Here's all the Physics you have to know
in order to answer this question:
==> Acceleration = (change in speed) / (time for the change)
That's it. Now let's work on it with the numbers from the train.
Change in speed = (speed at the end) - (speed at the beginning)
For the train, speed at the beginning is zero, so the change is 72 km/h .
Time for the change = 5 minutes.
Acceleration = (72 km/hr) / (5 minutes)
Acceleration = 14.4 km per hour per minute .
That answer is 100% true and correct, but it has a weird,
awkward unit.
Anybody you show it to would probably want to see it with
a more familiar unit, like "meters per second per second"
like the unit that we use for the acceleration of gravity.
It's pretty easy to change units, and it doesn't even take
any Physics. All it takes is Arithmetic.
So far, we have Acceleration = 14.4 km/hr·minute
Multiply that by (1000 meter/km)
Then multiply it by (1 hour/60 minutes).
Then multiply it by (1 minute/60 seconds)².
All of these fractions are equal to ' 1 ', because each top number
is equal to each bottom number. So they won't change the VALUE
of the answer. They'll just change the units.
(14.4km/hr·minute)·(1000m/km)·(1 hour/60minutes)·(1 minute/60seconds)²
= (14.4·1000 / 60·60·60) · (km·meter·hr·min·min / hr·min·km·min·sec·sec)
= 0.0667 meter/second²
With similar methods, it could be changed to other units:
-- 6.67 centimeter/second²
-- 66.7 millimeter/second²
-- 240 meter/minute²
-- 864 km/hour²
These are all THE SAME NUMBER, only with different units.
Answer:constant acceleration slows down constant velocity
Explanation:
Answer:
Force.
Explanation:
SImple as that. think of Newtons Laws.
Answer:
Required answer = 2.7 x 10^16 MOLECULES
Explanation:
We know that
1 m = 100 cm
so 1 m^3 = (100 cm)^3 = 1000000 cm^3 = 1 x 10^6 cm3
as per question, 2.7*10^{10} molecules in 1 cm^3
so number of molecules in 1 m^3
Number of molecules = ( 2.7 x 10^10 molecules /1 cm^3 ) x ( 1 x 10^6 cm3 / 1 m3)
Number of molecules = 2.7 x 10^10 x 1 x 10^6 = 2.7 x 10^16 per m3
Required answer = 2.7 x 10^16 MOLECULES
Answer:
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