JEE Main 2019 (Online) 8th April Evening Slot | Center of Mass and Collision Question 90 | Physics

JEE Main 2019 (Online) 8th April Evening Slot

MCQ (Single Correct Answer)

-1

A uniform rectangular thin sheet ABCD of mass M has length a and breadth b, as shown in the figure. If the shaded portion HBGO is cut-off, the coordinates of the centre of mass of the remaining portion will be :- JEE Main 2019 (Online) 8th April Evening Slot Physics - Center of Mass and Collision Question 90 English

JEE Main 2019 (Online) 8th April Evening Slot Physics - Center of Mass and Collision Question 90 English

$$\left( {{{5a} \over 3},{{5b} \over 3}} \right)$$

$$\left( {{{2a} \over 3},{{2b} \over 3}} \right)$$

$$\left( {{{5a} \over 12},{{5b} \over 12}} \right)$$

$$\left( {{{3a} \over 4},{{3b} \over 4}} \right)$$

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

Four particles A, B, C and D with masses m_A = m, m_B = 2m, m_C = 3m and m_D = 4m are at the corners of a square. They have accelerations of equal magnitude with directions as shown. The acceleration of the centre of mass of the particles is : JEE Main 2019 (Online) 8th April Morning Slot Physics - Center of Mass and Collision Question 92 English

JEE Main 2019 (Online) 8th April Morning Slot Physics - Center of Mass and Collision Question 92 English

$${a \over 5}\left( {\mathop i\limits^ \wedge + \mathop j\limits^ \wedge } \right)$$

$${a \over 5}\left( {\mathop i\limits^ \wedge - \mathop j\limits^ \wedge } \right)$$

$${a }\left( {\mathop i\limits^ \wedge + \mathop j\limits^ \wedge } \right)$$

Zero

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

If 10²² gas molecules each of mass 10^–26 kg collide with a surface (perpendicular to it) elastically per second over an area 1 m² with a speed 10⁴ m/s, the pressure exerted by the gas molecules will be of the order of :

10⁸ N/m²

10¹⁶ N/m²

10⁴ N/m²

2 N/m²

JEE Main 2019 (Online) 12th January Evening Slot

MCQ (Single Correct Answer)

-1

An alpha-particle of mass m suffers 1-dimensional elastic collision with a nucleus at rest of unknown mass. It is scattered directly backwards losing, 64% of its initial kinetic energy. The mass of the nucleus is

1.5m

3.5m

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