Answer:
B. 2.9X10^21
Explanation:
The volume of air inside a breath is
Of this, only 20% is oxygen, so the volume of oxygen is
Then we can find the number of moles of oxygen by using the ideal gas equation
where we have
is the gas pressure
is the oxygen volume
n is the number of moles of oxygen
is the gas constant
T = 300 K is the temperature
Solving for n, we find
Since the number of molecules in 1 mol is
(Avogadro number)
Then the number fo molecules in of oxygen is
Answer:
inelastic collision.
Explanation:
An elastic collision consists in a collision in wich the bodies implied bounce off. Furthermore, the momentum of the bodies is conserved.
In as inelastic collision the momentum is not conserved, and is possible that the bodies implied in the collision stay joint after the collision.
In this case yo have that both bumper car and truck stayed joint after the collision. Hence, this situation is an inelastic collision.
Answer:
When an air particle bombards a smoke particles, the smoke particle moves to the same direction as the air particle that hit it. When another air particle hits the smoke particle, it changes its direction to that of the second air particle, and so on. This is called Brownian motion.
Answer:
B. Both electric fields and forces ...
Explanation: