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A spider is hanging by means of its own silk thread directly above a transparent fixed sphere of r = 20cm .... the refractive index of material of sphere is root(2).... and height of the spider is 2r = 40cm .... an insect initially sitting at the bottom directly below the spider starts crawling along vertical circular path with constant speed pi/4 cm/s.. for how long will the insct be invisible to the spider. Assume that it crawls once around the circle .Solution) Spider is able to see only half of the sphere which is topmost hemispherical surface. when insct enters in bottom hemispherical surface it becomes invisible for the spider. a/c question insct is travelling vertical circular path it travels pi/4cm in 1sec.then it will travel 2pi r dist i.e. 40picm in 160sec. hence it will travel pi r i.e20pi (half circle) in 80s.
What is the cause of Brownian motion? Molecules in a gas move constantly, freely, randomly, in all directions and at high speeds. They are able to do so because the intermolecu
# Soru ..
X-rays was discovered by scientist Rontgen that's why they are also known as Rontgen pulses. Rontgen discovered that when pressure inside a discharge tube kept 10 -3 mm of Hg a
Q. Explain the steps to the scientific notation? Answer:- To write in scientific notation you must first move the decimal point of the number to where the number is betwee
The turning movement of a particle about the axis of rotation is called the angular momentum of the particle and is measured as the product of the linear momentum and the perpendic
Which of the following particles has more electrons than neutrons: (1) C (2) F- (3)O -2 (4)Al +3 Ans: O -2
It is the force that the field would exert on any unit magnetic pole placed in the field. It is also known as magnetic force.
In certain ranges of a piano keyboard, more than one string is tuned to the same note to provide extra loudness. For example, the note at 110 Hz has two strings at this frequency.
It is the molecular weight of a substance expressed in grams ; the basic unit of amount of substance adopted under the Systeme International d''Unites.
what is mean by priciple of moments
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