Question

यदि वास्तविक प्रतिबिंब का आकार बिंब के आकार का बनता है और दर्पण से 18 सेंटीमीटर की दूरी पर बनता है तो दर्पण कौन सा है बताएं और उस की फोकस दूरी ज्ञात करें​

Answer 1

Explanation:

As per the question , metallic plate has mass M . Mass of bullets is m , velocity of bullets be v and rate of bullets be n bullets per second.

To find:

Force exerted by bullets on plate.

Concept:

We shall be using Conservation of Momentum concept for solving this type of questions .

Calculation:

Force exerted by the bullets on the wall will be equal to the rate of change of momentum of bullets.

Let number of bullets be N.

Let force be F

F = \sf{net \: momentum \: change}F=netmomentumchange

= > F = \sf{ \dfrac{momentum \: change}{time} }=>F=

time

momentumchange

= > F = \sf{ \dfrac{N(initial \: P - final \: P)}{time} }=>F=

time

N(initialP−finalP)

= > F = \sf{ \dfrac{N(mv - 0)}{time} }=>F=

time

N(mv−0)

= > F = \sf{ \dfrac{N}{time} } \times (mv)=>F=

time

N

×(mv)

= > F = \sf{ n \: \times (mv)}=>F=n×(mv)

= > F = \sf{ nmv}=>F=nmv

So final answer :

Force on metallic plate is (nmv) units.