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What is the force that pulls objects towards the center of the Earth? A. Magnetism B. Gravity C. Electricity D. Friction 相关知识点: 试题来源: 解析 B。解析:重力是使物体向地球中心下落的力。A 选项磁力、C 选项电力、D 选项摩擦力都不是使物体向地球中心下落的力。
What is the name of the force that pulls objects towards the center of the Earth? A. Gravity B. Magnetism C. Electrical force D. Friction 相关知识点: 试题来源: 解析 A。解析:重力是使物体向地球中心吸引的力。磁力是由磁体产生的力。电力是由电荷产生的力。摩擦力是阻碍物体相对运动的力。
Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point that is sea level. The rate at which a molecule of water passes through the cycle is not random but is a measure of the relative ...
A. because of B. instead of C. in case of D. in spite of 相关知识点: 试题来源: 解析 A。本题考查表语从句。“because of”表示“因为”,句子意思是“科学已经证明地球之所以是现在这样是因为重力的作用”。表语从句在这里解释了地球现状的原因。它与主语从句不同,主语从句在句中充当主语成分。与定语...
What is gravity? A. A force that pulls things towards the center of the earth. B. A force that pushes things away from the earth. C. A force that makes things float. 相关知识点: 试题来源: 解析 A。重力是使物体向地球中心吸引的力。不是推开物体或使物体漂浮。
Gravity Is What Keeps the Earth Orbiting the Sun
The teacher asked us,“Do you know what is the shape of the earth?”We answered that we knew the earth is round and that the earth is a sphere.The teacher then asked,“Can you tell me why the earth is a sphere?”We answered that we thought it was because gravity pulls everything ...
The scientist explained to us that the force of gravity2. What scientists think is that the Earth became differentbecause of small plants growing in the water on its sur-face.3. It is obvious to the students that they should get wellprepared for their future.4. The last time we had ...
Gravity Every object in the universe attracts every other object in the universe. That was Isaac Newton's discovery with the law of universal gravitation. It's a mathematical statement of the magnitude of gravitational force. Newton's equation for universal gravitation states that the force of gra...