Question
Time taken by pipe 'A' to fill a tank is 45 minutes.
When both pipes 'A' and 'B' are opened together, the tank gets filled in 18 minutes. Find the time taken by 'B' to fill the tank alone.Solution
Let the capacity of the tank be 90 litres (LCM of 45 and 18).
Efficiency of 'A' = (90/45) = 2 litres/minute
Combined efficiency of 'A' and 'B' = (90/18) = 5 litres/minute
Efficiency of 'B' = 5 - 2 = 3 litres/minute
Therefore, required time = (90/3) = 30 minutes
Hence, the answer is 30 minutes.ย
The mass and energy equivalent to 1 a.m.u. respectively are -
A coil takes 4 A from a 12 V DC source. When connected to a 12 V, 50 rad/s AC source, the current is 2.4 A. The inductance of the coil is:
A particle with charge q = 2 ฮผC moves through a magnetic field B = 0.5 T with velocity v = 4 m/s at angle 60ยฐ. Find magnitude of magnetic force.
Which one of the following is called a red planet?
What is the unit of the refractive index?
Angle of friction and angle of repose are
Which of the following is a nonrenewable source of energy?ย ย
Two cities are 125 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 9.6 volt and the...
An electron and a proton are accelerated by the same potential difference. Which one has a longer de Broglie wavelength?
Relevant for Exams:
