Question
In a fixed time, a boy swims thrice the distance along
the current that he swims against the current. If the speed of the current is 5 km/hr, the speed of the boy in still water isSolution
Let the rate of swimming in still water be x km/hr Rate down-stream = (x + 5) km/hr Rate up-stream = (x – 5) km/hr According to the question, (x + 5) t = 3 (x – 5) × t x + 5 = 3x – 15 x = 10 km/hr
Two bodies of masses 3 kg and 5 kg are connected by a string and placed on a smooth horizontal surface. A force of 40 N is applied on the 5 kg block. Wh...
The group velocity of matter waves associated with a moving particle is:
In a logic gate, the output is 1 only when at least one input is 1. This gate is:
A particle starts from rest and accelerates uniformly at 2 m/s² for 5 seconds, then moves with constant speed for 5 seconds and finally decelerates uni...
Which of the following is an example of longitudinal waves in a gas medium?
Which quantity has the same dimensional formula as impulse?
What happens to the electrostatic force between two charges when the distance between them decreases?
Specific resistance of a conductor increases with :
Calculate the work done in moving a charge of 2 C across two points having a potential difference of 12 V.
Going from fluorine to chlorine, to bromine and then to iodine, the electro negativity:
