Question
60 boys can complete a piece of work in 60 days. They
started the work together. But at the end of every 10th day five more boys have joined. Exactly on which day will the whole work be completed?Solution
ATQ, Required boys -hrs = 60 à 60 = 3600 boys-hrs. Boys-hrs completed in fifty(50) days = 10(60 + 65 + 70 + 75 + 80) = 3,500. Hence Balance left = 3600-3500 = 100 Let X days be required to complete the remaining 100 boys- hrs. Now, (x)(85) = 100 x = 1(3/17) days i.e., work is completed in 51(3/17) days i.e., on 52 nd day work is completed.
A 100 ÎŒF capacitor is charged to a voltage of 50V. How much energy is stored in the capacitor?
What is the unit of the refractive index?
The mass and energy equivalent to 1 a.m.u. respectively are -
Which type of mirror is used in car headlights?
The electric and magnetic fields of an electromagnetic wave are _____________
Which law states that the total current entering a junction is equal to the total current leaving the junction?
A solid non-conducting sphere of radius R carries a uniform volume charge density Ï. What is the ratio of electric field at r = R (surface) to that at ...
Compared to fresh Water, the freezing point of sea water is -
Water flows in a horizontal pipe of non-uniform area of cross-section at a pressure difference of 1.6 cm of mercury. If the velocity of water at the la...
The refractive index of glass is 1.5. What is the speed of light in glass?
(Speed of light in vacuum is 3.0 Ă108 m s-1)
