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?

Since neutron stars consist totally of neutrons, they are extremely massive and have a density that is hard to imagine. A typical radius and mass for a neutron star are 2.00 x 103 m and 4.00 x 1048 kg respectively. (a) Determine the density of a neutron star. kg/m3 (b) Determine the weight (in pounds) of a penny (V = 360 mm) if it were made from this material. (Assume 1 lb = 4.448 N.) Ib

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

Since neutron stars consist totally of neutrons, they are extremely massive and have a density that is hard to imagine. A typical radius and mass for a neutron star are 1.30 x 10³ m and 3.60 x 1028 kg respectively. (a) Determine the density of a neutron star. kg/m³ (b) Determine the weight (in pounds) of a penny (V = 360 mm³) if it were made from this material. (Assume 1 lb = 4.448 N.) lb

Recall that density is massdivided by volume A neutron star is the remnant of certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 km in diameter and have about the same mass as our sun. What is a typical neutron star density in g>cm3?

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.