Which of the following best describes Newton's Second Law of Motion? (more than one answer applies)
2 answers:
Answer:
F=m • a
A swimmer turns and kicks off from the end of the pool.
A book will slide across the desk if you exert a force on it.
Explanation:
The first one, F = ma is a direct expression of the Newton's second law of motion. This is because the force exerted on an object changes its momentum like this:
where (acceleration is change in velocity with respect to time)
Thus, the equation will be in the form:
F = ma
The second scenario points to an acceleration produced as a result of the force on an object. This time the feet propel the motion hence,
The third scenario is the fact that the force produces acceleration on the book.
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Answer:- molecules.
Solution:- The grams of tetrabromomethane are given and it asks to calculate the number of molecules.
It is a two step unit conversion problem. In the first step, grams are converted to moles on dividing the grams by molar mass.
In second step, the moles are converted to molecules on multiplying by Avogadro number.
Molar mass of = 12+4(79.9) = 331.6 g per mol
let's make the set up using dimensional analysis:
= molecules
So, there will be molecules in 250 grams of
.