Conservation of Momentum
Ex) 12,600 kg railroad car travels on a frictionless surface with a constant speed of 18.0 m/s. A 5350 kg load at rest is dropped onto the car, what will the car's new speed be?
Total momentum before = total momentum after m_{1}v_{1} = m_{2}v_{2}
V_{2} = 12.6 m/s
Ex) An atomic nucleus moving at 420 m/s emits an alpha particle in the direction of its motion and the remaining nucleus slows to 350 m/s. If the alpha particle has a mass of 4.0 µ and the original nucleus has a mass of the 222 µ, what speed does the original alpha particle have when it is emitted?
No need to convert mass to kg. Why?
Before Original nucleus = mass = 222 µ, v = 420 m/s After alpha particle = mass of 4.0 µ v = ? New Nucleus = 218 µ (alpha lost) v = 350 m/s Speed of original alpha particle have when it is emitted?
mv = m_{a}v_{a} + m_{n}v_{n}
v = 4.2 x 10^{3} m/s
İTony Mangiacapre.,  All Rights
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