पृथ्वी और चंद्रमा के बीच गुरुत्वाकर्षण खिंचाव होता है। चंद्रमा को पृथ्वी की ओर खींचने वाला बल _____________ होता है।

On Earth, g ≈ 9.8 m/s2. If an object is moved to a location where g = 0, its mass:

The force with which the Earth attracts an object is called:

Two stars of masses m and 2m at a distance d rotate about their common centre of mass in free space. Their period of revolution is: