{"id":336434,"date":"2016-12-12T03:00:00","date_gmt":"2016-12-12T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=e80784bca03eb02992a97d2f7b7cc695"},"modified":"2016-12-12T03:00:00","modified_gmt":"2016-12-12T00:00:00","slug":"a-bullet-fired-in-dry-water-an-investigative-activity-to-learn-hydrodynamics-concepts","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=336434","title":{"rendered":"A bullet fired in dry water: an investigative activity to learn hydrodynamics concepts"},"content":{"rendered":"<p>In this paper we report an investigative activity on hydrodynamics, in the context of an<br \/>\ninquiry-based learning project. The aim is to analyse the experiment of a bullet shot underwater.<br \/>\nUsing Tracker , a video analysing and modelling software, the displacement of the bullet was<br \/>\nmeasured as function of time, processing a slow motion video from YouTube. It was found that the<br \/>\ndisplacement of the bullet is well described in the first 20\u2009ms by the inviscid flow regime, where<br \/>\nthe Newtonian drag force overcomes the viscous drag. This behaviour is discussed in the context of<br \/>\nwhat Richard Feynman\u2019s famous Lectures on Physics describes as \u2018The Flow of Dry Water\u2019 .<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this paper we report an investigative activity on hydrodynamics, in the context of an<br \/>\ninquiry-based learning project. The aim is to analyse the experiment of a bullet shot underwater.<br \/>\nUsing Tracker , a video analysing and modelling software, the d&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-336434","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/336434","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=336434"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/336434\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=336434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=336434"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=336434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}