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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Jul 2007 17:08:06 IST
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A projectile crosses half its maximum height at a certain instant of time and again 10s later. calculate the maximum height. If the angle of projection is 30degrees, calculate the maximum range of the projectile as well as the horizontal distance it travelled in the above 10s. regards sreenivas
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26 Jul 2007 08:49:03 IST
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Let initial velocity of particle be u. Its two components are
ux = 0.866u
uy=0.5u
vertical velocity of particle at half the maximum = uy/sqrt(2)
vertical velocity of particle when it again reaches half the maximum = -uy/sqrt(2)
It happens in 10 sec Applying v = u+at in this period
sqrt(2)uy = 10g
Taking g = 10
uy = 50sqrt(2) or u = 100sqrt(2)
MAx range = u^2/2g = 1000 m
Horizontal distance in those 10 sec = ux*10 =sqrt(3/2)*1000
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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30 Jul 2007 16:41:18 IST
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hey.....guys will any1 help me with dis prob?/ it is as follows........ Why does an egg float in salt water when it sinks in drinkin or normal water???/ waiting 4 d answer n gemme d logical answer..... plzzzzzz......reply
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30 Jul 2007 16:47:38 IST
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bcoz, 1) density of salt water is more than that of normal water.... 2) due to upthrust..... i.e acc. to archimedes principle.... hpoin ot clears ur doubt !!!
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You cannot control circumstances.....
But you can control thinking over them...... |
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4 Aug 2007 17:34:06 IST
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go to cmd(dos prompt)
then type "config/all"(without quoats)
then se the ip address
please tellme??
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There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.
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8 Aug 2007 16:14:02 IST
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1) WHy does a red rose appear red?(is it due to light) & also 2) Why can a mosquito float on water whereas a pin of same mass and size as the mosquito sinks inside the water? XPECTED SCIENTIFICALLY
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8 Aug 2007 17:24:55 IST
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1) an object appears to be of a certain colour because it has a certain pigment which reflects that colour and absorbs light of all other wavelengths when white light falls on it
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---------------------------------------------------------------
* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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8 Aug 2007 17:29:32 IST
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2) is due to surface tension of water... and also even a pin can be made to float if u do it slowly and carefully enough..
a mosquito floats and a pin generally sinks as the pressure exerted by the latter is more as it has comparitively less surface area for contact. pressure is inversely proportional to area of contact.
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---------------------------------------------------------------
* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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