10 second questions

bobbym · 2011-01-24 01:07:18

Hi ganesh;

Howardroark · 2011-01-24 02:16:40

Hi ganesh,

Jai Ganesh · 2011-01-25 00:06:01

Hi bobbym and Howardroark,

The solutions to 2679 and 2680 are correct. Magnificent!

#2681. What is the curved surface area of a cylinder whose height equal to radius?

#2682. The surface areas of 2 spheres are in the ratio 16:25. What would the ratio of radii be?

bobbym · 2011-01-25 11:35:02

Hi ganesh;

Howardroark · 2011-01-25 17:04:27

Hi ganesh,

Jai Ganesh · 2011-01-26 00:30:16

Hi bobbym and Howardroark,

The solutions to 2681 and 2682 are perfect. Brilliant!

#2683. A cone and a cylinder have same radii and same curved surface area. If the height of cylinder is 5 cm, what would the slant height be?

#2684. If the radius of the cone is same as its height and equal to 'a', then what would slant height be?

dolgopolov · 2011-01-26 01:09:15

how i can do this in 10 seconds? its nice problems but i am too slow..

bobbym · 2011-01-26 01:20:47

Hi ganesh;

Jai Ganesh · 2011-01-26 01:51:53

Hi bobbym and dolgopolov,

The solutions to 2683 and 2684 are correct. Stupendous!

#2685. The ratio of surface areas of two spheres are 1:64. What is the ratio of their radii?

dolgopolov : Hi dolgopolov,

Try to solve the problems as fast as you can. Don't worry, if the problems take longer. Keep trying.

Best wishes!

bobbym · 2011-01-26 01:56:30

Hi ganesh;

Howardroark · 2011-01-26 02:05:29

Hi ganesh,

Last edited by Howardroark (2011-01-26 02:06:11)

Jai Ganesh · 2011-01-27 00:38:25

Hi bobbym and Howardroark,

The solutions to 2683, 2684, and 2685 are correct. Magnificent!

#2686. The volume of a cone is __________ times to that of a cylinder of same radius and height.

#2687. A cylinderical tank has a capacity of 6160 cubic meters. Diameter of base is 28 meters. Then,
what is its depth? (use

bobbym · 2011-01-27 01:18:50

Hi ganesh;

Jai Ganesh · 2011-01-28 00:08:05

Hi bobbym,

The solutions to 2686 and 2687 are correct. Excellent!

#2688. The area of a cylinder is 100 square cm. and its height is 12 cm. What is the volume of the cylinder?

#2689. Area of the base of a right circular cylinder is 40 square cm. and its height is 10 cm. What is its volume?

bobbym · 2011-01-28 00:41:04

Hi ganesh;

On #2688

The area of a cylinder is 100 square cm.

Do you mean total surface area or curved surface area?

Jai Ganesh · 2011-01-29 00:47:59

Hi bobbym,

The problem to 2688: The problem is intended to the base area of a cylinder and height given, to find volume.

The solution to 2689 is perfect. Well done!

#2690. Find the total surface area of a solid cylinder with base area 25

square cm. and curved surface area is 100 square cm.

#2691. The heights of two cylinders of congruent bases are in the ratio 3:2. What would the ratio of their volumes?

bobbym · 2011-01-29 01:45:10

Hi ganesh;

Thanks for explanation on #2688.

Jai Ganesh · 2011-01-30 00:27:14

Hi bobbym,

The solutions to 2688, 2690, and 2691 are correct. Fabulous!

#2692. The sum of external and internal radii is 14 cm. and the width is 4 cm.If its height is 20 cm. then what is the volume of material in it?
(in terms of

)

#2693. Two cones have their radii in the ratio 3:2 and their vertical heights in the ratio 2:3, what is the ratio of their volumes?

bobbym · 2011-01-30 01:09:17

Hi ganesh;

Jai Ganesh · 2011-01-31 00:22:19

Hi bobbym,

The solutions to 2692 and 2693 are correct. Brilliant!

#2694. The radii of two cylinders are in the ratio 3:2 and their heights are in ratio 5:3. What is the ratio of their volumes?

#2695. The circumference of the base of a right circular cylinder is 80 cm. Its height is 5 cm. What is its lateral surface area?

bobbym · 2011-01-31 01:16:45

Hi;

Jai Ganesh · 2011-02-01 00:06:41

Hi bobbym,

The solutions to 2694 and 2695 are correct. Good work!

#2696. Radius of a cylinder is 21 cm. and height is 10 cm. What is the curved surface area of the cylinder?
(use

)

#2697. The circumference of the base of a cylinder is 64 cm. and height is 4 cm. What is its curved surface area?

bobbym · 2011-02-01 00:21:38

Hi ganesh;

Howardroark · 2011-02-01 05:35:35

Hi Ganesh,

Jai Ganesh · 2011-02-02 01:10:44

Hi bobbym and Howardroark,

The solutions to 2696 and 2697 are perfect. Brilliant!

#2698. What is the height of a cone whose slant height and base diameter are 13 cm. and 10 cm. respectively?

#2699. Volume of a cone is 15 cubic cm. Then, what is the volume of a cylinder with the same radius and height?

Math Is Fun Forum

#2051 2011-01-24 01:07:18

Re: 10 second questions

#2052 2011-01-24 02:16:40

Re: 10 second questions

#2053 2011-01-25 00:06:01

Re: 10 second questions

#2054 2011-01-25 11:35:02

Re: 10 second questions

#2055 2011-01-25 17:04:27

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#2056 2011-01-26 00:30:16

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#2057 2011-01-26 01:09:15

Re: 10 second questions

#2058 2011-01-26 01:20:47

Re: 10 second questions

#2059 2011-01-26 01:51:53

Re: 10 second questions

#2060 2011-01-26 01:56:30

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#2061 2011-01-26 02:05:29

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#2062 2011-01-27 00:38:25

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#2064 2011-01-28 00:08:05

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#2066 2011-01-29 00:47:59

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