Chapter 7, Problem 70A

To determine

The Moon’s gravitational field at its surface

Answer to Problem 70A

  $1.6{\text{m/s}}^2$

Explanation of Solution

Given:

The mass of the physics teacher is $91\text{kg}$ .

The weight of the teacher on Moon’s surface is $145.6\text{N}$ .

Formula used:

The weight of an object of mass m on the planet can be obtained by

  $W=mg$

Where, g is the gravitational strength on the planet.

Calculation:

Using the given values of the mass of the teacher and its weight, the gravitational field on the Moon will be,

  $\begin{array}{c}W=mg\text{'}\\ 145.6=91\times g\text{'}\\ g\text{'}=1.6{\text{m/s}}^2\end{array}$

Conclusion:

Thus, the gravitational field on the Moon’s surface is $1.6{\text{m/s}}^2$ .