JEE Advanced · Physics · 7. COM & Collisions
A bar of mass and length is lying on a horizontal frictionless surface. One end of the bar is pivoted at a point about which it is free to rotate. A small mass is moving on the same horizontal surface with speed on a path perpendicular to the bar. It hits the bar at a distance from the pivoted end and returns back on the same path with speed . After this elastic collision, the bar rotates with an angular velocity . Which of the following statement is correct?
- A and
- B and
- C and
- D and
Answer & Solution
Correct Answer
(A) and
Step-by-step Solution
Detailed explanation
Before: After:
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- Light of wavelength falls on a cathode plate inside a vacuum tube as shown in the figure. The work function of the cathode surface is and the anode is a wire mesh of conducting material kept at a distance d from the cathode. A potential difference V is maintained between the electrodes. If the minimum de Broglie wavelength of the electrons passing through the anode is which of the following statement(s) is(are) true ?
JEE Advanced 2016 Medium - System shown in figure is in equilibrium and at rest. The spring and string are massless, now the string is cut. The acceleration of mass \(2 m\) and \(m\) just after the string is cut will be
JEE Advanced 2006 Medium - Four solid spheres each of diameter \(\sqrt{5} \mathrm{~cm}\) and mass \(0.5 \mathrm{~kg}\) ar placed with their centres at the corners of a square of side \(4 \mathrm{~cm}\). The moment of inertia of the system about the diagonal of the square is \(N \times 10^{-4} \mathrm{~kg}-\mathrm{m}^2\), then \(N\) isJEE Advanced 2011 Medium
- An infinitely long thin non-conducting wire is parallel to the z - axis and carries a uniform line charge density . It pierces a thin non-conducting spherical shell of radius in such a way that the arc subtends an angle at the centre of the spherical shell, as shown in the figure. The permittivity of free space is . Which of the following statements is (are) true?
JEE Advanced 2018 Medium - A horizontal forceis applied at the centre of mass of a cylindrical object of massand radius, perpendicular to its axis as shown in the figure. The coefficient of friction between the object and the ground is. The centre of mass of the object has an acceleration. The acceleration due to gravity is. Given that the object rolls without slipping, which of the following statement(s) is (are) correct?
JEE Advanced 2021 Hard - Match the following for the given process

JEE Advanced 2006 Medium
More PYQs from JEE Advanced
- For the following compounds the correct statement(s) with respect to nucleophilic substitution reactions is(are)
JEE Advanced 2017 Medium - Paragraph:
Upon heating \(\mathrm{KClO}_{3}\) in the presence of catalytic amount of \(\mathrm{MnO}_{2}\), a gas \(\mathbf{W}\) is formed. Excess amount of \(\mathbf{W}\) reacts with white phosphorus to give \(\mathbf{X}\). The reaction of \(\mathbf{X}\) with pure \(\mathrm{HNO}_{3}\) gives \(\mathbf{Y}\) and \(\mathbf{Z}\).
Question:
\(\mathbf{Y}\) and \(\mathbf{Z}\) are, respectivelyJEE Advanced 2017 Medium - For any , let and . Then the sum of all the solutions of the equation for , is equal toJEE Advanced 2023 Medium
- \(\mathrm{CuSO}_4\) decolourises on addition of \(\mathrm{KCN}\), the product isJEE Advanced 2006 Medium
- Let \(\mathbb{R}\) denote the set of all real numbers. Let \(f: \mathbb{R} \rightarrow \mathbb{R}\) be a function such that \(f(x)>0\) for all \(x \in \mathbb{R}\), and \(f(x+y)=f(x) f(y)\) for all \(x, y \in \mathbb{R}\).
Let the real numbers \(\mathrm{a}_1, \mathrm{a}_2 \ldots, \mathrm{a}_{50}\) be in an arithmetic progression. If \(f\left(\mathrm{a}_{31}\right)=64 f\left(\mathrm{a}_{25}\right)\), and \(\sum_{i=1}^{50} f\left(a_i\right)=3\left(2^{25}+1\right)\) then the value of \(\sum_{i=6}^{30} f\left(a_i\right)\) is ________JEE Advanced 2025 Easy - Let \(f:\left[0, \frac{\pi}{2}\right] \rightarrow[0,1]\) be the function defined by \(f(x)=\sin ^2 x\) and let \(g:\left[0, \frac{\pi}{2}\right] \rightarrow[0, \infty)\) be the function defined by \(g(x)=\sqrt{\frac{\pi x}{2}-x^2}\).
The value of \(\frac{16}{\pi^3} \int_0^{\frac{\pi}{2}} f(x) g(x) d x\) isJEE Advanced 2024 Medium