Advertisements
Advertisements
प्रश्न
How many lead balls of radii 1 cm each can be made from a sphere of 8 cm radius?
Advertisements
उत्तर
Volume of sphere = `4/3pir^3`
Volume of sphere = `4/3pi8^3`
= `4/3pi512`
= `682.6667pi`
Volume of lead ball = `4/3pi1^3`
= `1.333333pi`
No. of lead balls that can be made = `(682.6667pi)/(1.333333pi) = 512`
No. of lead balls that can be made = 512
संबंधित प्रश्न
Find the surface area of a sphere of radius 10.5 cm.
`["Assume "pi=22/7]`
A hollow sphere of internal and external radii 6 cm and 8 cm respectively is melted and recast into small cones of base radius 2 cm and height 8 cm. Find the number of cones.
Find the surface area of a sphere of radius 14 cm.
The diameter of the moon is approximately one fourth of the diameter of the earth. Find the
ratio of their surface areas.
The surface area of a sphere is 2464 cm2, find its volume.
From a rectangular solid of metal 42 cm by 30 cm by 20 cm, a conical cavity of diameter 14 cm and depth 24 cm is drilled out. Find: the weight of the material drilled out if it weighs 7 gm per cm3.
The given figure shows the cross-section of a cone, a cylinder and a hemisphere all with the same diameter 10 cm and the other dimensions are as shown.
Calculate :
- the total surface area.
- the total volume of the solid and
- the density of the material if its total weight is 1.7 kg.
Find the volume and surface area of a sphere of diameter 21 cm.
The radius of a sphere is 10 cm. If we increase the radius 5% then how many % will increase in volume?
A spherical ball of radius 3 cm is melted and recast into three spherical balls. The radii of two of the balls are 1.5 cm and 2 cm. Find the diameter of the third ball.
