b) Give reasons for the following:
(i) A hot air balloon comes down when the flame is turned off or reduced.
(ii) Banners and advertisement boards get ripped and blown off during cyclones.
Answers
Step-by-step explanation:
(i) As we know objects like air conditioners work on the principle:
Hot air goes up while cold air goes down and sinks.
So here when we stop the flame or reduce the flame there is no hot air to go up and lift the balloon.
(ii)Banners and advertisement boards are just forms of paper applied on metal boards so they get blown off and torn apart due to the immense force and pressure applied by the air from cyclones.
PLEASE MARK MY ANSWER AS BRAINLIEST.
Step-by-step explanation:
answer of the question a is
The balloon will stop rising if the upward buoyant force is overcomed by the downward gravitational force. This will happen if the balloon reaches a height where density of air is nearly equal to the density of hot air within the balloon. Or if the air within the balloon cools down. In these cases the upward thrust will be reduced and the balloon will start moving downward.