Question

The weight of a body would not be zero:
(a). At the center of the earth
(b). During a free fall
(c). In interplanetary space
(d). At the surface of the earth

Answer 1

- Hint: Weight is the force on an object due to gravity and it is given by $W = mg$ and the mass is a measure of the amount of matter contained in a body . It is a fundamental property of the object and is hence a constant quantity.

Complete step-by-step solution -

Weight of a body is the gravitational force exerted on the body.
At the surface of the earth the value of gravitational energy is $9.8N$. Thus on the surface of the earth a body weighing $1kg$ has a weight equal to $9.8N$ independent of its state of motion.
Hence a body at the surface of the earth cannot be zero since the value of $g$ at earth surface is $9.8N$.

Note: Here understand it by the air velocity can be measured by sensing the pressure produced by the movement of the air. This application note will describe the basic relationships between air velocity and the pressure generated by air flow. Anyone who put their hand out the window of a moving car has experienced the force applied by moving air.