Question

Homework #1 Ch. 1 Introductory Concepts and Definitions Due 1/29/2018 ME 3513-02 PROBLEM 2 A 165 Ibm astronaut took his bathroom scale (a spring scale, measures weight) and a beam scale (measures mass) to the moon where the local gravity is g 5.48fis. Determine the value that will be displayed on the moon using (a) the spring scale and (b) the beam scale. (c) What is the astronaut's moon-weight from the spring scale in the SI system? 0

Answer 1

An astronaut took his scales with him to space. It is to be determined how much he will weigh on
the spring and beam scales in space.

Analysis

(a) A spring scale measures weight, which is the local gravitational force applied on a body:

w=mg=165*5.48*1/32.2=28.080 lbf

(b)

A beam scale compares masses and thus is not affected by the variations in gravitational acceleration.
The beam scale will read what it reads on earth,

W = 165 lbf

(c) The astronaut's moon-weight from the spring scale in SI unit system

W = 124.90 N