Question
Two trains of length 200 m and 325 m long are running on
parallel rail tracks at speeds of 78 km/h and 60 km/h, respectively. In how much time (in seconds) the faster train cross the slower one if they are running in the same direction?Solution
Speed of the faster train=78×5/18 =390/18=21.67m/sec. Speed of slower train =60×5/18 =300/18 =16.67m/sec Since the trains are moving in the same direction, the relative speed is the difference between their speeds: Relative speed. = 21.67 m/s -16.67 m/s = 5 m/s The total distance to be covered is the sum of the lengths of the two trains: Total distance = 200 m + 325 m =525 m Time taken to cross Total distance Relative speed. =525 m /5 m/s Time = 105 seconds
If the Earth stopped rotating, what would happen to the apparent value of gravity (g) at different locations?
What does the slope of a velocity-time graph represent?
The resistance of a wire is directly proportional to:
What does 'IC' stand for in electronics?
When heated from 0° to 10°C volume of a given mass of water will -
A soap bubble expands isothermally and its radius doubles. The work done by surface tension during this expansion is:
A uniform wire is bent into a circle and a battery is connected across a chord that subtends an angle of 60° at the center. What is the ratio of curren...
A 10 μF capacitor is charged to 50 V and then connected across an uncharged 20 μF capacitor. What is the final potential difference across both capac...
The emission of a beta-minus particle from a nucleus results in:
Which law states that the current through a conductor is directly proportional to the voltage across it?
Relevant for Exams:
