 Community Discussion Question:
mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Mar 2008 15:30:54 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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a car is driven at a very high constant speed v ,on a staigt road.this causes lift (L) to act on the car due to airflow.the force of friction (f) acting between the wheels and the road is a-------zero since the car is moving with constan t velcity. b------f=mu mg where m is mass and mu is coffi of static friction c-----f=mu(mg-L) assuming wheel do not loose contact d-----f=d where d is the resultant backward force on the car due to air drag and other contact forces. explain withe reason fast
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22 Mar 2008 15:39:14 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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abe koi to jawaab do
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22 Mar 2008 15:41:29 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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c
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22 Mar 2008 15:43:58 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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i think the answer is D coz the friction is there to oppose the air drag cozed by the air and thus net force becomes zero to make the car move with constant high velocity!!!!
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22 Mar 2008 15:46:19 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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corect mr einstein
thoda sa elaborate karde yaar
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22 Mar 2008 15:46:31 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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c as the fric is given by Normal * the coeff..now the final normal becomes mg-Lso it must be c....let me know whether i am right....
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22 Mar 2008 15:48:46 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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answer is c.....
Normal force becums mg - L
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size doesnt matter, brains do...
vignesh |
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22 Mar 2008 15:52:15 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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friction will not oppose air drag thts impossible for heaven's sake...thts common sense...air drag itself is a kind of friction...there r 2 frictional forces 1 is air drag other is friction from the road..both will oppose rel motion of car...u r changing physics if u say air drag n friction will act in opp directions...
the normal force is affected by lift..so ans is c as i have said previously
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22 Mar 2008 15:54:37 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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Ans is D. Friction doesn't depend on 'weight' (this case reduced by L i.e.W=(mg-L), so C is wrong. Air drag causes additional friction.
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xxxxxxxxxxxxxxx Dylan João Colaço .xxxxxxxxxxxxxx |
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22 Mar 2008 15:56:34 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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dj
friction depends on normal force which is reduced...
air drag is a cause of additional friction only..it will not cause friction bet tyre n road..
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22 Mar 2008 16:00:37 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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are yaar
cpehele mera bhi c aa raha tha
lekin frictional force is a self adjusting force so plz recall that fact
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22 Mar 2008 16:02:38 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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1) talk in eng..not all know hindi
2)so what??isnt it obvious tht a horizontal force air drag never will affect the force on friction????????
friction = N for heaven's sake
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22 Mar 2008 16:03:22 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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sorry computer001, ur rite
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xxxxxxxxxxxxxxx Dylan João Colaço .xxxxxxxxxxxxxx |
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22 Mar 2008 16:04:29 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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wat is the answer i think c is right.....???
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The only place where you will find success before hard work is in the dictionary
A winner never quits.....a quitter never wins......
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22 Mar 2008 16:06:53 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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