Physics · 2019
JEE Main · 12 January 2019, Shift 1 · Q4
A simple pendulum, made of a string of length l and a bob of mass m, is released from a small angle θ_0. It strikes a block of mass M, kept on a…
A simple pendulum, made of a string of length $\displaystyle l$ and a bob of mass m, is released from a small angle $\displaystyle \theta_0$. It strikes a block of mass M, kept on a horizontal surface at its lowest point of oscillations, elastically. It bounces back and goes up to an angle $\displaystyle \theta_1$. Then M is given by :
Official answer
(3)
$\displaystyle \mathrm{m}\left(\frac{\theta_0+\theta_1}{\theta_0-\theta_1}\right)$
More from Centre of Mass and Collisions
- Three blocks A, B and C are lying on a smooth horizontal surface, as shown in the figure. A and B have equal masses, m while C has mass M. Block A is…2019
- Consider a circular disc of radius 20 cm with centre located at the origin. A circular hole of radius 5 cm is cut from this disc in such a way that…2025
- A square shaped hole of side l=a/2 is carved out at a distance d=a/2 from the centre ' O ' of a uniform circular disk of radius a. If the distance of…2020
- An artillery piece of mass M_1 fires a shell of mass M_2 horizontally. Instantaneously after the firing, the ratio of kinetic energy of the artillery…2024
- Three particles of masses 50 g, 100 g and 150 g are placed at the vertices of an equilateral triangle of side 1 m (as shown in the figure). The (x,…2019
- A ball is dropped from a height of 20 m. If the coefficient of restitution for the collision between ball and floor is 0.5, after hitting the floor,…2023
- Particle A of mass m_1 moving with velocity (√3 i+ j) ms^-1 collides with another particle B of mass m_2 which is at rest initially. Let V_1 and V_2…2020
- The identical spheres each of mass 2 M are placed at the corners of a right angled triangle with mutually perpendicular sides equal to 4 m each.…2024
JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.