An astronaut weighs 170 pounds on Earth but only 68 pounds on Mars. While visiting the planet, the astronaut removes a rock sample that weighs 25 pounds on Mars. What is the weight of the rock sample on Earth?
Help me solve.

Question

An astronaut weighs 170 pounds on Earth but only 68 pounds on Mars. While visiting the planet, the astronaut removes a rock sample that weighs 25 pounds on Mars. What is the weight of the rock sample on Earth?
Help me solve.

anonymous · Answer

@amistre64 @heather040200 @marissalovescats @loujoelou

chmvijay · Answer

68 pounds on mars = 170 pound on earth 
then 25 pounds on earth =170*25  /68  =62.5

anonymous · Answer

but that's not one of my  choices.

chmvijay · Answer

what is ur choice

anonymous · Answer

a. 0.22
b. 4
c. 0.5
d. not enough info.

anonymous · Answer

I need to understand HOW to do it because if I don't I'd be lost on ALL my other questions.. & It's really important I pass this..

chmvijay · Answer

the units are in pounds only right

amistre64 · Answer

mg1 = 170

m = 170/g1  , what is gravity in terms of lbs?  i forget the ratio

mg2 = 68

m = 68/g2

170/g1 = 68/g2 ;  therefore g2 = 68g1/170

anonymous · Answer

yes, I am guessing because it says pounds.

anonymous · Answer

@amistre64 what?

amistre64 · Answer

theres enough info if you can recall g1 in proper terms

anonymous · Answer

okay, can one of you please just explain to me how to do this? :) please.

amistre64 · Answer

F = ma,  where a is the acceleration of gravity on the planet

this is usually expressed in terms of Newtons;  or kg-m/sec^2

anonymous · Answer

@chmvijay Thank you, I didn't notice you explained thanks.

amistre64 · Answer

1 newton is equal to .2248 lbs per foot

anonymous · Answer

That was a choice sorry whoops. :)

chmvijay · Answer

LOL what was choice

anonymous · Answer

LOL, yeah thanks !

chmvijay · Answer

but i didnt get what ur options are wrong u inserted here

anonymous · Answer

I know because I was looking at the wrong answer choices.

anonymous · Answer

An astronaut weighs 170 pounds on Earth and 400 pounds on Jupiter. The astronaut captures an alien that weighs 120 pounds on Jupiter. What is the alien's weight on Earth?

chmvijay · Answer

hey @amistre64  even if u calculate by that method also the same answer you will get :)
i got ur point u wanted to find gravitation on mars bases on other :)

anonymous · Answer

would that be 283?

chmvijay · Answer

nope

anonymous · Answer

400 lbs = 170 lbs 
120 lbs = 400x120/170
= 282.3529....
rounded 283.@chmvijay

anonymous · Answer

help please. :(

chmvijay · Answer

400 weighs on Jupiter =170 on earth
120 weight on Jupiter =170*120  /400

anonymous · Answer

Thats the way to solve these questions? That method always?

chmvijay · Answer

yup :)

chmvijay · Answer

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