Question
A and B together can complete a piece of work in 30 days
while A alone can complete 50% of the work in 20 days. Find the time taken by B to complete 70% of the work.Solution
Time taken by A to complete the whole work = 20/0.50 = 40 days Let total work = 120 units Amount of work done by A and B together in one day = 120/30 = 4 units Amount of work done by A alone in one day = 120/40 = 3 units Amount of work done by B in one day = 4 – 3 = 1 units Desired time = 0.70 × 120/1 = 84 days
A pond of water appears less deep due to –
Which law states that the ratio of the potential difference across a conductor to the current through it is constant, provided the temperature remains c...
When white light passes through a glass prism, which color deviates the least?
The weight (W) of a body is derived from which formula?
What is the momentum of a 2 kg object moving at 3 m/s?
In an experimental arrangement of a Fresnel's biprism, monochromatic light of wavelength 2. is used to produce interference fringe pattern. On introduc...
Parsec is the unit of
Match the following machines with their working principles:
(i) Electric motor - (a) Heat energy into mechanical energy
(ii) Steam engin...
What happens to the electrostatic force between two charges when the distance between them decreases?
Relevant for Exams:
