10 second questions

Jai Ganesh · 2011-01-16 00:50:47

Hi bobbym,

The solutions to 2659 and 2660 are correct. Neat job!

#2661. A solid sphere with the total surface area 24 cm.square is bisected into 2 hemispheres. What is the total surface area of any one of the hemispheres?

#2662. What is the ratio of the volumes of three solids namely cylinder, cone, and hemisphere having equal base area and height?

bobbym · 2011-01-16 01:04:54

Hi ganesh;

Jai Ganesh · 2011-01-17 00:46:08

Hi bobbym,

The solutions 2661 and 2662 are correct. Keep it up!

#2663. The area of cross section of a cylinder is 44 square cm. If its height is 10 cm, then what is its volume?

#2664. The base area of a cone is 9

square cm. Its slant height is 5 cm. What is its height?

bobbym · 2011-01-17 01:08:24

Hi ganesh;

Howardroark · 2011-01-17 02:58:15

Hi Ganesh,

Jai Ganesh · 2011-01-18 00:31:36

Hi bobbym and Howardroark,

The solutions to 2663 and 2664 are correct. Splendid!

#2665. A well of diameter 2.1 m is dug to a depth of 4 m. What is the volume of earth removed?

#2666. What is the total surface area of a solid cylinder with base area

sq.units and curved surface area sq.units?

bobbym · 2011-01-18 06:54:29

Hi ganesh;

Howardroark · 2011-01-18 14:48:58

Hi Ganesh,

Howardroark · 2011-01-18 14:52:04

Hi,

Jai Ganesh · 2011-01-19 00:54:12

Hi bobbym and Howardroark,

The solutions are correct 100% Howardroark and 50% bobbym. The solution is 4.41

to 2665, bobbym.

Well done, both of you!

#2667. If the height of a cone is 6 cm and radius 5 cm, what is its volume?

#2668. Circumference of the edge of a hemispherical bowl is 132 cm. What is its radius?

bobbym · 2011-01-19 06:47:53

Hi ganesh;

Sorry, but I am trying to go a little faster so more calculation errors are likely ( on top of the usual slip ups ) until I get used to the new pace. This does say 10 seconds and I was taking typically about 2 minutes!

Howardroark · 2011-01-19 14:50:43

Hi,

Jai Ganesh · 2011-01-20 00:50:36

Hi bobbym and Howardroark,

The solutions to 2667 and 2668 are perfectly right. Excellent!

I use a simple calculator for calculating. However, I take more than 10 seconds for some solutions.
I shall try to post problems with solutions taking lesser time. I am sorry, for the inconvenience.

#2669. What is the volume of a hemisphere with radius 3 cm?

#2670. What is the total surface area of a cylinder whose radius is

of its height?
(the solution in terms of height and )

bobbym · 2011-01-20 05:17:50

Hi ganesh;

I shall try to post problems with solutions taking lesser time.

Please do not do that. Keep the problems the way you like them. The way they were. I will adjust to the problems. In short, it is my problem!

Howardroark · 2011-01-20 19:38:58

Hi,

Last edited by Howardroark (2011-01-20 19:39:25)

Jai Ganesh · 2011-01-21 00:31:17

Hi bobbym and Howardroark,

The solutions to 2669 and 2670 are correct. Perfect solutions!

#2671. When the volume and surface area of sphere are numerically equal, what is its radius?

#2672. If the base area of a cone is

square cm, what is its radius?

bobbym · 2011-01-21 01:06:48

Hi ganesh;

Jai Ganesh · 2011-01-21 13:54:56

Hi bobbym,

The solutions to 2671 and 2672 are correct. Well done!

#2673. The curved surface area of a cone is 550 square cm. If its radius is 7 cm, find its slant height.

#2674. A sector of radius 20 cm is folded into a one with radius 5 cm, What is its curved surface area?

bobbym · 2011-01-21 15:02:12

Hi ganesh;

Jai Ganesh · 2011-01-22 00:07:03

Hi bobbym,

The solutions to 2673 and 2674 are correct. Neat job!

#2675. What is the slant height of a cone of base radius 8 cm and height 15 cm?

#2676. What is the lateral surface area of a cone whose slant height is is 10 cm and radius 7 cm?

Howardroark · 2011-01-22 01:50:45

Hi ganesh,

bobbym · 2011-01-22 08:04:41

Hi ganesh;

Jai Ganesh · 2011-01-23 01:22:04

Hi Howardroark and bobbym,

The solutions to 2675 and 2676 are correct. Amazing!

#2677. What is the height of a one whose radius is 7 cm and slant height 25 cm?

#2678. What is the volume of a cylinder with base area 70 square cm. and height 6 cm?

bobbym · 2011-01-23 01:52:29

Hi ganesh;

Jai Ganesh · 2011-01-24 00:59:48

Hi bobbym,

The solutions to 2677 and 2678 are correct. Good work!

#2679. Two cylinders have their radii in the ratio 2:3 and heights in the ratio 5:3. What is the ratio of their volumes?

#2680. The base perimeter of a cylinder is 132 cm. What is its radius?
Use

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Math Is Fun Forum

#2026 2011-01-16 00:50:47

Re: 10 second questions

#2027 2011-01-16 01:04:54

Re: 10 second questions

#2028 2011-01-17 00:46:08

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#2029 2011-01-17 01:08:24

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#2030 2011-01-17 02:58:15

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#2031 2011-01-18 00:31:36

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#2032 2011-01-18 06:54:29

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#2033 2011-01-18 14:48:58

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