98sec)

=1078m

circumference of pulley= 2×22/7 ×.77

=.44m

now,no.of revolution =circumference/length of rope

= 1078/.44

=2450 revolutions

hope it helps you dude

be brainly✌️