Answer:
a = 2.5 [m/s²]
Explanation:
To solve this problem we must use the following equation of kinematics.
![v_{f} =v_{o} +a*t](https://tex.z-dn.net/?f=v_%7Bf%7D%20%3Dv_%7Bo%7D%20%2Ba%2At)
where:
Vf = final velocity = 25 [m/s]
Vo = initial velocity = 0 (star from the rest)
a = acceleration [m/s²]
t = time = 10 [s]
25 = 0 + (a*10)
a = 25/10
a = 2.5 [m/s²]
Answer: It remains the same
Explanation:
The Conservation of Momentum principle establishes that the initial momentum
must be equal to the final momentum
:
(1)
In the case of the train, its initial momentum is:
(2)
Where
is the mass of the train and
is the initial velocity of the train
And, its final momentum is:
(3)
Where:
since we are told the mass of the train is doubled
since we are told the velocity of the train goes to half
Hence:
(4)
(5)
(6)
This means the momentum of the train remains the same.
Yes, entropy increases during sublimation. This is because, there is a change of phase from a solid state to a gaseous state which causes an increase in the disorderliness of the particles in the solid matter.
This is because thats just not how water moves. Each particle is water has it’s own status and it will almost never behave perfectly and form a V. It may be near the shape, but it will never be perfect since each water molecule is separately impacting everything, including itself.