Physics

During rainy days, the moisture content is more in the atmosphere and speed or velocity of sound increases with increase in humidity. Hence the sound travels faster on rainy days.

Force of impact is the force when the object meets.

Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.

The minimum velocity required for a rocket to overcome earth’s gravity and travel into space is 11.2 km/sec.

In SI units, permeability is measured in Henry per meter (H/m).

Pitot tube is used to measure stagnation pressure.

Scuba diving players must have the knowledge of Pascal’s law.

When the wire is stretched to double the length , the area of cross section gets reduced to half. So when the wire is stretched, the resistance multiplies by four times.

When a fast-moving train passes a man standing on the platform at rest, the air between train and person also moves with greater speed. This rapidly moving air, by Bernoulli’s principle will have a lower pressure than the still air a few feet away.

Global warming is expected to result in increase in level of sea, change in crop pattern and change in coast line.