How should the table be changed to correctly distinguish between mechanical and electromagnetic waves? Earthquake waves and radi
2 answers:
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Answer:
Explanation:
1) The moment of inertia of the grindstone is:
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.
Learn more about impulse and change in momentum:
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Answer:
6.82%
Explanation:
If 44 ±3 beats are counted in 30 seconds, twice the number of beats will be counted in 1 minute or 60 seconds, i.e. 88 beats per minute. The absolute uncertainty in 1 minute will also be twice the uncertainty in 30 seconds, so 88 ±6 beats per minute.
The percentage uncertainty can be found by below:
The percentage uncertainty can also be found for the 30 second interval
While the absolute uncertainty varies depending on the time interval, the percentage uncertainty remains the same: 6.82%