A bullet is shot into a block of plastic. The bullet penetrates the block 0.6 m. The mass of the bullet is 10 g. It is traveling with a speed of 380 m/s before it hits the block. (a) Use kinematic equations to find the magnitude of the acceleration on the bullet as it is penetrating the block (ignore gravity, and assume that the force on the bullet as it penetrates the block is constant).
(b) Use Newton's 2nd Law to find the magnitude of the force exerted on the bullet by the plastic block.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.