A P Shreelatha and Neetu Singh Solutions for Chapter: Gravitation, Exercise 3: EXERCISES

The value of gravitational constant G on the surface of the moon is _____ $\times {10}^{-11} \mathrm{N} {\mathrm{m}}^2 {\mathrm{Kg}}^{-2}$.

What is the value of acceleration due to gravity on the moon upto $3$ decimal units in $\left(\mathrm{m}/{\mathrm{s}}^2\right)$?
(Write only value)

What is the mass (in $\mathrm{kg}$) of an object whose weight is $49$ newton's? (Given: acceleration due to gravity is $9.8 \mathrm{m} {\mathrm{s}}^{-2}$)

A body weighs $120 \mathrm{N}$ on earth. Find its weight in newton on moon.

The force of gravitation between two objects of masses $50 \mathrm{kg}$ and $120 \mathrm{kg}$ respectively kept at a distance of $10 \mathrm{m}$ from one another is $4.02\times {10}^{-n} \mathrm{N}$. Find the value of $n$. 
(Gravitational constant, $G = 6.7\times {10}^{-11} {\mathrm{Nm}}^2/{\mathrm{kg}}^2$)

A ball thrown upwards attains a maximum height in $5 \mathrm{s}$. Find the velocity with which it was thrown?

(Choose from the following: $49 \mathrm{m}/\mathrm{s}, 4.9 \mathrm{m}/\mathrm{s}, 98 \mathrm{m}/\mathrm{s}, 9.8 \mathrm{m}/\mathrm{s}$)

Calculate the force of attraction (in newton) between the car (mass $=1000 \mathrm{kg}$) and the earth. Given mass of the earth $=6\times {10}^{24} \mathrm{kg}$; radius of the earth $=6.4\times {10}^6 \mathrm{m}$; $G=6.67\times {10}^{-11} \mathrm{N} {\mathrm{m}}^2 {\mathrm{kg}}^{-2}$.

(Choose from $9770.5 / 0.0015$)

Find the value of acceleration due to gravity on the surface of the moon in $\left({\mathrm{ms}}^{-2}\right)$. Mass of the moon = $7.35\times {10}^{22} \mathrm{kg}$, Radius of the moon = $1.74\times {10}^6 \mathrm{m}$, G = $6.67\times {10}^{-11}{\mathrm{Nm}}^2{\mathrm{kg}}^{-2}$.