I need help with 3 maths sums. Here they are, plz give the answer with procedure
First Question
Ten open cylindrical containers are to be painted on the outside, including the base. Each container has a radius of 30cm and a height of 28cm. Given that 150g of paint is needed to paint an area of 1m square, find the amont of paint required to paint the ten cylinders. Give your answer in kg.
Second Question
A cylindrical barrel 70 cm in diameter and 80 cm in height is filled with water. A leak at the bottom drains away 0.2 litres of water every minute. HOw long will it take for the water level to drop by 6cm?
Third Question
The Singapore Expo has an exhibition area of 60000m square, making it the largest exhibition centre in the region. If the average height of the exhibition centre is 4.85m, find the volume of air in it. If the density of the air is approx. 1.26kg/m cube, find the mass of air contained in the exhibition centre.
PLz ans the sums with procedure. Thnx
2006-07-17 20:42:49 · 3 answers · asked by Faizan 1 in Education & Reference ➔ Homework Help
One more question plz
It took two and a half years and 2.85 million m cube of earth to fill the disused Sin Seng quarry in Rifle Range Road.
a) If each truck can carry 5.75 m cube of earth per trip, how many trips are needed to fill the quarry?
b) Taking one year to be 365 days, find the number of trucks loaded ferried per day for the above project, giving your answer correct to the nearest whole number
YOu may answer any one of these but plz do answer, I really need to know these, I will be very thankfull to you all.
2006-07-17 20:47:27 · update #1
LOL I am DONE with homework until September!!! Sorry you are on your own!
2006-07-17 20:52:17 · answer #1 · answered by jennifersuem 7 · 0⤊ 0⤋
kid r u takin' help or makin' us do ur work??
nywyz i can give u da procedure....try n solve ur self!
QI: find da area to b painted of 1 cylinder with da formula
(2*pi*r*h)+(pi*r*r)
where (2*pi*r*h) is da leteral surface are and (pi*r*r)is da area of base as da cylinder is open at one end!
multiply by 10 to get total area to b painted (in sq. cm) and convert it into sq.m by dividin' by 10000!
now i m sq. reqires 150g den ur above result will require
(total area*150)g.
divided da answer by 1000, u get da paint req. in kgs!
its as simple as tht!
needa go...ll answer other on later1
2006-07-18 04:04:24 · answer #2 · answered by student_90 2 · 0⤊ 0⤋
hahahahahahahahahaha ya right do your own homework
2006-07-18 03:45:30 · answer #3 · answered by crimson_king32 1 · 0⤊ 0⤋