Home
Class 8
PHYSICS
Suppose you have a balloon which has hol...

Suppose you have a balloon which has holes. Would you be able to inflate it? If not, why? Can we say that air excerts pressure in all directions?

Text Solution

Verified by Experts

The correct Answer is:
No, a balloon with holes in it cannot be inflated. It cannot be inflated because air will escape from the holes and will not be able to excert.
Doubtnut Promotions Banner Mobile Dark
|

Similar Questions

Explore conceptually related problems

Do you recall what happens to the air in the bicycle tube when it has a puncture? Do these observations suggest that air excerts p-ressure on the inner walls of an inflated balloon or a tube?

In Class VII you have learnt that in the process of digestion the food gets pushed through the alimentary canal. Could it be a muscular force that does it? You also know that lungs expand and contract while we inhale and exhale air during breathing. Where are these muscles located which make breathing possible? Can you list a few more examples of the force excerted by the muscles in our body?

You have learnt class VII that strong winds during a storm or a cyclone can blow away even the roof - tops. You also learnt that winds and cyclones are caused by the differences in air pressure. Is there any relation between pressure and force?

Suppose you have two boxes similar in appearance, one made of wood and the other made of metal. Can you tell which boa is made of metal by striking both the boxes?

The property of metals by which they can be beaten into thin sheets is called malleability. This is a characteristic property of metals. As you must have noticed, materials like coal and pencil lead do not show this property. Can we call these metals?

You have seen that a number 450 is divisible by 10. It is also divisible by 2 and 5 which are factors of 10. Similarly, a number 135 is divisible by 9. It is also divisible by 3 which is a factor of 9. Can you say that if a number is divisible by any number m, then it will also be divisible by each of the factors of m?

Recall some of your experiences. A ball rolling along the ground gradually slows down and finally comes to rest. When we stop pedalling a bicycle, it gradually slows down and finally comes to rest once its engine is switched off. Similarly, a boat comes to rest if stop rowing it. Can you add some more such experiences? What causes a change in their state of motion? Can you guess the direction in which the force must be acting in each case?

Attempt to formulate your ‘moral’ view on the practice of science. Imagine yourself stumbling upon a discovery, which has great academic interest but is certain to have nothing but dangerous consequences for the human society. How, if at all, will you resolve your dilemma ?

You may have seen in a circus a motorcyclist driving in vertical loops inside a ‘death-well’ (a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below: What is the minimum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is 25 m?

A company sells biscuitws. For packing purpose they are using cuboidal boxes : box A rarr 3 cm xx 8 cm xx 20 cm, box B rarr 4 cm xx 12 cm xx 10 cm . What size of the box will be econmical for the company? Why? Can you suggest any other size (dimensions) which has the sdame volumne but is more economical than these?