Is it except the center of mass, the other part of the object do not have weight ?
why when we do the calculations , we always neglect the other part out of the center of mass ?

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus