# Physics

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The artist Anya Calderona constructs the mobile shown in the figure.(Figure 1) In the illustrated configuration, the mobile is perfectly balanced. Assume the strings and crossbars are massless.

If Anya decides to make the star twice as massive, and not change the length of any crossbar or the location of any object, what does she have to do with the mass of the smiley face to keep the mobile in perfect balance? Note that she may have to change masses of other objects to keep the entire structure balanced. Choose one of the option below:
- make it eight times more massive
- make it four times more massive
- make it twice as massive
- nothing
- impossible to tell

• Physics -

Twice as massive.

• Physics -

Make it twice as massive

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