Sirius (A) has white dwarf companion star Sirius (B). The system is known to have a semi-major axis of 20 au and a period of 50 years. Doppler shiftsshow that at any given time Sirius (B) moves twice as fast as Sirius (A). What is the mass of Sirius (A)? What is the mass of Sirius (B)?

Lewis structure and molecular geometry for nh2cl

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

What is the atomic number of an atom that has 6 protons