Gravity and Energy: Attraction & Velocity

In summary, the most effective way to freeze boiling water using liquid nitrogen would be to spray it from above while the bucket is placed on the grass. Gravity does not travel, but gravitational waves propagate at the speed of light and are responsible for the pull of gravity. Cooling fluids from above is more efficient as cooler fluid is more dense and will sink to the bottom.
  • #1
rave77
4
0
I have the following question:

Let's suppose that I have a bucket filled with boiling water (metal bucket), and I intend to freeze the water by spaying liquid nitrogen to it.
Which of this two would be the most effective way to achieve my goal:
Placing it on the grass and spraying it from above? Or from below hanging and covering the bucket with a block of grass? (The exact same block of grass is used in both cases).

This is a different question; if you could help me answer it I would appreciate it.
A friend of mine asked me:
How fast does gravity travel.
I told him that gravity does not travel, all matter in this universe is connected, no matter how far apart they are from each other.
Then he asked me the following question:
If a particle starts traveling at a great velocity heading towards another. How fast would the attraction increase as they both shorten the distance among them?
 
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  • #2
Gravitational waves propagate at the speed of light. If an object you are gravitationally pulled to moves, there is a speed-of-light delay before gravitational pull changes.

Usually, cooling fluids from above is more efficient, as cooler fluid is more dense and will sink to the bottom, mixing the fluid you are cooling.
 
  • #3
K^2 said:
Gravitational waves propagate at the speed of light. If an object you are gravitationally pulled to moves, there is a speed-of-light delay before gravitational pull changes.

Usually, cooling fluids from above is more efficient, as cooler fluid is more dense and will sink to the bottom, mixing the fluid you are cooling.

This response might be a bit misleading to the original poster, I just wanted to clarify a little bit (unless I am the one being misleading and am incorrect here) there is a difference between gravity itself as a force and gravitational waves.

Gravitational waves also travel at the speed of light, but they are an actual distorting of spacetime for example orbiting black holes creating gravity waves/gravity radiation.

Gravity itself as an attractive force or gravitons also travel at the speed of light though, and this is what is responsible for the pull of gravity. I do not believe it is gravitational waves that cause massive objects to be attractive.
 

Related to Gravity and Energy: Attraction & Velocity

1. What is the relationship between gravity and energy?

The relationship between gravity and energy is that gravity is the force that attracts objects towards each other, while energy is the ability to do work. In the context of gravity, energy is needed to overcome the force of gravity in order to move an object.

2. How does gravity affect the velocity of an object?

Gravity affects the velocity of an object by constantly pulling it towards the center of the Earth. This means that unless there is a force acting in the opposite direction, such as thrust from an engine, the velocity of an object will decrease as it falls towards the Earth.

3. What is the difference between gravitational potential energy and kinetic energy?

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, while kinetic energy is the energy an object possesses due to its motion. As an object falls towards the Earth, its potential energy decreases and its kinetic energy increases.

4. How does the mass of an object affect the force of gravity?

The mass of an object directly affects the force of gravity. The greater the mass of an object, the greater the force of gravity it exerts on other objects. This is why larger objects, such as planets, have a stronger gravitational pull than smaller objects, such as asteroids.

5. Can gravity be manipulated or harnessed as a source of energy?

While gravity cannot be manipulated or harnessed directly, there are ways to use the force of gravity to generate energy. For example, hydroelectric power plants use the force of gravity to turn turbines and generate electricity from the movement of water. However, this is not a direct manipulation of gravity, but rather a utilization of its effects.

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