momentum是什么意思？

Whether it's a sports team or a presidential campaign, everybody relishes having the big momentum, because it makes them harder to stop or change direction.

When you hear people speaking of making a rapid transition toward any type of energy, whether it is a switch from coal to nuclear power, or a switch from gasoline-powered cars to electric cars, or even a switch from an incandescent to a fluorescent light, understanding energy system inertia and momentum can help you decide whether their plans are feasible.

Unfortunately for them ( ' , and often the taxpayers), our energy systems are a bit like an aircraft carrier: they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia ( ' , meaning it takes a lot of energy to set them moving), and they have a lot of momentum once they are set in motion.

So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once be is moving, it is hard to change his state of motion.

One kind of momentum is technological momentum.

Once you have started the boulder rolling, it develops momentum, which is defined by its mass and velocity.

Not only moving objects and people but all systems have momentum.

Momentum is said to be conserved.

In physics, moving objects have two characteristics relevant to understanding the dynamics of energy systems: inertia and momentum.

Energy.systems, like an aircraft carrier set in motion, have huge momentum.

By far the biggest type of momentum that comes into play when it comes to changing our energy systems is economic momentum.

But there are other kinds of momentum as well.

But the momentum of incandescent lighting does not stop there.

Another type of momentum we have to think about when planning for changes in our energy systems is labor- pool momentum.

After all, we don't speak only of objects or people as having momentum; we speak of entire systems having momentum.

Another type of momentum we have to think about when planning for changes in our energy systems is labor-pool momentum.

In physics, moving objects have two characteristics relevant to understanding the dynamics of energy systems: inertia and momentum .

Momentum is said to be "conserved", that is, once you build it up, it has to go somewhere.

So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once he is moving, it is hard to change his state of motion.

Unfortunately for them and often the taxpayers, our energy systems are a bit like an aircraft carrier : they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia meaning it takes a lot of energy to se

When you hear people speaking of making a rapid transition toward any type of energy, whether it is a switch from coal to nuclear power, or a switch from gasoline -powered cars to electric cars, or even a switch from an incandescent to a fluorescent light