A submarine travels 25 km/h north for 3.2 hours. What is its displacement?
2 answers:
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The collision of car 2 is more violent (because more impulse is exerted)
Explanation:
The collision which is more violent is the one in which more impulse is exchanged.
The impulse exerted by each car on the wall is equal to the change in momentum of the car:
where
m is the mass of the car
is the change in velocity
For the car 1,
m = 1000 kg
(the sign is negative because the velocity of the car has changed from 100 km/h to 0 km/h)
So the magnitude of the impulse of car 1 is
For the car 2,
m = 1200 kg
So the magnitude of the impulse of car 2 is
So, car 2 exerts a larger impulse, therefore its impact is more violent.
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Answer:
When the net external force is zero
Explanation:
We can answer to this question by referring to Newton's Second Law, which can be written in the following form
where
F is the net external force acting on a system
is the change in momentum of the system
is the time interval
When the total momentum of a system is conserved (so, it does not change), its variation is zero:
In order to satisfy this condition, we see from the formula that we must also have
F = 0
so the net external force acting on the system must be zero.