How many silver coins, 2cm in diameter and of thickness 2 mm, must be melted to form a showpiece in the form of a frustum of a cone having height 9 cm and radii of the outer circular ends as 5cm and 3cm?

  1. 👍 0
  2. 👎 1
  3. 👁 357
asked by Simran
  1. if the cone were complete, it would have height 45/2, so the missing part has height 27/2.

    So, if there are x coins,

    (π*0.2*1^2)x = π/3 (5^2*45/2 - 3^2*27/2)
    x = 735

    1. 👍 2
    2. 👎 0
    posted by Steve
  2. l asked for 3 marks ,please reput in step bystep

    1. 👍 0
    2. 👎 0
    posted by jai

Respond to this Question

First Name

Your Response

Similar Questions

  1. Maths

    How many silver coins ,2cm in diameter and of thickness 2mm,must be melted to form a showpiece in the form of frustum of a cone having height 9cm and radii of outer circular ends as5cm 3cm

    asked by Tanu on July 6, 2017
  2. maths

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

    asked by Anonymous on December 19, 2012
  3. Math

    If diameter of iron pipe is 2.8cm and 1mm thickness is melted and cylindrical rod of same length is formed find diameter of rod

    asked by Samu on August 20, 2018
  4. Maths

    An iron pipe of internal diameter 2.8 cm and uniform thickness 1 mm is melted and a solid cylindrical rod of the same length is formed. Find the diameter of the rod.

    asked by Sudan Maharjan on July 19, 2018
  5. Elementary education

    A napkin ring is being made of cast silver. It has the shape of a cylinder 1.25 inches high, with a cylindrical hole 2 inch in diameter and a thickness of 1/16 inch. How many ounces of silver are needed? [silver weighs 6 ounces

    asked by Ashley on April 8, 2016
  6. Mathematics

    Find the volume of a closed cylinder with thickness 1.2cm and diameter 17.1cm take pie=3.14

    asked by Wale on May 29, 2013
  7. Math

    A bag is filled with 200 silver coins and 123 gold coins. What is the theoretical probability of NOT pulling out a silver coin? I keep gettin this wrong .How can i do this ?

    asked by Rose on February 28, 2018
  8. Math

    Museum employees are preparing an exhibit of ancient coins. They have 49 copper coins and 35 silver coins to arrange on shelves. Each shelf will have the same number of copper coins and same number of silver coins. How many

    asked by Amber on September 9, 2009
  9. Math

    1)Forty solid hemisphere each of diameter 2cm , are melted to form a solid cone with a base diameter 6cm .Find the height of the cone? 2)A pyramid has a square base of side 12cm and a height of 15cm .Calculate its volume and total

    asked by Reshma on May 23, 2011
  10. Maths

    Hi im doing measurement at skool at the moment and i cant quite ork out some questions. Can someone please help!! A metal washer has an external diameter of 2cm and an internal diameter of 1cm. A) How many washers can be cut from

    asked by Mave on May 10, 2008

More Similar Questions