anonymous one year ago A newly discovered planet has a mass 1.5 times compared to that of the earth, and its diameter is 3 times compared to earth. What is the gravitational acceleration on this planet?

1. welshfella

now this is a formula i have definitely forgotten

2. anonymous

Fg = Gm1m2/r^2

3. anonymous

or Fg = Gm/r^2

4. welshfella

oh ok so n1 amd m2 are the masses and r^2 = radius?

5. anonymous

yes ;)

6. welshfella

G is the acceleration due to gravity?

7. anonymous

G = 6.67 X10^-11

8. anonymous

yes :)

9. welshfella

I'm not entirely clear about it and i haven't the time to look it up . sorry

10. anonymous

oh it's okay thank you :)

11. anonymous

can you help me @ganeshie8 :)

12. IrishBoy123
13. anonymous

$mg=G \frac{Mm}{r^2}$ $g=G \frac{M}{r^2}$$g \alpha \frac{M}{r^2}$ $\frac{g'}{g}=\frac{\frac{M'}{r'^{2}}}{\frac{M}{r^2}}$$g'=g \frac{M'r^{2}}{Mr'^{2}}$ M'=Mars of new planet r'=radius of new planet M=mass of earth r=radius of earth Also given $M'=1.5M$ for the radius also u can calculate