Question

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

Answer 1

The answer is:
B. 5 lbs

Answer 2

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

`(20)/( 42)=(x)/(10.5)\\\\\Rightarrowx=(20)/(42)*10.5=5\text{ lbs}`

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