# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #26 2015-11-03 10:52:17

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 31 is correct! Excellent!

II 33. The Sun is a G-type main-sequence star that comprises about 99.86% of the mass of the Solar System. What is its absolute magnitude, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs?

II 34. The Sun is by far the brightest object in the sky, with an apparent magnitude of -26.74. How many times is it times brighter than the next brightest star, Sirius, which has an apparent magnitude of -1.46?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #27 2015-11-04 05:02:38

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #28 2015-11-04 22:45:28

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

II 35. What is the escape velocity on Sun?

II 36. What is the surface area of Sun (in square kilometers)?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #29 2015-11-06 16:33:49

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #30 2015-11-06 17:52:37

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 35 is correct! Neat work!

II 37. What is the volume of the Pacific Ocean, representing about 50.1 percent of the world's oceanic water,  in cubic kilometers been estimated at?

II 38.  Give the area of Atlantic Ocean,  the second largest of the world's oceanic divisions, following the Pacific Ocean in square kilometers or square miles. (It covers approximately 20 percent of the Earth's surface and about 29 percent of its water surface area). The first part of its name refers to Atlas of Greek mythology, making the Atlantic the "Sea of Atlas".

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #31 2015-11-07 18:10:12

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #32 2015-11-07 20:00:04

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 38 is perfect! Brilliant, bobbym!

II 39.  It the third-largest island in the world and the largest island in Asia. At the geographic center of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and east of Sumatra. The island is divided among three countries: Malaysia and Brunei in the north, and Indonesia to the south. Name the island.

II 40. Name the five most populous cities in New Zealand.

II 41. Name the four major islands of Japan.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #33 2015-11-09 18:40:13

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #34 2015-11-09 20:54:09

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 39 is correct! Good work!

The Answers II 40 (partially correct) and II 41 (50% correct) are right! Well done!

II 42.  Libya  is a country in the Maghreb region of North Africa bordered by the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast, Chad and Niger to the south, and Algeria and Tunisia to the west. Give the approximate land area of Libya in square kilometers or square miles.

II 43. Kenya, officially the Republic of Kenya, is a country in Africa and a founding member of the East African Community (EAC). Its capital and largest city is Nairobi. Kenya's territory lies on the equator and overlies the East African Rift covering a diverse and expansive terrain that extends roughly from Lake Victoria to Lake Turkana (formerly called Lake Rudolph) and further south-east to the Indian Ocean.  It is bordered by Tanzania to the south, Uganda to the west, South Sudan to the north-west, Ethiopia to the north and Somalia to the north-east. Give the approximate area of Kenya in square kilometers or square miles.

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #35 2015-11-10 12:23:53

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #36 2015-11-10 13:17:10

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 42 is correct! Good work!

II 44. Name the third highest mountain in the world, and lies partly in Nepal and partly in Sikkim, India. (an elevation of 8,586 m (28,169 ft)).

II 45.  Name the mountain located on Honshu Island, is the highest mountain in Japan at 3,776.24 m (12,389 ft).

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #37 2015-11-19 19:41:45

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #38 2015-11-19 22:12:39

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 45 is correct! Good work!

II 46. The hydrosphere in physical geography describes the combined mass of water found on, under, and over the surface of a planet. Igor Shiklomanov, the man selected by the United Nations to do its world inventory of water resources estimated.  How many million cubic kilometres of water on Earth is present?  (This includes water in liquid and frozen forms in groundwater, glaciers, oceans, lakes and streams. Saltwater accounts for 97.5% of this amount. Fresh water accounts for only 2.5%. Of this fresh water 68.7% is in the "form of ice and permanent snow cover in the Arctic, the Antarctic, and in the mountainous regions.")

II 47. What is the average salinity  of the Earth's oceans in grams of salt per kilogram of sea water?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #39 2015-12-09 18:30:19

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #40 2015-12-11 14:47:02

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

Good attempt (II 47), bobbym!

II 48.  Approximately how much of the Earth's surface, an area of some 361 million square kilometers (139.5 million square miles), is covered by ocean?

II 49.  Approximately, how much percent of the total amount of fresh waters on planet Earth is easily accessible? (It is found in lakes, reservoirs and river systems, the principal elements of water ecosystems.)

