{"id":582,"date":"2019-08-14T16:31:50","date_gmt":"2019-08-14T11:01:50","guid":{"rendered":"https:\/\/www.physicsacademyonline.com\/blog\/?p=582"},"modified":"2021-02-25T14:01:06","modified_gmt":"2021-02-25T08:31:06","slug":"how-to-solve-neet-2018-with-a-smile-iii-2","status":"publish","type":"post","link":"https:\/\/www.physicsacademyonline.com\/blog\/neet-2018\/how-to-solve-neet-2018-with-a-smile-iii-2.html","title":{"rendered":"How To Solve NEET 2018 With A Smile &#8211; III"},"content":{"rendered":"<h3 style=\"font-size: 1.20em; font-weight: normal !important;\"><i>Let <em><del>Us<\/del> <\/em><\/i><span style=\"font-family: impact; letter-spacing: 1.5px; font-size: 24px; color: #000;\">YOU<\/span><i> Solve NEET 2018<br \/>\n<\/i><\/h3>\n<p>Carrying forward from the previous blog, we shall encourage our readers to attempt more Physics questions from the latest National Eligibility cum Entrance Test (NEET), held on 06 May 2018. This is the premier Medical Entrance Examination in India, taken by nearly 13 lakh students for about 66,000 MBBS and BDS seats in government and private colleges. Readers of this blog, who are +2 students and potential candidates for the exam in near future, can solve the questions <em>on their own<\/em> with little hint from us. Every question is linked to one or more theories of Physics, which can be readily accessed through video lectures @ <a href=\"https:\/\/www.physicsacademyonline.com\" target=\"_blank\" rel=\"noopener\">PhysicsAcademyOnline.com.<\/a> Discussion on every question is accompanied by a video solution, to be consulted <em>only after <\/em>you solve yourself.<\/p>\n<p><strong><u>Question 162<\/u>:\u00a0<\/strong> A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure)\u00a0<span style=\"color: #0cc70c;\">\u00a0<\/span> just completes a vertical circle of diameter AB = D. The height h is equal to:<\/p>\n<p><a href=\"https:\/\/www.physicsacademyonline.com\/blog\/wp-content\/uploads\/2019\/08\/Blog20_Img.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-699\" src=\"https:\/\/www.physicsacademyonline.com\/blog\/wp-content\/uploads\/2019\/08\/Blog20_Img.png\" alt=\"\" width=\"334\" height=\"206\" srcset=\"https:\/\/www.physicsacademyonline.com\/blog\/wp-content\/uploads\/2019\/08\/Blog20_Img.png 334w, https:\/\/www.physicsacademyonline.com\/blog\/wp-content\/uploads\/2019\/08\/Blog20_Img-300x185.png 300w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/><\/a><\/p>\n<p>(1) 3D\/2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0 \u00a0 (2) 5D\/4\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0 (3) 7D\/5\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4) D<\/p>\n<p>What is the speed attained by the body as it reaches the bottom of the track (point A)? To apply &#8220;energy method&#8221;, study the following lecture: <em><span style=\"color: #8270a4;\">Chapter Name \u2013 Mechanics; Category \u2013\u00a0 Basic; Topic Name \u2013 Work and Energy; Video Name \u2013 Principle of Conservation of Mechanical Energy, and Some Applications.<\/span><\/em><\/p>\n<p>What is the minimum speed required by the body to <em>just<\/em> complete the vertical circle? Follow the discussion here: <em><span style=\"color: #8270a4;\">Chapter Name \u2013 Mechanics; Category \u2013\u00a0 Basic; Topic Name \u2013 Circular Motion; Video Name \u2013 Examples of Non-Uniform Circular Motion.<\/span><\/em><\/p>\n<p>Get the relation between h and D.<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" width=\"740\" height=\"416\" src=\"https:\/\/www.youtube.com\/embed\/ZThpFzXEqp0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p><strong><u>Question 163<\/u>:<\/strong>\u00a0 Three objects \u2013 A (a solid sphere), B (a thin circular disc) and C (a circular ring) \u2013 have the same mass M and radius R each. They all spin with the same angular speed <em>\u03c9<\/em> about their respective axes of symmetry. The amounts of work, W, required to bring them to rest would satisfy the relation:<\/p>\n<p>(1) W<sub>C<\/sub> &gt; W<sub>B<\/sub> &gt; W<sub>A<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2) W<sub>A<\/sub> &gt; W<sub>C<\/sub> &gt; W<sub>B<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (3) W<sub>B<\/sub> &gt; W<sub>A<\/sub> &gt; W<sub>C<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4) W<sub>A<\/sub> &gt; W<sub>B<\/sub> &gt; W<sub>C<\/sub><\/p>\n<p>What is the general formula for rotational kinetic energy of a body? If you already haven&#8217;t, follow the lecture: <em><span style=\"color: #8270a4;\">Chapter Name \u2013 Mechanics; Category \u2013\u00a0 Basic; Topic Name \u2013 Rotational Mechanics; Video Name \u2013 Rotational Kinetic Energy, and Comparison between Translation and Rotation.