2 A hot-air balloon rises vertically at a constant speed. At time t= 0, a ball is released from the balloon.Fig. 2.1 shows the variation with time t of the ball's velocity v.20v/m s1100234t/s-10-20一Fig. 2.1The ball hits the ground at t= 4.1 s.(a)State the speed of the...
选项 A“denser than the cold air”比冷空气密度大,热空气应密度小才会上升。选项 B“less dense than the cold air”比冷空气密度小,所以会上升,符合。选项 C“at the same density as the cold air”与冷空气密度相同,不会上升。选项 D“not related to density”与密度无关,不符合物理规律。
A hot air balloon rises when it is heated because the heat increases the kinetic energy of the molecules in the balloon and this leads to the air...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough...
A red hot air balloon rises above the treetops during Colorado's Balloon Classic,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百
Serengeti National Park - Large herd of Zebras as a hot air balloon rises in the air,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长
th e ai r.vop Gore T h e Bur Fanch skirt ner Popar e Tanks.T h e unit-Dasket44which pu shes the heat up i nto th e e nvelope T h e Bas ket Wher e th e passen gers and pilot stan dT h e basis o f how th e balloon works is that w armer air rises in cooler air...
1.A.推理判断题.由第一段"The basis of how the balloon works is that warmer air rises in cooler air.第二段The burner uses propane gas to heat up the air in the envelope to move the balloon off the ground and into the air.第三段To move the balloon upwards, the pilot opens up the ...
A hot air balloon is made up of 3 main parts: The Envelope The actual fabric balloon which holds the air. The Burner The unit which pushes the heat up into the envelope The Basket Where the passengers and pilot stand The basis of how the balloon works is that warmer air rises in coole...
A blue hot air balloon rises into the sky on a bright summer morning.,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招
function of the nose deforming into an irregular shape and then continually changing. A later addition was a curtain to split the forward and rear compartments of the envelope as if you added a lot of heat and got into a nose high attitude the nose would keep rising (hot air rises......