Aproton of mass m is at rest when it is suddenly struck head-on by an alpha particle (which consists of 2 protons and 2 neutrons) moving at speed v. if the collision is perfectly elastic, what speed will the alpha particle have after the collision? (assume the neutron's mass is equal to the proton's mass.) a) zero b) 2v/3 c) 3v/5 d) 5v/3

The answer is c). The alpha particle will have a speed of 3/5 v.

Explanation:

In a perfectly elastic collision the momentum and the kinetic energy are maintained.

The equation to describe the velocity of the particles is:

From the problem you have:

Then you solve the equation using the information in the problem. In this case, A is the alpha particle and B is the proton.

i think the answer is a, hope this : )

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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