The sun rises in the east and sets in the west. Why does this happen? A. Because the earth rotates. B. Because the sun moves around the earth. C. Because of the gravity. D. Because of the wind. 相关知识点: 试题来源: 解析 A。解析:太阳从东边升起西边落下是因为地球自转。选项 B ...
Gravity is a force that attracts two objects. Many people think of Sir Isaac Newton and how he watched an apple fall from a tree when we think of gravity. Gravity does not just relate to falling objects, but is also a force that pulls and keeps objects where they belong....
Why is gravity so heavy?GravityGravity or the force due to gravity is defined as the product of the masses of two particles over the distance between then. It is mathematically expressed as {eq}F_g = \frac{Mm}{r^2}{/eq} where {eq}F_g{/eq} is the force due to gravity, {eq}M...
2. What would happen if the gravity on Earth was suddenly turned off? Supposing we could magically turn off gravity. Would buildings and other structures(建筑物)float away? What happened would depend on (依靠) how strongly the things were attached (吸附) to the earth. The earth is moving ...
that's why reactions happen. We can drive reactions in the opposite way by moving energy from one place to another, but even the application of work results in energy cost somewhere else. You might then be encouraged to ask why does the universe approach a state of maximum energy dispersal...
Earthquake Damage: The ground beneath us is constantly moving due to plate tectonics. In some regions, earthquakes are severe enough to cost hundreds of billions of dollars in damages. Answer and Explanation:1 Buildings may collapse during earthquakes for a variety of reasons. If the earth split...
they often have some strange predictions, like magnetic monopoles or that protons will eventually decay into positrons-plus-photons, which we've never actually seen happen. So it's very hard to endorse these theories at this stage. So-called "theories of everything" incorporate gravity as well...
D. Luckily, there are things that people can do to prevent shrinking. E. The kids spend the rest of the movie as tiny people who are barely visible while trying to getback to their normal size. E But why does shrinking happen at all ...
the cosmological constant does get significant on larger scales, at least gravity will provide us with an answer why. Quote devin553344 Members 556 Posted April 5, 2019 (edited) On 4/6/2019 at 12:59 AM, Dubbelosix said: No, the cosmological repulsive energy only needs to be ...
we say older people shrink,we don't mean they become tiny enough to fit in your pocket!We just mean that it's common for older people to become a little shorter over time.This kind of shrinking can't be stopped,although people can slow this process.But why does shrinking ...