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The mass of an object on jupiter varies directly with its mass on earth. a rock that weighs 20 lbs on earth would weigh 42 lbs on jupiter. How much would a rock that weighs 10.5 lbs on jupiter weigh on earth?

A. 2.1 lbs
B. 5 lbs
C. 21.2 lbs
D. 22.1 lbs

Respuesta :

RyanL
The answer is:
B. 5 lbs
JeanaShupp

Answer:-The mass of a rock weighs 10.5 lbs on Jupiter weighs 5 lbs on earth.


Explanation:-

Given:-  The mass of an object on Jupiter varies directly with its mass on earth.

Let the mass of a rock weighs 10.5 lbs on Jupiter weighs x lbs on earth.

Then by direct proportion, we have

[tex]\frac{20}{ 42}=\frac{x}{10.5}\\\\\Rightarrowx=\frac{20}{42}\times10.5=5\text{ lbs}[/tex]

Thus the mass of a rock weighs 10.5 lbs on Jupiter weighs 5 lbs on earth.

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