Question

the average speed of a nitrogen molecule in air at 25 degree Celsius is 5.5 metre per second convert into miles per hour​

Answer 1

Explanation:

(a) Let the x axis be in the original direction of the molecule’s motion. Then, from

v

f

=v

i

+at,

we have

a=

t

v

f

−v

i

=

3.00∗10

−13

s

−670m/s−670m/s

=−4.47∗10

15

m/s

2

(b) For the molecule, ∑

F

=m

a

. Its weight is negligible.

F

wall.on.molecule

=(4.68∗10

−26

kg)(−4.47∗10

15

m/s

2

)

=−2.09∗10

−10

N

F

molecule.on.wall

=+2.09∗10

−10

N

Answer 2

Given - Average speed = 5.5 metres per second

Find - Average speed in miles per hour

Solution - To convert the speed into miles per hour, firstly we will relate metres with miles and second with hour.

So, 1 meter = 0.000621371 miles

And, 1 hour = 3600 second

Thus, 1 second = 1/3600 hour

So, keeping the values as per the place of unit to convert into miles per hour.

Average speed = 5.5*0.000621371/(1/3600)

Average speed = 5.5*0.000621371*3600

Average speed = 12.3 miles per hour.

Thus, average speed of nitrogen molecule will be 12.3 miles per hour.