122Chapt. 14Gravity014 qmult 00150 1 4 5 easy deducto-memory: gravitational constant6. “Let’s playJeopardy! For $100, the answer is: It is the gravitational constant with MKS unitsN m2/kg2It is actually the poorest known of the fundamental constants because gravity is sucha weak force between laboratory size objects which are used to measure it.”What is, Alex?a) 1.000...b) 2.99792458×10−8c) 2.99792458×108d) 6.67428(67)×1011e) 6.67428(67)×10−11014 qmult 00160 1 1 4 easy memory: point-like gravity law7. Newton’s classical gravity law is written for point masses. But this presents a paradox sincepoint masses, at least classical point masses (and maybe not even quantum mechanical pointmasses, but who knows) do not really exist. The paradox is resolved by regarding the law asan ideal limiting form from which actual gravitational forces between masses can be calculated.Four cases of the application of Newton’s gravity law come to mind for the situation of twoobjects.
This is the end of the preview.
access the rest of the document.