This is why your bike / car's mileage is dropping #LLAShorts 311

A car and bike are moving in opposite directions on parallel tracks with speeds of 72 km/h and 60 km/h respectively. A boy sitting in car is continuously sounding a whistle of frequency 400 Hz. Calculate the frequency of sound heard by person sitting on bike (a) if car and bike are approaching each other. (b) if car and bike are moving away from each other.

Why are falling liquid drops spherical?

Why do tyres of cars wear out gradually ?

At that instant a motor bike starts from rest in a given direction, a car overtakes the motor bike, both moving in the same direction.The speed time graphs for motor bike and car are represented by OAB and CD respectively.Then

A car manufacturer usually tells a optimum speed (V_(0)) at which the car should be driven to get maximum mileage. In order to find the optimum speed for a new model, an engineer of the car company experimented a lot and finally plotted a graph between the extreme time t (defined as number of hours a tank full of petrol lasts) vs the constant speed V at which car was run. (a) Calculate the optimum speed V0 for this new model. (b) If the fuel tank capacity of this car is 50 litre, what maximum mileage can be obtained from this car?

The shapes of cars and planes are streamlined. Why?