Advertisements
Advertisements
Question
Explain why holes are made in hanging banners and hoardings.
Advertisements
Solution 1
Air exerts pressure. Wind blowing in high speed may break or displace many things. If holes are made in hanging banners and hoardings, then air can pass through these holes, which reduces the air pressure exerted on the banners and hoardings. That is why holes are made in hanging banners and hoardings
Solution 2
Air exerts pressure. Due to this pressure banners and hoarding flutter and torn when wind is blowing fast. Holes are made in banners and hoardings so that wind passes through the holes and they do not become loose and fall down.
RELATED QUESTIONS
What is the purpose of a barometer?
What is a barometer?
Why is the barometric height used as unit to express the atmospheric pressure?
How will you show that there is vacuum above the surface of mercury in a barometer? What name is given to this vacuum?
State two uses of a barometer.
Explain briefly the factors that affect Atmospheric Pressure.
Name the instrument used to measure atmospheric pressure.
Give reason:
Air pressure decreases with increasing altitude.
What is meant by atmospheric pressure?
The increase in internal energy of 1 kg of water at 100°c when it is converted into steam at the same temperature and at 1 atmospheric pressure will be ______.
(density of steam is 0.6 kg m-3, latent heat of vaporisation of water = 2.25 × 106 J kg-1).
