Optics, Physics

Assignment Help:

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.


Related Discussions:- Optics

What is the mass of the truck - collision, A 985-kg car travelling south at...

A 985-kg car travelling south at 29.0 m/s hits a truck travelling  18.0 m/s west, as shown in the figure below. After the collision, the vehicles stick together and travel with

Explain slip-ring, Explain Slip-ring Slip-ring (or phase- wound)  ro...

Explain Slip-ring Slip-ring (or phase- wound)  rotor having of a slotted laminated core of sheet steel. A three- phase winding is placed in the rotor slots. The rotor windin

Colours of white light travell , Why different colours of white light trave...

Why different colours of white light travell with different speed in a glass prism,while they travell with same speed in air? Ans)Since in diffeernt medium frequecy remains const

Mathematical description of surface tension, Surface tension is described a...

Surface tension is described as the force per unit length in the plane of a liquid surface, operating at right angles on both sides of the imaginary line drawn on the surface T

Doppler effect, Draw a picture of a moving source and the waves surrounding...

Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source comp

Ohmmeters, ohmmeters: The use of ohmmeters is somewhat more involved. M...

ohmmeters: The use of ohmmeters is somewhat more involved. Most importantly when measuring resistance the circuit power must be switched off, power is derived from within the i

Explain squirrel cage induction motors, Mines Flame proof squirrel cage...

Mines Flame proof squirrel cage induction motors are used in coal mine.

Tunnel diode: its construction and working, A tunnel diode is a highly cond...

A tunnel diode is a highly conductively two terminal P-N junction doped heavily about 1000 layer width is a high conductively two terminal conventional diode. Because of heavy dopi

How is a galvanometer converted into an ammeter, Define the growth and deca...

Define the growth and decay of current in an inductance, resistance circuit. How the growth and decay are affected with different values of inductance discuss? How is a galvano

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd