C. Magnetic force. D. Frictional force. 相关知识点: 试题来源: 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...
A. Makes the earth spin B. Attracts iron and steel C. Makes the sun shine D. Helps plants grow 相关知识点: 试题来源: 解析 B。本题考查对地球磁场作用的了解,地球磁场能吸引铁和钢。A 选项地球自转不是磁场的作用;C 选项太阳发光不是磁场的作用;D 选项帮助植物生长不是磁场的作用。反馈...
there are rare man-made material mixtures that are conducive to becoming electromagnetic by being exposed to a strong magnetic field and holding an electromagnetic charge for long
Not just any material can be magnetic. In fact, of all the known elements, only a handful possess magnetic capability and they vary by degree. The strongest magnets are electromagnets, which gain their attractive force only when current passes through them. Current is the movement of electrons,...
What makes magnetic skyrmions different from magnetic bubblesdoi:10.1016/J.JMMM.2018.06.058Andrei B. BogatyrvKonstantin L. MetlovNorth-Holland
What makes an object magnetic according to the Pauli exclusion principle? What fundamental forces cause cohesion? What property of matter is momentum related to? What causes seismic waves to reflect? What effects gravitational force? What is the Archimedes' principle equation? What are the properties...
So if magnetic fields are just weird relativistic effects, then where do magnetic poles, bar magnets, and whatnot come from? So far we’ve got that current flowing in the same direction down two wires makes those wires attract, and current flowing in opposite directions makes them repel. To...
It may not always turn into a sale right away, but it makes HubSpot top of mind when it comes to marketing. That’s a powerful position to be in. Answering questions is an underrated component of content marketing. Just be helpful. And if you can do that in a creative w...
HUAWEI Pura 70 Series features an Ultra Speed Snapshot function. Simply press the shutter button to capture a clear photo of a moving object, which is very useful when your pet is playing. When you're at a distance from a moving subject, the main camera and telephoto cameras on HUAWEI Pu...
Theelectromagnetic radiationof an object is stretched out slightlyinside a gravitational field. Think of the sound waves that emanate from a siren on an emergency vehicle; as the vehicle moves toward an observer, sound waves are compressed, but as it moves away, they are stretched out, orredsh...