Dave throws a 10 kg bowling ball straight up in the air. At the very tippy-top of its path, what is it's momentum?
1 answer:
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The frictional force between two surfaces is given by:
where
is the coefficienct of friction
is the force with which one surface is pushed against the other one
Looking at the formula, we see that there are two possible ways to increase the friction:
1) by increasing the coefficient of friction (for instance, by making the surfaces more "rough"
2) by increasing, the force with which one surface is pushed against the other
Similarly, in order to decrease the friction, the two possible ways are:
1) by reducing the coefficient of friction
2) by reducing the force
where
Looking at the formula, we see that there are two possible ways to increase the friction:
1) by increasing the coefficient of friction
2) by increasing
Similarly, in order to decrease the friction, the two possible ways are:
1) by reducing the coefficient of friction
2) by reducing the force
Answer:
Explanation:
The Stefan–Boltzmann law for a black body (as stars are treated) can be written as , where
is the total energy radiated per unit surface area across all wavelengths per unit time,
the absolute temperature and
is the Stefan–Boltzmann constant.
If we multiply by the surface area
of the star we get the total energy radiated across all wavelengths per unit time, which is the total power radiated, so we can write:
where we have used the formula for the surface area of a sphere
Solving for r we have: