tag:blogger.com,1999:blog-2214461049219354662.post3428696092365908278..comments2024-03-28T13:08:35.581+04:00Comments on Physics Reference: Physics 9702 Doubts | Help Page 149Unknownnoreply@blogger.comBlogger11125tag:blogger.com,1999:blog-2214461049219354662.post-73702643440786115952020-04-20T22:21:13.767+04:002020-04-20T22:21:13.767+04:00go to
http://physics-ref.blogspot.com/2020/04/mono...go to<br />http://physics-ref.blogspot.com/2020/04/monochromatic-light-of-wavelength-is.htmlAdminhttps://www.blogger.com/profile/03708185681043991662noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-88491127150763745042020-04-20T13:48:55.606+04:002020-04-20T13:48:55.606+04:00Sir, have you solved this question before?
9702/13...Sir, have you solved this question before?<br />9702/13/M/J/17 question 28<br />Thank you.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-74895834639785626632015-05-24T21:05:06.495+04:002015-05-24T21:05:06.495+04:00Actually in this question, we should not be thinki...Actually in this question, we should not be thinking of the forces in terms of weight and air resistance.<br /><br />This question is mostly on Newton's laws of motion. From the third law itself, choice B is correct.<br /><br />Now, from Newton's 2nd law of motion, the force is equal to the rate of change of momentum. Remember, the ball is falling - so it has some velocity. When it hits the ground, its speed is momentarily zero. So, there is a change in velocity. <br />Momentum = mv. Since velocity changes, momentum also changes, thus giving rise to a force (Newton's 2nd law).<br /><br />Since the way the velocity changes is different at different stages, the FORCE we are talking about differs from the weight.Adminhttps://www.blogger.com/profile/03708185681043991662noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-35643257375624376722015-05-24T06:05:06.232+04:002015-05-24T06:05:06.232+04:00Salam! in q 738, when the ball is about to move up...Salam! in q 738, when the ball is about to move upwards, the force exerted by the ground on it is upward n greater than its weight which is why it accelerates upwards ryt?<br />for option A, this is what i think, let me know if this is wrong.<br />1. In absence of air resistance if the ball fallas and hits the ground, the force it exerts on the ground will be equal to its weight. (and if not, how can the ball not exert W because that is the force with which it fell, right?)<br />2. but if air resistance is appreciable, then the ball would exert force on the ground equal to the resultant of its W and resistive force.<br />Is this why A and D are both wrong?<br />qdkhanhttps://www.blogger.com/profile/18294886518542671162noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-46816984910050973662015-05-23T20:40:23.259+04:002015-05-23T20:40:23.259+04:00Check solution 619 at
http://physics-ref.blogspot....Check solution 619 at<br />http://physics-ref.blogspot.com/2015/04/physics-9702-doubts-help-page-122.htmlAdminhttps://www.blogger.com/profile/03708185681043991662noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-54962655458626855122015-05-23T20:29:59.797+04:002015-05-23T20:29:59.797+04:00Check solution 743 at
http://physics-ref.blogspot....Check solution 743 at<br />http://physics-ref.blogspot.com/2015/05/physics-9702-doubts-help-page-150.htmlAdminhttps://www.blogger.com/profile/03708185681043991662noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-58094616840000680192015-05-23T19:17:40.504+04:002015-05-23T19:17:40.504+04:00Oct/Nov 2014 P41 Q5 b (i) & (ii) partOct/Nov 2014 P41 Q5 b (i) & (ii) partAnonymoushttps://www.blogger.com/profile/14831828028658394415noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-37398358343949926192015-05-23T19:17:02.839+04:002015-05-23T19:17:02.839+04:00Oct/Nov 2014 P41 Q5 b i & ii partOct/Nov 2014 P41 Q5 b i & ii partAnonymoushttps://www.blogger.com/profile/14831828028658394415noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-80080612980994085752015-05-23T16:23:14.976+04:002015-05-23T16:23:14.976+04:00M/J/08 Q.26 paper12M/J/08 Q.26 paper12Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-82277460087669475242015-05-23T14:35:20.265+04:002015-05-23T14:35:20.265+04:00For 11/M/J/11 Q.25, see solution 129 at
http://phy...For 11/M/J/11 Q.25, see solution 129 at<br />http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-24.htmlAdminhttps://www.blogger.com/profile/03708185681043991662noreply@blogger.comtag:blogger.com,1999:blog-2214461049219354662.post-42532460223007795192015-05-23T11:49:56.508+04:002015-05-23T11:49:56.508+04:0011/M/J/11 Q.25,27,3211/M/J/11 Q.25,27,32Anonymoushttps://www.blogger.com/profile/11459103661460827376noreply@blogger.com