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originally posted by: neutronflux
If you missed it… “ The drops fall down the window only when they're too heavy for the adhesive forces to keep them in place (when the gravitational force pulling them down is greater than the adhesive force holding them up).”
You imply it’s a function of time, which is total BS.
The drop only falls when it gains sufficient mass to create enough weight from the downward pull created by gravity. When enough water pools in the drop.
originally posted by: neutronflux
Mass cannot overcome a force. It’s not a force. Only gravity acting on mass gives mass weight.
originally posted by: neutronflux
If it’s about “density”. Why would hanging 10 tons of feathers in a fabric basket off a 200 lbs hanging scale (as in the scale is only rated to weight 200 lbs) cause the steel spring to stretch straight and break?
a reply to: turbonium1
What do you think causes a HELIUM BALLOON to rise upward into the air? The balloon itself has more mass and density than air, but when filled with a gas like helium, it has LESS mass and density than air does, so that's why it RISES in air, instead of falling down through the air, like most objects do.
Thanks for proving my argument.
Hardly a valid comparison, even though I know what you're trying to say - that we are able to ignore/block out constant stimuli, like a noise or smell, when around them long enough, or every day. However, we still DO smell and hear them, no matter HOW long we're around them. We can only 'block them out' to various degrees.
originally posted by: dragonridr
Gravity causes the air at the ground to be denser than the air that is higher. In other words the higher you go the thinner the air gets. Helium is called a "lighter than air" gas, because it is less dense than air. Helium balloons rise because of a force called buoyancy. Yes, the same force that causes boats to float. This is what I meant by according to you we should be able to increase air pressure and cause things to float. But reality doesn't work that way because gravity is still there to restrain them. So the only reason helium rises are because gravity causes air to be denser at ground level.
originally posted by: Freeborn
a reply to: turbonium1
Sorry to be a pain but you still haven't attempted to explain your tidal 'theory'.
As far as I can make out you have alleged/believe that earth land masses somehow float on a body of ocean water.
These land masses bob up and down in this body of water and the displaced water causes the tides.
We can somehow predict when these land masses bob up and down, by how much and exactly how much water they displace as we can predict these tides and how high/low they will be, wherever they occur all around the world, with alarming accuracy.
But as of yet we have absolutely no explanation of how these land masses float in water and what causes them to rise up and down in this body of water.
'Don't know, God did it' isn't really an acceptable answer.
As a slight aside; what does the body of ocean water rest on?
Yes, it only falls after that, which is a function of time, right?
Please get your story straight before you post it.
Adhesives (glues)
www.explainthatstuff.com...
Next time it rains, watch how the water behaves. See how the rain naturally clumps into droplets (because of cohesion), which remain on the glass (because of adhesion). The drops fall down the window only when they're too heavy for the adhesive forces to keep them in place (when the gravitational force pulling them down is greater than the adhesive force holding them up).
But it can't 'pull down' anything,
A spring scale or spring balance or newton meter is a type of mechanical force gauge or weighing scale. It consists of a spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position. Therefore, the scale markings on the spring balance are equally spaced.
en.m.wikipedia.org...
Assuming your magical force DID exist, it would 'pull down' ALL of the air above Earth to the surface, so it already fails to work... not that it ever did, anyway!
Gas laws, laws that relate the pressure, volume, and temperature of a gas. Boyle’s law—named for Robert Boyle—states that, at constant temperature, the pressure P of a gas varies inversely with its volume V, or PV = k, where k is a constant. Charles’s law—named for J.-A.-C. Charles (1746–1823)—states that, at constant pressure, the volume V of a gas is directly proportional to its absolute (Kelvin) temperature T, or V/T = k. These two laws can be combined to form the ideal gas law, a single generalization of the behaviour of gases known as an equation of state, PV = nRT, where n is the number of gram-moles of a gas and R is called the universal gas constant. Though this law describes the behaviour of an ideal gas, it closely approximates the behaviour of real gases. See also Joseph Gay-Lussac.
www.britannica.com...
it would 'pull down' ALL of the air above Earth to the surface,
Anyway, I don't have a theory for the tides, I mentioned someone who did have this theory, which seemed to make sense to me, so far.
But that wouldn't work, because they'd also have to explain why the waters of Earth don't spill off it's edges.
Bird Point Bore Tide Table | Beluga Point Bore Tide Table
The bore tide is a spectacular sight, a wave up to 10 feet high, that thunders into Turnagain Arm just south of Anchorage in the right tide conditions. You can easily see this dramatic show of nature’s power from the Seward Highway using our guidelines below.
What Are Bore Tides?
The bore tide is a rush of seawater that returns to a shallow and narrowing inlet from a broad bay. Bore tides come in after extreme minus low tides created by the full or new moon.
