Question

The radius of the earth is 6370Km and the radius of mars is 3440Km. If an object weights 200N on earth, what will be the gravity on mars? Mars has a mass of 0.11 times the mass of the earth.

Answer 1

hey that formula will work, just plug in the numbers and you will get Fg = 75

Answer 2

oh the formula needs radius in meters not km, maybe that will help

Answer 3

ok

Answer 4

Hey dumbcow, I deleted my last question. Can you show the work again, please

Answer 5

the answer is 75N and 3.7m/s2

Answer 6

\[g=GM/r^2\]

Answer 7

\[F = G \frac{m _{1}m _{2}}{r^{2}}\]
\[F = (6.67 X 10^{-11})\frac{(20.41)(0.11)(5.9736 X 10^{24})}{6,370,000^{2}}\]

Answer 8

what does 20.41 means?

Answer 9

mass of the object
mg = 200, where g is 9.8
m = 200/9.8 = 20.41

Answer 10

I multiplied that but I didnt get 75

Answer 11

oops i put the wrong radius
use radius from mars

Answer 12

ok let me check it out

Answer 13

I got 7.55929*10^7 when I replace the radius of mars

Answer 14

or 75.5 X 10^6 = 75/10^-6
you forgot to add the 3 zeroes to radius to convert it to meters

Answer 15

Yeah I got 75 finally

Answer 16

\[g(earth)/g(mars)=[M(earth)x/r^2(earth)] X [r^2(mars)/M(mars)]\]

Answer 17

what does that formula means. Does that do the same?

Answer 18

Then 75 = mg
75 = 20.41g
3.67 = g

Answer 19

Thanks dumbcow

Answer 20

still want to know what does that formula means SmRoberts. Please tell me

Answer 21

\[g = GM/r^2\] where G is the universal constant of gravitation
M is mass of the planet
r is the radius of the planet

Answer 22

did you get 75N?

Answer 23

yes i did

Answer 24

We Wm
--= ----
ge gm

Wm=(200/9.8)3.7=75N

Answer 25

did u get it emunrra?

Answer 26

Mm/Me 6.5736x10^23kg/5.976x10^24
gm=---------=------------------------------=3.7m/s answer
(rm/re)^2 (3440km/6370km)^2

Answer 27

yes, I did. Thanks. This procedure is clearer :)

Answer 28

ok good luck to you..lol

Answer 29

How do I get gm??? what is the original equation?

Answer 30

please help me. I dont get it