a steel pully was made from 2 big cylinders of diameter 10 centimetre each and length 7 cm, stuck at the ends of a small cylinder of diameter 7 cm and length 3.5 cm find the length of the police 1 cm cube of steel weighs 7.6 grams.
crazygirlriya:
can u able to get it
no
what I'm saying is about the diagram
Btw two cylinder their is a small cylinder
and what to find?
Volume of pulley
but why you mentioned weight
After finding the volume we have to multiple it by 7.6 grams
so you mean to find its weight
Ya
Answers
Answered by
3
volume of cylinder
= πr²h
for big
r = 5cm, h = 7cm
so
V = π×25×7
= 175π cm³
for small
r = 3.5cm, h = 3.5cm
so
V = π×12.25×3.5
= 42.875π cm³
so
net volume
= 2(175π) + 42.875π cm³
= (350+42.875)π cm³
= 392.875π cm³
so
weight of Polly's
= 7.6 × 392.875π
= 2985.85π gm
= πr²h
for big
r = 5cm, h = 7cm
so
V = π×25×7
= 175π cm³
for small
r = 3.5cm, h = 3.5cm
so
V = π×12.25×3.5
= 42.875π cm³
so
net volume
= 2(175π) + 42.875π cm³
= (350+42.875)π cm³
= 392.875π cm³
so
weight of Polly's
= 7.6 × 392.875π
= 2985.85π gm
But i got 1234.75 cm2
Ya u left pi as such
ya correct
tqs a lot for ur help
my pleasure
Hmmm
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volume of a cylinder pi r ^2 h
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