Answer:
the SI unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour.
Answer:
for every action, there is an equal and opposite reaction.
Explanation:
the statement means that every interaction there is a pair of forces acting on the two interacting objects.
Answer:
0.5 g
Explanation:
The half-life of a radioactive isotope is the time it takes for a certain amount of that isotope to halve.
In this case, we have an isotope of Americium-241, which has a half-life of

This means that after 1 half-life (432 years), there will be an amount of americium equal to half its initial amount.
In this problem, the initial amount of americium is

Therefore, after 432 years (1 half-life), the amount of americium left will be half:

Plants have cell walls, but animals do not because otherwise we wouldn't be able to move.
the unit for mass is kilogram