解析 B。解析:文章中提到“When an object is placed in water, it experiences an upward force called buoyant force. If the buoyant force is greater than the weight of the object, the object will float.”,所以使物体漂浮的力是浮力。反馈 收藏 ...
Buoyancy(浮力): What makes a boat float? What are the characteristics of water that help a boat to float? How do boat design and construction make it suitable for sea voyage? This educational program focuses on the science of buoyancy and uses construction skills to judge the students’ abili...
What Makes Things Float?: Two young boys learn why and under what conditions an object will float in water. For elementary and junior high school grades.
But there are many things to know about scuba diving before you backroll into the deep blue. From FAQ's to equipment, accessories, and diving cameras necessary for an unforgettable underwater escapade, find out everything you need to know here. Let's dive in! What is Scuba Diving? Scuba ...
Exercise is an important part of every astronaut’s daily life to prevent muscle loss (肌肉萎缩). Usually, astronauts exercise two hours every day. Lifting 200 pounds on the earth may be a lot of work. But lifting t...
A. sink in the water B. move up and down in the water C. stay on the surface of the water D. swim quickly in the water 相关知识点: 试题来源: 解析 C。“float in the water”意思是漂浮在水中,也就是停留在水面上,即“stay on the surface of the water”。A 选项是沉入水中,B 选项...
What is different between them? A. One can carry toys and one can float. B. Both can carry toys. C. Both can float. D. One can fly and one can swim. 相关知识点: 试题来源: 解析 A。本题考查玩具火车和玩具船的不同功能,玩具火车能运载玩具,玩具船能浮在水面上。
Explain why an object in water always appears to be at a depth shallower than it actually is. Why will a sinking ship often turn over as it becomes immersed in water? Hydroelectricity is generated by storing water behind a dam, and then letting some of it run through generators in the da...
Cohesion.The molecular entities that make up a liquid attract each other to varying degrees due to the intermolecular forces that bind them together. Cohesion can be seen in a liquid's surface tension, which is what holds water together in drops or makes it possible to float a pin on its ...
(A)29.-What ___if you pour oil on water?-It___. A. will happen; will float B. will happen;floats C. happens;floats D. happens; will float 相关知识点: 试题来源: 解析 答案见上-如果你把油倒在水里会发生什么?-它会漂浮上来。找到标志词,正确判断时态,结合题意,给出答案。