# Project #93539 - physics

1)Polonium-210 (210Po) is a radioactive isotope that has an atomic nucleus with 84 protons and 126 neutrons (together, 210 nucleons). It undergoes an α-decay with a half-life of 138.4 days, resulting in a stable lead-206 (206Pb) isotope with a mass of 205.974 u. Assuming the polonium nucleus is at rest when it decays, an α-particle (4He) with a speed of 1.6  107 m/s is emitted. The α-particle has a mass of 4.002 u. The atomic unit u is defined as

1 u = 1.6605677  10-27 kg.

(a) In what direction does the daughter isotope 206Pb move?

(b) What is the speed of the 206Pb leaving the decay zone?
m/s

(c) Compare both speeds in this problem to the speed of light in a vacuum.
 vα c
=

 vPb c
=

2)Two objects, each moving with the same speed but in opposite directions, collide head-on. After the collision, the smaller object of mass

m = 280 g

is embedded in the larger object of mass

M = 675 g.

Find an expression for the final speed in terms of the initial speed. (Use the following as necessary: vi for the initial speed)

vf =

3)An object of mass
m = 6.6 g
is fired into a larger object of mass
M = 310 g
that was initially at rest at the edge of a table. The smaller object becomes embedded in the larger object (perfect inelastic collision) and the combined object lands on the floor a distance of 2 m away from the table. If the tabletop is 1 m above the floor, determine the initial speed of the smaller object.
m/s

 Subject Science Due By (Pacific Time) 11/15/2015 02:00 pm
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