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#126 2006-10-30 03:01:52

Devantè
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Registered: 2006-07-14
Posts: 6,400

Re: 10 second questions

67. 2*2*2*2*2*3*3*3*3*3
68. Well, I know 6! = 720, so 6! x 7 = 5040

(I knew 7! off by heart, though)

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#127 2006-10-31 03:47:08

ganesh
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Re: 10 second questions

Devante`,
If you meant the prime factors are 2 and 3, you're right.
Your answer isn't clear.
However, for #68, your answer is perfectly correct.
Well done smile


Character is who you are when no one is looking.

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#128 2006-10-31 04:35:45

Devantè
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Re: 10 second questions

Sorry for the unclear answer, I forgot to extend on my answer. In a test, I would've lost a mark for that. :\

Yep, that's what I meant.

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#129 2006-11-03 15:44:06

ganesh
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Re: 10 second questions

69. How many pounds is a kilogram?

70. What is an AU?


Character is who you are when no one is looking.

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#130 2006-11-03 19:46:11

Devantè
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Re: 10 second questions

69. 2.20462262 pounds is a kilogram.
70. AU stands for Astronomical Unit. 1 AU = 149598000 kilometers.

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#131 2006-11-07 02:14:08

ganesh
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Re: 10 second questions

Very well done, Devante`. smile


Character is who you are when no one is looking.

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#132 2006-11-11 10:36:19

Devantè
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Re: 10 second questions

A WikiPedia article on Astronomical Units, if anyone's interested: http://en.wikipedia.org/wiki/Astronomical_unit

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#133 2006-11-15 03:41:04

Toast
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Registered: 2006-10-08
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Re: 10 second questions

Wow... they estimated the distance to the sun with a margin of error of 30 metres!?!
o_o
Doesn't the distance change alot due to gravity?

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#134 2006-11-15 06:14:17

mathsyperson
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Registered: 2005-06-22
Posts: 4,900

Re: 10 second questions

Indeed it does, because our orbit around the sun is slightly elliptical. But their definition of the AU is something like "the radius of an orbit around the sun that would take exactly one year for a complete revolution".

Which is kind of a technical way of saying that it's our average distance from the sun.


Why did the vector cross the road?
It wanted to be normal.

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#135 2006-11-15 23:36:14

hkreddy7
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Registered: 2006-11-13
Posts: 5

Re: 10 second questions

12.  1,000,000,000
(10^9)

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#136 2007-01-06 17:20:34

ganesh
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Re: 10 second questions

71. What is the angular velocity of the minutes hand of the clock in radians per second?

72. What is the significance of the number 746 in physics?

73. And what is the significance of the number 760 in physics?

74. How many prime numbers are there from 1 to 100?

75. And How many prime numbers exist from 1 to 1000?


Character is who you are when no one is looking.

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#137 2007-01-07 02:38:39

mathsyperson
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Registered: 2005-06-22
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Re: 10 second questions

71. π/1800

I have no idea about the others, but I'll guess that there are ~30 primes from 1 to 100 and ~250 from 1 to 1000.


Why did the vector cross the road?
It wanted to be normal.

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#138 2007-01-07 03:46:15

Devantè
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Re: 10 second questions

71) ((pi)/1800)
72) Approximately 746 watts (actually about 745.7) to every horsepower (hp).
73) Originally defined as one one-hundredth of the difference between the freezing and boiling temperatures of water under an atmospheric pressure that balances a 760-mm (29.92-inch) column of mercury.  Now defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
74) 25 primes from 1 to 100
75) 168 primes from 1 to 100

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#139 2007-01-07 14:57:41

Toast
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Registered: 2006-10-08
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Re: 10 second questions

eek Nice job Devante

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#140 2007-01-08 16:04:33

ganesh
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Re: 10 second questions

Excellent, Devante` smile smile smile


Character is who you are when no one is looking.

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#141 2007-01-18 16:43:12

ganesh
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Re: 10 second questions

76) How many seconds are there in a day of 24 hours?

77) If 12 numbers is a dozen, and 144 (12 dozens) is a gross, how many would 12 grosses be?


Character is who you are when no one is looking.

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#142 2007-01-18 19:22:50

Devantè
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Re: 10 second questions

76) 1440 x 60 = 86400
77) 144 x 12 = 1728

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#143 2007-01-19 17:49:07

ganesh
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Re: 10 second questions

Well done, Devante`! I believe you did that within 10 seconds!

78. If 6 men can make 6 tables in 6 days, how many tables can be made by 12 men in 12 days?

79. What is 20 times the value of square root of 2 rounded off to two decimals?

80. How many zeros does a nonillion contain?


Character is who you are when no one is looking.

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#144 2007-01-19 19:41:14

Devantè
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Posts: 6,400

Re: 10 second questions

78. It might be a trick question...maybe 12?
79. 1.41 x 20 = 28.2
80. I think 30 zeros.

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#145 2007-01-19 22:43:48

ganesh
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Registered: 2005-06-28
Posts: 13,176

Re: 10 second questions

78. You are wrong! Interesting!
79. Correct, I guess that was a sitter!
80. You think right, well done!

81. What is the measure of each angle of a regular pentagon?
82. What is 1+2+3+4+...500?
83. If five teams participate in a tournament and each team plays every other team once, how many matches are played in all?


Character is who you are when no one is looking.

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#146 2007-01-19 23:24:39

Toast
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Registered: 2006-10-08
Posts: 1,321

Re: 10 second questions

79. 24
81. (5-2)*180/5 = 108
82. 501*250 = 125250 (sorry took longer than 10 seconds on this one hmm)
83. I believe the formula is

so 10.

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#147 2007-01-20 00:25:00

Devantè
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Registered: 2006-07-14
Posts: 6,400

Re: 10 second questions

82. I remember this question. I did it with 1 to 100 once.
      501x250 = (501x1000)/4 = 125250

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#148 2007-01-20 17:23:44

ganesh
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Registered: 2005-06-28
Posts: 13,176

Re: 10 second questions

Excellent, Toast and Devante`! Well done! Don't mind if it took a second or two more!

84. How many digits does 100! contain?

85. And how many digits does 2^500 contain?


Character is who you are when no one is looking.

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#149 2007-01-21 07:07:19

mathsyperson
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Registered: 2005-06-22
Posts: 4,900

Re: 10 second questions

Depending on where you are, the answer to 80. could also be 54 zeroes.

85. 500/log 2, rounded up. tongue


Why did the vector cross the road?
It wanted to be normal.

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#150 2007-01-21 20:24:55

justlookingforthemoment
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Registered: 2005-05-26
Posts: 2,161

Re: 10 second questions

78.  24 tables.

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