A corn cob, shaped some what like a cone has the radius of its broadest end as 2.1 cm and length as 20 cm. if each 1cm square of the surface of cob carries an average of four grains. Find how many grains you would find an entire cob
Home
/
A corn cob, shaped some what like a cone has the radius of its broadest end as 2.1 cm and length
Verified answer
Answer:
531
Step-by-step explanation:
CSA of cone cob = πrl
r=2.1cm,h=20cm
Now, l=
r
2
+h
2
=
(2.1)
2
+(20)
2
l=
404.41
=20.11cm
∴ CSA of corn cab =
7
22
×2.1×20.11=132.73cm
2
Number of grains on 1 cm
2
of the surface corn cob =4
∴ Number of grain on 132.73 cm
2
of the surface of corn cab =132.73×4≈531
Please refer to the attachment ✌️