If the average density of planet x is equal to earth's average density, ρe, what is the ratio of rx/re, where re is the mean radius of earth

Gravity due to any planet on its surface is given by

here we have

Now since the gravity due to both planets are same

now we have

so above is the ratio of the radius

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.