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Mechanics

Cool goIITian

 Joined: 29 Mar 2012 Post: 41
2 Apr 2012 19:11:47 IST
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if a ball is thrown at 80 kmphfrom a train moving at 80 kmph , what will be the velocity of the ball ,

i) when it is thrown in the direction of the train

ii) when it is thrown in the opposite direction

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
2 Apr 2012 19:34:02 IST
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when it is thrown in the dirn of train the velocity will be 160 kmph (RELATIV TO THE GROUND) and if it is thrown in opposite directin velocity is zero(RELATIVE TO GROUND)

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
2 Apr 2012 19:34:37 IST
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hit like if i am correct

Forum Expert
Joined: 23 Jan 2007
Posts: 7958
2 Apr 2012 19:49:49 IST
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When the ball is thrown in the direction of train its velocity will be 80+80 = 160 km/hr. When its thrown in opposite direction its velocity will be 80-80 = 0 km/hr.

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
4 Apr 2012 21:45:05 IST
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@ Tarun........hey but one must consider the frame of referance...........wid respect to train it is 0kmph in the direction of train & it is 160kmph in opp. of train............and wid respct to ground you are correct..........

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
4 Apr 2012 22:29:55 IST
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yeah thats why i am giving it in bracket

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 08:46:01 IST
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@Tarun..........Hey r u interested in IIST?Wow me too!!!!!!!!!!!can u help me in some questions of IIST?

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
5 Apr 2012 10:54:57 IST
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yar uske question to bde fadu hote h

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 10:56:46 IST
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yes you are right.........I,ve seen them......IIT toh kuch bhi nahi hai uske samne.

Hot goIITian

Joined: 11 Mar 2012
Posts: 124
5 Apr 2012 11:02:36 IST
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i)with respect to train it will be 0 kmph

ii) with respect to train it will be 160kmph

Blazing goIITian

Joined: 21 Mar 2012
Posts: 1457
5 Apr 2012 11:05:03 IST
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really yar physics and chemistry are out of this world but maths is relatively easy

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 11:08:08 IST
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yup..........

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 11:09:53 IST
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A ball is dropped down vertically from a tall building. After falling a height h it bounces elasticallyfrom a table inclined at an angle ? and hits a wall at a distance d from the point of earlier impacthorizontally, then

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 11:10:36 IST
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options for this IIST question(A) ? = (1/2) sin?1(2d/h)(B) ? = (1/2) tan?1(d/h)(C) ? = (1/4) sin?1(d/h)(D) ? = (1/2) tan?1(2d/h)

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 11:15:25 IST
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in chemistry they ask more about organic and inorganic and less on physical....

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 11:16:48 IST
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Organic jaise fadu questions toh kidher bhi jyada nahi milte.........................................................................They focus mainly on minute reactions that a student will not consider as important..............

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