The teacher asked the students to prepare a project work related to Diwali. Lipsa prepared 12 cylindrical candles each having radius of base 2cm and height 7cm. Himanshu prepared 14 fire crackers each of spherical shape of radius 1.54cm.
a) Find the volume of candles and firecrackers
b) According to you which has better project work and why?
c) Which message has been conveyed in the above information?
(a) Radius of candle, r = 2 cm
Height of candle, h = 7 cm
Volume of one candle = TTr2h
= 22/7*2*2*7
= 88 cm3
Volume of 12 cylindrical candles = 12*88
= 1056 cm3
Radius of spherical fire cracker, r = 1.5 cm = 3/2 cm
Volume of one fire cracker = 4/3TTr3
= 4/3*22/7*3/2*3/2*3/2
= 99/7 cm3
Volume of 14 fire crackers = 14*99/7 = 198 cm3
(b) Lipsa has better project because candles do not pollute the environment
(c) Avoid pollution and save energy