Consider two spring balances hooked as shown in figure. We pull them in opposite directions.If the reading shown by A is $1.5 N$,The reading shown by B will be

The mass of a plant is twice and its radius is three times that of the earth. The weight of a body, which has a mass of $5 kg$, on that planet will be

A mass of $1 \mathrm{kg}$ is tied to a string as shown in the figure.

Find the force exerted on the mass by the Earth ($\mathrm{g}=9.8 \mathrm{m} {\mathrm{s}}^{-2}$).