# What length of a solid cylinder 2 cm in diameter must be taken to recast into a hollow cylinder of length 16 cm, external diameter 20 cm and thickness 2.5 mm?

Given,

Length of solid cylinder = L

diameter o cylinder = 2 cm

Volume of cylinder = πr2L..............(i)

Length of hollow cylinder = 16 cm

External diameter = 20 cm

thickness = 2.5 mm = 0.25 cm

so,

inner radius = 10 - 0.25 = 9.75 cm

Volume =

From (i) and (ii)

=

= L =79 cm

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Area of Polygons41 mins
Quiz | Imp. Qs on Polyhedrons38 mins
Lets Roll Around a Circle51 mins
The History and Chemistry Behind a Matchstick!37 mins
Lets Make a Timetable and Crack Olympiad40 mins
Be a Master of Chemical Properties in 30 minutes !29 mins
Concentration makes you a Champ30 mins
Quiz on Be a Crackerjack to Extinguish Different Types of Fires30 mins
Discovery and Types of Microorganisms42 mins
Indian Mythology on Characteristics of a Good Student29 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses