After looking at where the isogravitational point between the Earth and the moon was, I thought about practically what sort of speed you would want to cross it at.
Of course, if time is not a factor, I imagine you would ideally want to expend as little fuel possible in getting from planet to...
Given that density of solid part of rock is 2500kg/m^3, water is 1000kg/m^3, air has neglibile density and the whole object weighs twice is much in air than in water:
Apparent weight = m(object in air)*g - m(fluid displaced)*g
1/2*m(object in air)*g = m(object in air)*g - m(fluid...
Homework Statement
A geologist thinks a rock is hollow. The rock weighed in air is twice as much as when it's in water. Find the fraction of the rock's volume that is solid given the solid part of the rock is 2500kg/m^3 and water is 1000kg/m^3
Homework Equations
rho = mass/volume
Fb...