Question on Proportionate spheres (Help!!) A spherical balloon is partially blown up and its surface area is measured. More air is then added, increasing the volume of the balloon. If the surface area of the balloon expands by a factor of 9.4 during this procedure, by what factor does the radius of the balloon change? If the radius of a sphere is increased by 12 %, by what factor does its surface area increase? - By what percentage does its surface area increase? - By what factor does the sphere's volume increase? - By what percentage does the sphere's volume increase? The weight of an object at the surface of a planet is proportional to the planet's mass and inversely proportional to the square of the radius of the planet. Jupiter's radius is 11 times Earth's and its mass is 320 times Earth's. An apple weighs 1.0 N on Earth. How much would it weigh on Jupiter?