The force acting on an object is 20 N. If the acceleration of the object is 5 m/s², what is the mass of the object? A. 100 kg B. 4 kg C. 25 kg D. 15 kg 相关知识点: 试题来源: 解析 B。根据牛顿第二定律 F=ma,已知力 F 为 20N,加速度 a 为 5m/s²,可得质量 m=F/...
In a physics experiment to measure the force acting on an object, which of the following should be controlled to ensure accurate results? A. The shape of the object B. The mass of the object C. The color of the object D. The position of the object ...
试题来源: 解析 A。原因:物体静止时,处于平衡状态,合力为零。B 选项大于零会使物体运动;C 选项小于零也会使物体运动;D 选项无法确定不符合静止物体的受力情况。涉及的物理知识是平衡状态,英语阅读技巧是根据“object at rest”判断受力情况。反馈 收藏 ...
In a physics experiment, the force acting on an object is 10 N and the acceleration is 2 m/s². The mass of the object is ___. A. 20 kg B. 5 kg C. 12 kg D. 8 kg 相关知识点: 试题来源: 解析 B。根据牛顿第二定律,力等于质量乘以加速度,所以质量等于力除以加速度,10 除以 2...
A. force acting on an object B. motion without force C. an object at rest D. energy without motion 相关知识点: 试题来源: 解析 A。强风可以吹动大树,这是力作用于物体的一个例子。B 选项运动不需要力是错误的;C 选项物体处于静止状态不符合题意;D 选项没有运动的能量与题目无关。反馈...
Archimedes' principle states that the buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object. If an object weighs 10 N in air and 8 N when immersed in water, what is the buoyant force acting on the object? A. 2 N B. 8 N C....
The force acting towards the center of the circle for an object moving in a circular path is called centripetal force. This force is responsible for constantly changing the object's direction, making it move in a circle without changing its speed. The force acting on an object moving in a ...
A device is used for generating a force acting on an object. The device comprises a magnetic device for generating an external magnetic field in an environment of the object and therefore for inducing a magnetic moment in the object. The magnetic device has at least two elements, which can ...
The gravitational force acting on an object at the Earth's surface is called the weight of the object. All the heavenly bodies in space like the moon, the planets and the stars also exert an attractive force on objects. The bigger and heavier a body is, the greater is its force of ...
An object is falling freely. The force acting on it is ___. A. gravity B. friction C. magnetism D. electricity 相关知识点: 试题来源: 解析 A。物体自由下落是因为受到重力的作用。选项 B、C、D 都与自由下落的物体无关。反馈 收藏