1)Polonium210 (^{210}Po) is a radioactive isotope that has an atomic nucleus with 84 protons and 126 neutrons (together, 210 nucleons). It undergoes an αdecay with a halflife of 138.4 days, resulting in a stable lead206 (^{206}Pb) isotope with a mass of 205.974 u. Assuming the polonium nucleus is at rest when it decays, an αparticle (^{4}He) with a speed of 1.6 10^{7} m/s is emitted. The αparticle has a mass of 4.002 u. The atomic unit u is defined as

=  

= 
2)Two objects, each moving with the same speed but in opposite directions, collide headon. After the collision, the smaller object of mass
is embedded in the larger object of mass
Find an expression for the final speed in terms of the initial speed. (Use the following as necessary: v_{i} for the initial speed)
Subject  Science 
Due By (Pacific Time)  11/15/2015 02:00 pm 
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