<\/span><\/em><\/p>\n<p>What are the moments of inertia about centre of mass of a solid sphere, a disc and a ring? If you need to brush up, derived here: <em><span style=\"color: #8270a4;\">Chapter Name \u2013 Mechanics; Category \u2013\u00a0 Basic; Topic Name \u2013 Rotational Mechanics; Video Names \u2013 &#8220;Moment of Inertia, and Its Calculation for Various Bodies&#8221; &amp; &#8220;Calculation of Moments of Inertia for Various Bodies II&#8221;.<\/span><\/em><\/p>\n<p>What is the rotational analogue of the work-energy theorem? Study the original theorem here: <em><span style=\"color: #8270a4;\">Chapter Name \u2013 Mechanics; Category \u2013\u00a0 Basic; Topic Name \u2013 Work and Energy; Video Name \u2013 Concept of Energy, and Derivation of Work-Energy Theorem.<\/span><\/em><\/p>\n<p>Compare the <em>absolute values<\/em> of the work for three objects.<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" width=\"740\" height=\"416\" src=\"https:\/\/www.youtube.com\/embed\/BGqwe1Y4uRk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p><strong><u>Question 164<\/u>:<\/strong>\u00a0 Which one of the following statements is incorrect?:<\/p>\n<p>(1) Rolling friction is smaller than sliding friction.<\/p>\n<p>(2) Coefficient of sliding friction has dimensions of length.<\/p>\n<p>(3) Frictional force opposes the relative motion.<\/p>\n<p>(4) Limiting value of static friction is directly proportional to normal force.<\/p>\n<p>A question purely based on the theory of Friction. And you can learn it from: <em><span style=\"color: #8270a4;\"> Chapter Name \u2013 Mechanics; Category \u2013\u00a0 Basic; Topic Name \u2013 Friction; Video Names \u2013 &#8220;Static and Kinetic Friction&#8221; &amp; &#8220;Rolling Friction&#8221;.<\/span><\/em><\/p>\n<p>Now, picking the incorrect option is as easy as picking an apple from a tray of oranges!<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" width=\"740\" height=\"416\" src=\"https:\/\/www.youtube.com\/embed\/5BeZwz5bzdg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p><strong><u>Question 165<\/u>:<\/strong>\u00a0 A block of mass m, moving with velocity v, collides with another stationary block of mass 4m and comes to rest. The value of coefficient of restitution, e, is:<\/p>\n<p>(1) 0.5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0 (2) 0.4 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (3) 0.8\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (4) 0.25<\/p>\n<p>When two blocks collide head-on, which physical quantity remains conserved? Follow the lecture: <span style=\"color: #8270a4;\">\u00a0 <em>Chapter Name \u2013 Mechanics; Category \u2013\u00a0 Basic; Topic Name \u2013 Impulse, Collision, and Centre of Mass; Video Name \u2013 Mathematical Study of One-Dimensional Collision.<\/em><\/span><\/p>\n<p>Find the velocity of the heavier block after collision. What is coefficient of restitution for a collision? Defined in the same lecture mentioned above.<\/p>\n<p>Calculate the coefficient.<\/p>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" width=\"740\" height=\"416\" src=\"https:\/\/www.youtube.com\/embed\/O_djyOyXUHE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Let Us YOU Solve NEET 2018 Carrying forward from the previous blog, we shall encourage our readers to attempt more Physics questions from the latest National Eligibility cum Entrance Test&#8230;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"_links":{"self":[{"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/posts\/582"}],"collection":[{"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/comments?post=582"}],"version-history":[{"count":9,"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/posts\/582\/revisions"}],"predecessor-version":[{"id":701,"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/posts\/582\/revisions\/701"}],"wp:attachment":[{"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/media?parent=582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/categories?post=582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.physicsacademyonline.com\/blog\/wp-json\/wp\/v2\/tags?post=582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}