Answer:
666.6 seconds
Explanation:
if he runs at 3m/sec he will achieve the goal of 2000m in 666.6 seconds. just divide - 3/2000.
note we have changed 2km to 2000metres
The answer is B, 1/4 of the cake
Answer:
mercury vapour
Explanation:
it contains many other gases and it contains mercury vapour
Consider the Earth as a sphere. Think of the atmosphere as having a height of say about 20000 m. The volume of a sphere is 4/3 * pi * r ^3.
Find the volume of a sphere of radius 6020000 m and subtract the volume of the Earth which is a sphere of radius 6000000 m (approx).
This would be the volume of air in m^3.
Approximate the lungs as a cube, it would be approx 0.2m x 0.2m x 0.2 m = 0.008 m^3
Divide the volume of air around the Earth by 0.008.
0.001 m^3 of air contains about 6 x 10^23 molecules which is about 12 x 10^23 atoms.
If your lungs are 0.008 m^3 then that would be about 96 x 10 ^23 or about 10^25 atoms.
Compare that number with the earlier number when dividing air in the atmosphere by 0.008.
I hope this helps. :)
Answer:
Explanation:
Let mass of ice required is m kg
Heat gained by ice to attain zero degree
= m x 14.1 x 2100
= 29610m J
Heat gained by ice to melt = m x 3.34 x 10⁵ J
= 334000m J
Heat gained by water at zero degree to warm up to 27 degree
m x 4190 x 27 =113130 J
Total heat gained = 476740m J
Heat lost by hot water to cool up to 27 degree
.24 x 4190 x ( 75.8 - 27 )
= 49073.28 J
Heat lost = heat gained
476740 m = 49073.28
m = 49073.28/476740 kg
=102.93 gm
