COMEDK 2023 Evening Shift | Center of Mass and Collision Question 5 | Physics

A neutron makes a head on elastic collision with a lead nucleus. The ratio of nuclear mass to neutron mass is 206 . The fractional change in kinetic energy of a neutron is

3% increase

2% decrease

2% increase

3% decrease

COMEDK 2022

MCQ (Single Correct Answer)

-0

A bullet of mass $m$ hits a mass $$M$$ and gets embedded in it. If the block rises to a height $$h$$ as a result of this collision, the velocity of the bullet before collision is

$$v=\sqrt{2 g h}$$

$$v=\sqrt{2 g h}\left[1+\left(\frac{m}{M}\right)\right]$$

$$v=\sqrt{2 g h}\left(1+\sqrt{\frac{M}{m}}\right)$$

$$v=\sqrt{2 g h}\left[1-\left(\frac{m}{M}\right)\right]$$

COMEDK 2022

MCQ (Single Correct Answer)

-0

From a circular disc of radius R, a square is cut out with a radius as its diagonal. The centre of mass of remaining portion is at a distance (from the centre)

$${R \over {(4\pi - 2)}}$$

$${R \over {2\pi }}$$

$${R \over {\pi - 2}}$$

$${R \over {2\pi - 2}}$$

COMEDK 2021

MCQ (Single Correct Answer)

-0

Which of the following quantity represents the dimensions of momentum?

Impulse

Pressure

Viscosity

Power

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