ICSE − Q & A

How is focal length related to r.i.?

if the value of g is not given.
which one should be used :- 9.8 OR 10????

hiiii,could someone help me with these qns??
1)in selina pg 46,qn 6
The bob of a simple pendulum is imparted a velocity of 5m/s when it is at its mean position.To what max vertical ht will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air??(Answer 0.75m)
plzz explain how to solve it.
2)pg;67 qn 2:
A fixed pulley is driven by a 100kg mass falling at a rate of 8.0m in 4s.It lifts a load of 75kgf.calc:
(a)the power input
(b)efficiency
(c)ht to which the load is raised in 4s.
I did the first part but dont know how to do the rest.Plzz help....
3)in selina,there are no experiments given for calorimetry.Then should I learn that???
plzz answer asap............

Define one dioptre

Two medical uses of SONAR???

+ 2 more questions by aayushjoshi  

An electric pump is used to lift 500 kg of water from a depth of 80 m in 10 seconds. Calculate power rating of the pump if its efficiency is 40%.
asked by Aayush Joshi (aayushjoshi) 6 years ago
5

What is the meaning of power rating???
asked by Aayush Joshi (aayushjoshi) 6 years ago
2

who are moderators in board and what they do

+ 1 more questions by mdarfath  

can anyone say the examples of lateral displacement and bending of pen in water when viewed from air is not a example of lateral displace . is that correct ?
asked by Rtstud (mdarfath) 6 years ago
0

Unit of intensity

+ 1 more questions by jgpvgp  

What is meant by ;The refractive index of diamond is 2.41 ?
asked by Gangadharanpillai Gangadharanpillaik (jgpvgp) 6 years ago
2

I follow selina book and there has been a numerical from electricity chapter which seems a bit different-
The power rating of an electric bulb is 40W 220 V. Find the power when the potential difference is reduced to 200V.

Is the resistance taken constant here or the current?

+ 1 more questions by prat172  

Find the refractive index of the denser with respect to the rarer medium? Should it be - rUd or dUr
asked by Prateek Mukherjee (prat172) 6 years ago
4

Does a rain drop reaches the with constant velocity ?? Give reason for your answer.

Guys after the "ban' was lifted i just realized i can not only see respapers for free but also download them in pdf format.....!!! yahoooo