The mean diameters of X and Y, two planets in the same solar system, are 6.4 × 103 km and 1.8 x 104 km, respectively. The mass of X is 0.20 times the mass of Y. The value of g on Y is 8.4 m/s². (a) What is the ratio of the mean density of X to that of Y (px/py)? (b) What is the value of g on X? m/s² (c) The mass of Y is 1.020 x 1025 kg. What is the escape speed on X? m/s

The density of the Earth can be expressed by the equation density = C{1.22 -(r/R)}, where R is the radius of the Earth and C is a constant.  Find the expression for C in terms of total mass (M) and the radius (R)..

Iron has a density of 7.874 g/cm3, and the mass of a iron atom is 9.27 x 10-26 kg. (a) If the atoms are spherical and tightly packed, what is the volume of a iron atom? m³ (b) What is the distance between the centers of adjacent atoms? m

In the fall of 2002, scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a nuclear chain reaction. Neptunium-237 has a density of 19.5 g/cm3. What would be the radius of a sphere of this material that has a critical mass?

Schwarzschild radius RS of a black hole is the maximum distance from the black hole’s center at which light cannot escape its gravitational field. The quantity RS (with dimensions of length) is dependent on the mass of the black hole M, the speed of light c, and the gravitational constant G. Based on the dimensions of these four parameters, predict an equation for the Schwarzschild radius. Hint: G has dimensions of [L3/MT2]

Which of the following objects is most dense? O mass = 8.00 kg, volume = 0.00320 cubic meters O mass = 8.00 kg, volume = 0.00160 cubic meters O mass = 2560 kg, volume = 0.640 cubic meters O mass= 2560 kg, volume = 1.28 cubic meters O mass= 4.00 kg, volume = 0.00160 cubic meters

One molecule of water (H2O) contains two atoms of hydrogen and one atom of oxygen.A hydrogen atom has a mass of 1.0 u and an atom of oxygen has a mass of 16 u, approximately. (a) What is the mass in kilograms of one molecule of water? (b) How many molecules of water are in the world’s oceans, which have an estimated total mass of 1.4 =1021 kg?

The diameter of the spherical particle is (1.900x10^0) fm, and the mass is (2.51x10^-27) kg. Determine the density of this particle in kg/m3. Your numerical answer requires the correct number of significant digits.

One molecule of water (H2O) contains two atoms of hydrogen and one atom of oxygen. A hydrogen atom has a mass of 1.0 u and an atom of oxygen has a mass of 16 u, approximately. (a) What is the mass of one molecule of water? (b) How many molecules of water are in the world's oceans, which have an estimated total mass of 1.4 × 1021 kg?

Grains of fine California beach sand are approximately spheres with an average radius of 50 m and are made of silicon dioxide, which has a density of 2600 kg/m3.What mass of sand grains would have a total surface area (the total area of all the individual spheres) equal to the surface area of a cube 1.00 m on an edge?