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Author Topic:   Counter-Intuitive Science
New Cat's Eye
Inactive Member


Message 31 of 182 (599852)
01-11-2011 10:33 AM


Cold water holds more hardness than hot water.
Pure water is more corrosive than dirty water.
Edited by Adminnemooseus, : "harness" to "hardness".

  
New Cat's Eye
Inactive Member


Message 40 of 182 (599946)
01-11-2011 5:13 PM
Reply to: Message 37 by Coragyps
01-11-2011 5:01 PM


Though I saw a screenshot off facebook the other day where the poster said that all life on Earth would bake if we orbited ten feet closer to the sun.....
Edited by Catholic Scientist, : No reason given.

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New Cat's Eye
Inactive Member


Message 76 of 182 (600220)
01-13-2011 12:07 PM
Reply to: Message 66 by Dr Adequate
01-12-2011 9:50 PM


Once I was walking towards a set of sliding doors. I noticed them open and close for a group of people walking ahead of me, but when I came to them they wouldn't open. Judging that the sensors weren't sensitive enough to detect my modest weight, I decided to leap vertically in the air in the hope that when I came down the extra force of my impact would open the doors. It did not, and couldn't have done.
Why not?
Because it employed an optical sensor and not a pressure one.

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New Cat's Eye
Inactive Member


Message 77 of 182 (600222)
01-13-2011 12:12 PM
Reply to: Message 75 by frako
01-13-2011 11:50 AM


. If the rope is longer so the marine can put the rope at an angle by walking a few feet away from the grandpa he can lift the grandpa if he is strong enough
Not if he's standing on ice... There's gonna be a horizontal component to the force that the friction between his feet and the ground will have to overcome.

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New Cat's Eye
Inactive Member


Message 83 of 182 (600267)
01-13-2011 5:11 PM
Reply to: Message 82 by ringo
01-13-2011 5:07 PM


Yes, it becomes a complex vector problem with no easy intutitve answers.
Just create a free body diagram in your head

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New Cat's Eye
Inactive Member


Message 87 of 182 (600280)
01-13-2011 5:49 PM
Reply to: Message 84 by ringo
01-13-2011 5:30 PM


Yes, the first step is to recognize that you need to analyze the problem, not just jump to the "obvious" conclusion that the stronger man wins.
I thought the "obvious" conclusion was that the heavier man wins...
The marine *could* lift him if he could walk backwards with the rope and pulled at an angle.

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