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。与定语从句的区别在于定语从句...
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 grea...
This force of attraction is known as the force of gravity. 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 bigg...
What is the force that keeps the planets in orbit around the sun? A. Gravity B. Magnetic force C. Electrical force D. Friction 相关知识点: 试题来源: 解析 A。引力使行星围绕太阳运行。选项 B 磁力不是使行星围绕太阳运行的力。选项 C 电力不是使行星围绕太阳运行的力。选项 D 摩擦力不是使行星...
physic物理问题英文6A.calculate the force of gravity on a 65-kg person in the following:a.at the surface of the Earth (R=6400km)b.at twice the Earth's radiusc.at four times the Earth's radiusB.Plot this gravitational force with distance.What pat
physic物理问题英文6A.calculate the force of gravity on a 65-kg person in the following:a.at the surface of the Earth (R=6400km)b.at twice the Earth's radiusc.at four times the Earth's radiusB.Plot this gravitational force with distance.What pat
A 10 kg brick and a 1 kg book are dropped in a vacuum. What is the force of gravity on the 10 kg brick? What is the earth weight of a 15 kilogram mass? What is the weight of a 0.2 kg toy on or near the surface of the Earth in newton? (g ...
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The force of gravity acting on an object is also that object's weight. When you step on a scale, the scale reads how much gravity is acting on your body. The formula to determine weight is [source: Kurtus]: weight = m x g where m is an object's mass, and g is the acceleration...
mechanics need to distinguish the different meanings of gravity also by using the adequate unit in the SI system. In fact the intensity of the gravity field (the force acting on the unit mass) with the unit N/kg is the generally needed quantity instead of the acceleration. Its use will ...