10 second questions

Devantè · 2006-10-30 03:01:52

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)

Jai Ganesh · 2006-10-31 03:47:08

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

Devantè · 2006-10-31 04:35:45

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.

Jai Ganesh · 2006-11-03 15:44:06

69. How many pounds is a kilogram?

70. What is an AU?

Devantè · 2006-11-03 19:46:11

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

Jai Ganesh · 2006-11-07 02:14:08

Very well done, Devante`.

Devantè · 2006-11-11 10:36:19

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

Toast · 2006-11-15 03:41:04

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?

mathsyperson · 2006-11-15 06:14:17

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.

hkreddy7 · 2006-11-15 23:36:14

12. 1,000,000,000
(10^9)

Jai Ganesh · 2007-01-06 17:20:34

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?

mathsyperson · 2007-01-07 02:38:39

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.

Devantè · 2007-01-07 03:46:15

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

Toast · 2007-01-07 14:57:41

Nice job Devante

Jai Ganesh · 2007-01-08 16:04:33

Excellent, Devante`

Jai Ganesh · 2007-01-18 16:43:12

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?

Devantè · 2007-01-18 19:22:50

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

Jai Ganesh · 2007-01-19 17:49:07

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?

Devantè · 2007-01-19 19:41:14

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

Jai Ganesh · 2007-01-19 22:43:48

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?

Toast · 2007-01-19 23:24:39

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

so 10.

Devantè · 2007-01-20 00:25:00

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

Jai Ganesh · 2007-01-20 17:23:44

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?

mathsyperson · 2007-01-21 07:07:19

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

85. 500/log 2, rounded up.

justlookingforthemoment · 2007-01-21 20:24:55

78. 24 tables.

Math Is Fun Forum

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

Re: 10 second questions

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

Re: 10 second questions

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

Re: 10 second questions

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

Re: 10 second questions

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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