An alpha particle (a helium nucleus, containing 2 protons and 2 neutrons) starts out with kinetic energy of 10.2 MeV (10.2 × 106
eV), and heads in the direction straight toward a gold nucleus (containing 79 protons and 118 neutrons). The particles are initially far apart, and the gold nucleus is initially at rest. Answer the following questions about the collision. What is the initial momentum of the alpha particle? (You may assume its speed is small compared to the speed of light).
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Answer:
4400 Joules
73.33 Joules
25.9325 Joules
Explanation:
P = Power = 800 W
t = Time = 22 s
F = Force
r = Radius of arm = 90 cm
Energy
As the efficiency is 25%
Energy used in the race is 4400 Joules
Half of the energy is used in the arm
So, per stroke of paddle
The energy expenditure per arm stroke is 73.33 Joules
Displacement will be the half of the perimeter of the circle
Work done
The average force of the hand on the water is 25.9325 Joules