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I.D Level Problem Problem Topic
710 High school

Communication

The separation in linewidth (delta) lambda of a coarse WDM sysyem is 2.5 nm at a wavelength of 1550 nm . Derive the expression showing the relationship of the frequency bandwidth (delta) to the linewidth (delta) lambda… What is the frequency separation (delta) for this coarse WDM system ? . . . continues
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Other
2501 High school

Logic

Consider 3 dogs , A (small) , B (medium) and C (large) being taken for a walk .Dog C pulls on his leash with a force of 10 Newton’s more than Dog B . Dog B pulls with 3 times as great as dog A . Write an expression relating the forces exerted by dog A and C . . . . continues
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2504 High school

Logic

Translate the following sentence into equations . in order to obtain a relationship between the speeds of cars A and C : Car A moves 4 times slower than Car B : Car B moves twice as fast as Car C .

a) va = ¼ vc

b) va = 2vc

c) va = 4 vc

d) va = ½ vc . . . continues
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Other
3019 High school The freezing point of water can be lowered to the no less than 0*1 by the addition of salt (NaCl) , what is the salt concentration at this point ? . . . continues
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3020 High school When the partial pressure of CO2 over 20 degree C water is 1 atmosphere , 0.1688 g of CO2 is dissolved per 100 ml water . How much is dissolved if the partial pressure is raised to 785345 Pa ? What happens when the pressure is released ? . . . continues
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3028 High school Minnie mouse (mass M1 = 45.8 g ) has run to the top of a curved frictionless wedge (height H1 = 1.01 m). she slides down the track and makes a perfectly elastic collision with Mickey mouse (mass M2 = 59.9 g) who is at rest . Mickey flies off the table (height H2 = 0.812 m) above the floor and Minnie rebounds to a height H3 before she eventually fal . . . continues
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A Unit of Tiara Impex