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #41 2015-12-11 15:44:08

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #42 2015-12-11 18:25:32

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

II 48 is close. Good attempt!

II 50. The Amazon basin is the largest drainage basin in the world. What is its area approximately? (It accounts for roughly one-fifth of the world's total river flow. The portion of the river's drainage basin in Brazil alone is larger than any other river's basin. The Amazon enters Brazil with only one-fifth of the flow it finally discharges into the Atlantic Ocean, yet already has a greater flow at this point than the discharge of any other river.)

II 51. Angel Falls (meaning "waterfall of the deepest place", or Parakupá Vená, meaning "the fall from the highest point") is a waterfall in Venezuela. It is the world's highest uninterrupted waterfall. Give the height in metres (or feet) and a plunge in metres (or feet).

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #43 2015-12-12 07:09:14

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #44 2015-12-12 17:46:59

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 51 is close. Good work!

II 52. The Danube is Europe's second-longest river, after the Volga River, and also the longest river in the European Union region. It is located in Central and Eastern Europe. The Danube was once a long-standing frontier of the Roman Empire, and today flows through 10 countries. Originating in Germany, the Danube flows southeast for how many kilometers or miles, passing through or touching the border of Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine before emptying into the Black Sea? (Its drainage basin extends into nine more countries.)

II 53. The Rhine is a European river that begins in the Swiss canton of Graubünden in the southeastern Swiss Alps, forms part of the Swiss-Austrian, Swiss-Liechtenstein border, Swiss-German and then the Franco-German border, then flows through the Rhineland and eventually empties into the North Sea in the Netherlands. It is the second-longest river in Central and Western Europe (after the Danube). What is the approximate length of the river (in kilometers or miles)?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #45 2015-12-13 04:42:06

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #46 2015-12-13 12:23:43

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

The Answer II 53 is correct! Neat work!

II 54. K2, also known as Chhogori/Qogir, Ketu/Kechu, and Mount Godwin-Austen  is the second highest mountain in the world after Mount Everest. What is its height above sea level in meters/feet?

II 55. Name the geographical site - It is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #47 2015-12-16 18:44:53

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #48 2015-12-17 01:31:12

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

II 55 (The Grand Canyon) is correct! Excellent!

II 56. The Andromeda Galaxy, also known as Messier 31, M31, or NGC 224, is a spiral galaxy approximately 780 kiloparsecs (2.5 million light-years) from Earth. It is the nearest major galaxy to the Milky Way and was often referred to as the Great Andromeda Nebula in older texts. It received its name from the area of the sky in which it appears, the constellation of Andromeda, which was named after the mythological princess Andromeda. Being approximately 220,000 light years across, it is the largest galaxy of the Local Group, which also contains the Milky Way, the Triangulum Galaxy, and about 44 other smaller galaxies.
How many Solar Masses is Andromeda Galaxy  estimated to be?

II 57. The Milky Way is the second-largest galaxy in the Local Group, with its stellar disk approximately 100,000 ly (30 kpc) in diameter, and, on average, approximately 1,000 ly (0.3 kpc) thick. As a guide to the relative physical scale of the Milky Way, if the Solar System out to Neptune were the size of a US quarter (25mm), the Milky Way would be approximately the size of the United States. A ring-like filament of stars wrapping around the Milky Way may actually belong to the Milky Way itself, rippling above and below the relatively flat galactic plane. If so, that would mean a diameter of 150,000–180,000 light-years (46–55 kpc).
Estimates of the mass of the Milky Way vary, depending upon the method and data used. At the low end of the estimate range, the mass of the Milky Way is approximately how  many solar masses (M☉) is it?  (somewhat less than that of the Andromeda Galaxy)

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

## #49 2015-12-18 15:22:11

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Interesting Information.....

Hi;

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

## #50 2015-12-18 18:39:59

Jai Ganesh
Registered: 2005-06-28
Posts: 47,414

### Re: Interesting Information.....

Hi bobbym,

II 57 is correct! Excellent!

II 58. What is the approximate 'Number of stars' in the Milky Way?

II 59. What is the Sun's distance to Galactic Center?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline