A hollow iron pipe with an exterior diameter of 8 cm is 21 cm long. The weight of a pipe with a thickness of 1 cm and an iron density of 8 g/cm3 is:
A. 3.6 kg
B. 3.696 kg
C. 36 kg
D. 36.9 kg
Answer:B
A hollow iron pipe with an exterior diameter of 8 cm is 21 cm long. The weight of a pipe with a thickness of 1 cm and an iron density of 8 g/cm3 is:
A. 3.6 kg B. 3.696 kg C. 36 kg D. 36.9 kg
Explanation: 4 cm external radius.3 cm internal radius.Iron volume = 22/7x [(4)2 - (3)2] x 21 cm3.7 x 1 x 21 cm3 = 22/7x 7 x 1 x 21 cm3,462 cm3 =(462 x 8) gramme = 3696 gm = 3.696 kg iron weight.