Question
The difference between the external and internal curved
surface areas of a 7 cm long cylindrical metallic pipe is 110 cm². If the pipe is made of 302.5 cm³ metal, then find the inner radius of the pipe. (Use π = 22/7)Solution
Let the outer and inner radius of the pipe be R and r centimeter respectively. According to the question, 2πR × 7 - 2πr × 7 = 110  2x22/7x 7 x (R- r) =110  44(R-r) = 110 (R-r) =110/44 (R-r) = 2.5     .... (1) According to the question, π (R2 – r2) x 7 = 302.5 = 22/7 × 7 × (R2-r2) = 302.5 (R2-r2)) =302.5/22 (R2-r²) =13.75 (R+r) (R-r) = 13.75 (R+r) x 2.5 = 13.75              (From 1) (R+r) = 13.75/2.5  (R+ r) = 5.5 .... (2) Solving (1) and (2), R = 4 and r = 1.5 The inner radius of the pipe is 1.5 cm.
A loan is categorised as NPA when its interest or principal repayment become overdue for more than 180 days
Which number will come at the end of the number series?
85, 77, 70, 64, 59, 55, _____?
From which state does the distinguished tennis player Rohan Bopanna, who recently retired, originate?
P-Notes are instruments issued by registered FII to overseas investors, who wish to invest in the Indian stock markets without registering themselves w...
Which of the following cities is not situated at the river bank of the Ganges?
In which year were the Operation Shakti nuclear tests conducted by India?
The Government of India launched the PRASAD (Pilgrimage Rejuvenation And Spiritual Augmentation Drive) scheme in the year ____ under the Ministry of Tou...
In which of the following years, progressive liberalisation of the Indian economy was first initiated?Â
Which of the following is correct?
The largest state of the country India is?
Relevant for Exams:
