{"product_id":"explore-alliance-presents-how-do-you-know-episode-53-finding-the-value-of-g","title":"Explore Alliance Presents: How Do You KNOW? – Episode #53: ''Finding the Value of G\"","description":"\u003cp title=\"Page 1\" class=\"page\"\u003eGravity is the weakest of the four fundamental forces, it causes\u003cspan data-mce-fragment=\"1\"\u003e causes mutual attraction between all things with mass or energy. It is  \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eapproximately 10\u003c\/span\u003e\u003csup data-mce-fragment=\"1\"\u003e38\u003c\/sup\u003e\u003cspan data-mce-fragment=\"1\"\u003e times weaker than the strong interaction, \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e10\u003c\/span\u003e\u003csup data-mce-fragment=\"1\"\u003e36\u003c\/sup\u003e\u003cspan data-mce-fragment=\"1\"\u003e times weaker than the electromagnetic force, \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eand 10\u003c\/span\u003e\u003csup data-mce-fragment=\"1\"\u003e29\u003c\/sup\u003e\u003cspan data-mce-fragment=\"1\"\u003e times weaker than the weak interaction. Gravity\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e has no significant influence at the level of subatomic particles, but it has significant interaction at the macroscopic scale, determining the motion of planets, stars, galaxies, and even light. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp title=\"Page 1\" class=\"page\"\u003eThe gravitational constant, \"G\" is a key quantity in Newton's Law of Gravitation. T\u003cmeta charset=\"utf-8\"\u003ehe existence of the constant is implied in Newton's law of universal gravitation, as published in the 1680s (although its notation as \u003cspan data-mce-fragment=\"1\" class=\"texhtml\"\u003e\u003ci data-mce-fragment=\"1\"\u003eG\u003c\/i\u003e\u003c\/span\u003e dates to the 1890s). Why does the value for \"G\" matter?  It helps us to more accurately determine orbits and the mass of any object as well as light in the universe. \u003c\/p\u003e\n\u003cp title=\"Page 1\" class=\"page\"\u003e The first direct measurement of gravitational attraction between two bodies in the laboratory was performed in 1798, seventy-one years after Newton's death, by Henry Cavendish. Since the time of Cavendish, only modest improvements to the value of G have been made.  \u003c\/p\u003e\n\u003cp title=\"Page 1\" class=\"page\"\u003eIn this 53rd edition of How Do You KNOW? Dr. Daniel Barth explains the Gravitational Constant and how the value is improved with modern methods. \u003c\/p\u003e\n\u003cdiv title=\"Page 1\" class=\"page\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cdiv class=\"page\" title=\"Page 1\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eThe activities and materials provided free for the How Do You Know? program are based upon Dr. Barth’s award-winning book:\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/scholarworks.uark.edu\/oer\/2\/\" title=\"Astronomy for Educators Free e-Book\" target=\"_blank\"\u003eAstronomy For Educators\u003c\/a\u003e. This book is used as a resource in more than 5,700 schools across the United States and in more than 50 countries world-wide. Published as an Open Educational Resource Text, it is made available from the University of Arkansas Library Press.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/explorescientificusa.com\/pages\/explore-alliance-presents-how-do-you-know-with-dr-daniel-barth\" title=\"How Do You KNOW? Index of Programs\"\u003eReturn to the How Do You KNOW? index of programs\u003c\/a\u003e.  \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"page\" title=\"Page 1\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":53211549630827,"sku":"sku-41834991091884","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0934\/3608\/4587\/files\/cavendish-top.jpg?v=1778515590","url":"https:\/\/www.nacshomedecor.com\/products\/explore-alliance-presents-how-do-you-know-episode-53-finding-the-value-of-g","provider":"NACS Home Decor","version":"1.0","type":"link"}