Let the speed of the boy in still water be x kmph. Then, (x + 3) × 4 = (x – 3) × 5 => 4x + 12 = 5x - 15 => x = 27 kmph
The absolute temperature of a body A is five times that of another body B. For two bodies, the difference in wave lengths at which energy radiated is ma...
Why does a large fire in the open appear to be fanned by strong winds?
The magnetic equator is closely associated with which of the following?
A battery of emf 12 V and internal resistance 4 ohm is connected to a resistor. If the current in the circuit is 0.6 A, what is the resistance of the re...
What is the SI unit of magnetic flux?
The electric and magnetic fields of an electromagnetic wave are _____________
The potential inside a charged hollow sphere is __________.
A toroid has a core (non-ferromagnetic) of inner radius 23 cm and outer radius 28 cm, around which 4000 turns of a wire are wound. If the current in th...
In which type of motion does the velocity of a body vary with time?
A copper block of mass 3 kg is heated in a furnace to a temperature of 450°C and then placed on a large ice block. Find the maximum amount of ice that...
