यदि किसी ग्रह का द्रव्यमान दोगुना हो जाता है और उसकी त्रिज्या समान रहती है, तो उसका पलायन वेग (escape velocity) किस प्रकार परिवर्तित होगा?

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: