When a heavy football player and a light one run into each other, which player hits the other with more force? Explain. Which on
1 answer:
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Answer:
,
Explanation:
The situation can be modelled by applying the Principle of Angular Momentum Conservation:
The final angular speed is:
The tangential velocities of the wheel and the clay are, respectively:
Answer:
The radius r of the metal sphere.
Explanation:
From Gauss's law we know that for a spherical charge distribution with charge , the electrical field at distance
from the center of the sphere is given by
What is important to notice here is that the radius of the sphere does not matter because any test charge sitting at distance feels the force as if all the charge
were sitting at the center of the sphere.
This situation is analogous to the gravitational field. When calculating gravitational force due to a body like the sun or the earth, we take not of only the mass of the sun and the distance from it's center; the sun's radius does not matter because we assume all of its mass to be concentrated at the center.