Why are brake pads used in car braking systems ?

Why are manure and fertilizers used in fields?

Explain why are pressue in a car tyre increases during driving ?

Why vinegar is used in pickling?

Why lipase are used in detergents?

The makers of a certain motor car state that if the brakes are applied fully on a dry level road at 48 kmph, the vechicle will stop in 13m. A motorist while driving one of these cars on a level road was involved in an accident. However, if he claimed that he was proceeding at 32 kmph, and he had stopped in 3m after applying the brakes, then justify whether the claim was right or wrong.

A train wagon is attached to the engine through a shock absorber 1.5 m long the system having a total mass of 5 x 104 kg is going at a speed of 36 km/h. Suddenly the brakes are applied to bring them to rest. In the process of coming to rest, the spring of the shock absorber gets compressed by 1 metre. If only 90% energy of the wagon is lost due to friction. What is spring constant of spring?

Why silicon carbide is used as an abrasive?

Explain the terms 'range ' and ' band width ' used in electronic communication systems.