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: Option (c) is the correct answer.
Explanation:
Sun is a large star and as it is given that it's diameter is 1,393,000 km. Since there are nuclear reactions that take place inside the Sun, therefore, there is emission of lot of radiations.
As a result, lot of heat energy is there. So, the statement at the surface Sun’s temperature is about 550 degrees Celsius will be an error.
Thus, we can conclude that this error is identified by the statement the Sun’s surface temperature is about 5500 degrees Celsius.
Plant's produce oxygen, to explain this you would state that the plant uses CO2 from the air and removes the carbon and then release breathable O2 into the atmosphere. To test this you could use a small fern and put it in a sealed container of some kind big enough to hold it, then add a burning candle in the container with the plant, since we know fire burms O2 and creates CO2 the plant should use the CO2 and create more O2 keeping the fire from burning out from lack of oxygen
Answer:
the object has a net force acting on it, it will accelerate the object will speed up, slow down, or change direction.
Explanation:
