Why is hollow box provided in a guitar?

The vibrating srings force air molecules in the box to vibrate with greater amplitude to produce loud sound.

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UNIFORM CIRCULAR MOTION

In uniform circular motion, 1. Speed is constant. 2. Velocity is variable and acts along tangential direction at a point. 3. Centripetal Force and acceleration act along the radius towards the centre if the circular path. 4. Centrifugal force appears to act radially outwards. It is a virtual ,fictitious force, not a real force.

MIRAGE. HOW IS IT FORMED ?

MIRAGE is formed by the phenomenon of total INTERNAL reflection of light. Mirage is formed in extremely high or low temperature conditions. For example: When a sand surface (desert) or road surface is heated, the air above this surface is also heated and rises up. As a consequence, the density of air in the lower level is less than that of upper level. Now , the light from any object starting from the upper layers (denser medium) travels to lower layers ( rarer medium), total internal reflection takes place i.e, the light is reflected back towards the denser medium. When these light rays reflected back, it seems that the light rays are refected from some bright reflecting surfaces on the ground. Hence the image is seen below the object.

Mechanical advantage of a block and tackle system increases on increasing the number of pulleys. Give reason

Mechanical advantage of the block and tackle system of pulleys increases because the number of strands balancing the load increases.

PHYSICS

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