Bore tides occur all over the world—there are around 60 of them—but only a few are large enough to make a name for themselves. One in China, for example, stretches almost 30 feet tall and travels more than 20 miles per hour. Alaska’s most famous bore tide occurs in Turnagain Arm, just outside Anchorage. It builds up to 6 – 10 feet tall and can reach speeds of 10 to 15 miles per hour. It takes not just a low tide but also about a 27-foot tidal differential (between high and low tide) for a bore to form in Turnagain Arm.
www.alaska.org...
originally posted by: dragonridr
a reply to: neutronflux
changes in seal level damn them seals. Biden is that you i saw your speech on klu klux clams. nothng worse then stacking seals and racist clams. Ok sorry i saw seal level and you made me shoot coffee out my nose. I know it was a typing error but it was funny I imagined seals stacking up on beaches when the moon is overhead.
originally posted by: turbonium1
originally posted by: Freeborn
a reply to: turbonium1
Sorry to be a pain but you still haven't attempted to explain your tidal 'theory'.
As far as I can make out you have alleged/believe that earth land masses somehow float on a body of ocean water.
These land masses bob up and down in this body of water and the displaced water causes the tides.
We can somehow predict when these land masses bob up and down, by how much and exactly how much water they displace as we can predict these tides and how high/low they will be, wherever they occur all around the world, with alarming accuracy.
But as of yet we have absolutely no explanation of how these land masses float in water and what causes them to rise up and down in this body of water.
'Don't know, God did it' isn't really an acceptable answer.
As a slight aside; what does the body of ocean water rest on?
It rests on land, deep below it.
Anyway, I don't have a theory for the tides, I mentioned someone who did have this theory, which seemed to make sense to me, so far.
All I DO know for sure, is that it is NOT explained by 'gravity' from the moon and/or Sun, for several reasons, so that's why I'm looking into other theories for it, one of which I posted, but I've yet to look into the whole issue.
It's better to say you don't know what causes the tides, or don;t know for sure what causes them, than to keep claiming 'lunar gravity' or whatever causes it, because that's complete BS. Even if 'gravity' DID exist, it doesn't work. Lies upon lies don't solve sh&(t, and never will.
I've not looked into the theory I mentioned in depth, but hope to soon, among other theories as well.
I've not looked into the theory I mentioned in depth, but hope to soon, among other theories as well.
Hooke's Law
brilliant.org...
How can Hooke's law be used to determine the mass of an object?
Given a Hookean spring of spring constant
k
k, fix one end of the spring to the ceiling and the other end to the object. In equilibrium, the spring force will balance the downward force of gravity on the object, which allows computation of the mass
m
m from the displacement
x
x of the spring.
Gravity exerts a force Fg=mg downward proportional to the mass m.
m of the object, which is perfectly matched by the spring force
Fs =−kx in equilibrium, where the negative sign indicates that the spring force acts in the opposite direction. The mass is obtained by setting these forces equal:
m= kx/g . □
Work Done By Gravity
byjus.com...
Gravity is defined as the force that attracts a body towards the earth or towards any other physical body having mass.
If a particular object is falling, the particle is bound to point in the direction of gravity. The magnitude of the falling body depends on the mass, gravitational constant and height from which it is falling.
The work done by gravity is given by the formula,
Wg = -mg(∆ h)
Where,
m = mass,
g = gravity,
h= height
The negative sign shows that the particle is dropping from a height Δ h vertically in the direction of gravity.
If θ is the angle made when the body falls, the work done by gravity is given by,
W = m g h cosθ
Where the theta is the angle made when the body falls.
Solved Examples
Example 1
A 15 kg box falls at angle 25 ∘ from a height of 10 m. Determine the work done by gravity.
Solution:
Given:
Mass m = 10 kg,
angle =
The work done by gravity formula is given by,
W = mgh cos θ
W = 15 × 9.8 × 10× This is the rendered form of the equation. You can not edit this directly. Right click will give you the option to save the image, and in most browsers you can drag the image onto your desktop or another program.
=15 × 9.8 × 10×0.9063
= 1332 J
Therefore, the work done by gravity is 1332 J.
Converting Between Potential Energy and Kinetic Energy
courses.lumenlearning.com...
Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem). We will find it more useful to consider just the conversion of PEg to KE without explicitly considering the intermediate step of work. (See Example 2.) This shortcut makes it is easier to solve problems using energy (if possible) rather than explicitly using forces.
More precisely, we define the change in gravitational potential energy ΔPEg to be ΔPEg = mgh, where, for simplicity, we denote the change in height by h rather than the usual Δh. Note that h is positive when the final height is greater than the initial height, and vice versa. For example, if a 0.500-kg mass hung from a cuckoo clock is raised 1.00 m, then its change in gravitational potential energy is
m
g
h
=
(
0.500
kg
)
(
9.80
m/s
2
)
(
1.00
m
)
=
4.90
kg
⋅
m
2
/s
2
=
4.90
J
mgh = (0.500 kg)(9.80
m/s
2
)(1.00 m) = 4.90 kg⋅
m
2
/s
2
=4.90 J
Note that the units of gravitational potential energy turn out to be joules, the same as for work and other forms of energy. As the clock runs, the mass is lowered. We can think of the mass as gradually giving up its 4.90 J of gravitational potential energy, without directly considering the force of gravity that does the work.