Author Question: A proton, of mass m and speed v, strikes an alpha-particle (which consists of 2 protons and 2 ... (Read 41 times)

NClaborn · **on:** Jul 27, 2018

A proton, of mass m and speed v, strikes an alpha-particle (which consists of 2 protons and 2 neutrons) at rest.

If the collision is completely elastic, what speed will the -particle have after the collision? (Assume the neutron's mass equals the proton's mass.) A) zero
B) 3/2 v
C) 2/5 v
D) 2/3 v
E) 5/3 v

Question 2

Which is NOT a critical factor that determines the habitability of a rocky planet?

A) size
B) distance from parent star
C) presence of a magnetic field
D) presence of an atmosphere