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# JEE Free Doubts and Solutions

## A boy use to walk to school every morning & it takes him 20 min. One day on his way, he realise that he had gotten his H.W notebook at home. He knew that if he continued walking to school at the same speed, he would be there 8 min before the bell. So he went back home for the notebook & arrive the school 10 min after the bell. If he walked all the way with his usual speed, then what fraction of the way to school had he covered till the moment he turned back?

Asked by bhavikaguddu32 15th July 2019, 10:07 PM

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## :  Sitting  on  the  banks  of  the  river,  Aladdin  and  his  friends  see  a  group  of  sailors  preparing their  boat  to  sail  south.  Genie  had  never  been  to  the  south  and  this  makes  him  interested  in their  sail  and  he  wants  to  know  where  they  were  heading.  Using  his  magical  powers,  he gathers  everyone  together  and  places  a  magical  hat  on  some  of  the  sailor’s  head  (i.e  at  least one  person  has  a  hat).  The  hat  is  magical  as  it  can  be  seen  by  other  people,  but  not  by  the wearer  of  the  hat  himself.  The  sailors  find  out  about  the  hat  and  in  order  remove  the  hat, those  (  and  only  those  who  have  a  hat)  must  dunk  themselves  underwater  at  exactly  midnight. If  ai  number  of  sailors  dunk  their  hats  on  i-th  day,    find  the  sum  of  ai x  i  for  all  the  days  till  all the  hats  are  removed.  If  there  are  50  men  and  7  hats  find  the  sum.

Asked by abhishekchauhanceo1 14th July 2019, 9:00 PM

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## At what angle should two force vectors 2f and √2f act so that the resultant force is √10f

Asked by rorshack24 14th July 2019, 9:49 AM

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## Q. A light ray is incident on a plane mirror, which after getting reflected strikes another plane mirror, as shown in figure. The angle between the two mirrors is 60°. Find the angle 'θ' shown in figure.

Asked by akku725005 12th July 2019, 9:34 PM

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## A resistor R1 dissipate power P when connected with a ideal generator. When a resistance R2 is put in series, supply voltage remaining same,the power dissipated by R1 is

Asked by sumsansam 8th July 2019, 9:08 PM

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## hi would you plz proide me syllabus for iit jee mains and advance of maths

Asked by srivastavaakash358 7th July 2019, 7:44 PM

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## example for virtual object to form a real image in plane mirror. Light reflected by plane mirror and caught on a screen, is a real image

Asked by mvenkataram 7th July 2019, 9:49 AM

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## Find the turning value of the following functions, distinguishing in each case whether the value is a maximum minimum or inflextional 1. 4x^3 + 19x^2 - 14x +3

Asked by sajithasuresh583 6th July 2019, 1:10 PM

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## three blocks m1=3 kg, m2=2 kg and m3=5 kg lie on an inclined frictionless surface making an angle 30degree with the horizontal. take g=10m/s^2 1)What force parallel to the incline is needed to push the blocks up the plane with an acceleration a=2m/s^2? please answer it fast. 2)find the contact force between (m1 and m2) & (m2 and m3).When the blocks are moving up with an acceleration of 2 m/s^2 up the incline.

Asked by ashu.agrawal2003 5th July 2019, 11:24 PM

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## A CAR TRAVELLS 6KM TOWARDS NORTH AN ANGLE OF 45 DEGREES TO THE EAST AND THEN TRAVELS DISTANCE OF 4 KM TOWARDS NORTH AT AN ANGLE OF 135 DEGREES TO THE EAST.HOW FAR IS THE POINT FROM THE STARTING POINT.WHAT ANGLE DOES THE STRAIGHT LINE JOINING IS INITIAL AND FINAL POSITION MAKES WITH THE EAST

Asked by pulagalarao.137 5th July 2019, 6:06 PM

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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:20 PM

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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:19 PM

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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:18 PM

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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:11 PM

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## Detailed solution for this.

Asked by g_archanasharma 16th December 2018, 6:09 PM

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## Sir pls solve this question.

Asked by rsudipto 15th December 2018, 6:13 PM

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## 2nd and 3rd

Asked by StarBoy 15th December 2018, 2:25 PM

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## Sir in this question how is the inverse fn derived. Pls explain in details.

Asked by rsudipto 15th December 2018, 8:55 AM

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## Sir pls solve this question.

Asked by rsudipto 14th December 2018, 9:52 AM

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## Sir pls solve this question.

Asked by rsudipto 14th December 2018, 9:51 AM