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What else can I help you with?
Do objects weigh less in water or do they just appear to be weightless?
Objects weigh less in water than they do in air because of the buoyant force exerted by the water. This force counteracts the weight of the object, making it feel lighter or even weightless when submerged in water.
Is refractive index of air less than vacuum?
No, refractive index(RI) of air is more than that of vaccum. Infact RI of any medium is more than vaccum. RI of vaccum is 1. RI of any medium = c/v where c is speed of light in vaccum v is speed if light in medium whose RI with respect to vaccum is found. It is known that speed of light is maximum in vaccum so v < c, and RI > 1.
How do eliminate air?
use a vaccum and a vaccum airtight chamber
What position is a person weightless?
When someone is freefalling in thee air thus they become weightless
Why do lighter objects fall slower than heavier objects?
In a vacuum. like in outer space, all substances fall at the same rate. Here on earth, the rate of falling is influenced by air resistance. A feather has 'way more air resistance than a ball of steel, for example, so falls slower.
Why do objects seem to be lighter in water than in air?
Objects are more buoyant in water than in air.
What must you feel with empty hands?
Nothing Air (other than putting your hands in vaccum, you must feel it)
Why does an astronaut have to wear a helmet on the moon?
There is no air on the moon. It is a vaccum. Exposure to a vaccum will kill a person in seconds.
How does air effect sound?
In vaccum there is no sound.
Is their a word for absence of air?
the absence of air is "vacuum"
Will a body weigh more in air in vacuum when weighed with a spring balance.give a reason for your answer?
The body would wiegh more in air than in vaccum because as we know that there many particles in the air and so their weight whether less or more will be considered with it but in vaccum it's opposite.
What is the gravitational acceleration of earth in a weightless environment?
I don't quite understand why you mix "gravitation" and "weightless" in the question. The gravitational acceleration of Earth is 9.8 m/sec2 near the surface; further away, it will gradually decrease. The presence of air - if that is what you referring to - is quite irrelevant to the fact that there is gravitation.
