How heavy is the bucket?

[Pacfanweb]

You have, say, a 5 gallon bucket. (edit: bucket weighs a pound)

You put 3 gallons of water in it. The weight of a gallon of water is known, obviously.

Then you put a live, 5lb largemouth bass in the bucket. It's alive, so it's floating around in there. (not really swimming in a bucket, I suppose)

So how much more does the bucket weigh with the bass in it?

Really doesn't matter how much the water or the bucket weighs, how much MORE does it weigh with the fish in it?

 

[hans030390]

how much does the bucket weight?

 

[Pacfanweb]

Say it weighs a pound. I'll edit to reflect that.

 

[hans030390]

well....

1+24+fish

if the fish isn't swimming, would it be 27 1/2 lbs or 30 lbs?

 

[Pacfanweb]

The fish is floating in the water. I just said it isn't swimming because I wouldn't think that is really could in a bucket.

 

[dug777]

:Q

 

[Pastore]

I hate this sh!t!!!! I never get it right!

 

[Pacfanweb]

Originally posted by: Beast1284
I hate this sh!t!!!! I never get it right!

I remember a lot of years ago the local talk radio station my grandfather listened to asked this same question.....I never heard a definitive answer.

 

[BlueWeasel]

The weight displayed by a scale wouldn't change assuming the fish is floating in the water. It's just displacing the water, and because it's floating, it's bouyant and not exerting a downward force. No downward force, no extra weight.

 

[Pacfanweb]

Originally posted by: BlueWeasel
The weight displayed by a scale wouldn't change assuming the fish is floating in the water. It's just displacing the water, and because it's floating, it's bouyant and not exerting a downward force. No downward force, no extra weight.

That's what I always thought, but then again, a 90,000 ton aircraft carrier weighs 90,000 tons, and displaces 90,000 tons of water.

But I'm sure nobody ever checked to see if the earth weighed less when they were launched into the water.

 

[Gibsons]

Originally posted by: BlueWeasel
The weight displayed by a scale wouldn't change assuming the fish is floating in the water. It's just displacing the water, and because it's floating, it's bouyant and not exerting a downward force. No downward force, no extra weight.

No, the fish has mass and that mass is affected by gravity, whether it's in the water or not. The scale will measure the weight of the fish whether it's alone, in a bucket, or in a bucket with water.

Does putting the fish in the bucket cause the water to overflow?

 

[FrustratedUser]

5lbs more.

 

[LongCoolMother]

the weight of the bucket will increase by however much the weight of the fish is.

 

[BlueWeasel]

Originally posted by: Pacfanweb

Originally posted by: BlueWeasel
The weight displayed by a scale wouldn't change assuming the fish is floating in the water. It's just displacing the water, and because it's floating, it's bouyant and not exerting a downward force. No downward force, no extra weight.

That's what I always thought, but then again, a 90,000 ton aircraft carrier weighs 90,000 tons, and displaces 90,000 tons of water.

But I'm sure nobody ever checked to see if the earth weighed less when they were launched into the water.

Yes, but it's easy to confuse mass with weight. The mass is always constant, but since the fish is bouyant, it shouldn't register any extra weight.

This riddle has been explained to me before, and they gave me a good example regarding mass versus weight. Weight is simply mass times gravitational force. Assuming I'm on the moon -- my mass never changes, but my weight is 1/6th of what it is on earth simply because the gravity constant changes.

Granted, I don't see how a 90k ton carrier weighs 0 when it's floating.

 

[TheChort]

Before:
a bucket
3 gallons of water
weight = x pounds

After:
bucket
3 gallons of water
5 lb fish (fish is not moving, equivalent to 5 lb floating rod)(and it doesn't overflow the water)
weight = x+5 pounds

answer: The scale would read an increase of 5 pounds after the fish was placed in there

 

[BlueWeasel]

Originally posted by: Gibsons
No, the fish has mass and that mass is affected by gravity, whether it's in the water or not. The scale will measure the weight of the fish whether it's alone, in a bucket, or in a bucket with water.

Nope.

Buoyancy

In physics, buoyancy is an upward force on an object immersed in a fluid (i.e. a liquid or a gas), enabling it to float or at least to appear to become lighter. If the buoyancy exceeds the weight, then the object floats; if the weight exceeds the buoyancy, the object sinks.

If the fish is floating, the upward-acting buoyancy force exceeds, and therefore offsets, the downward-acting force (weight) and the scale will not be 5lbs heavier.

 

[Gibsons]

Originally posted by: BlueWeasel

Originally posted by: Pacfanweb

Originally posted by: BlueWeasel
The weight displayed by a scale wouldn't change assuming the fish is floating in the water. It's just displacing the water, and because it's floating, it's bouyant and not exerting a downward force. No downward force, no extra weight.

That's what I always thought, but then again, a 90,000 ton aircraft carrier weighs 90,000 tons, and displaces 90,000 tons of water.

But I'm sure nobody ever checked to see if the earth weighed less when they were launched into the water.

Yes, but it's easy to confuse mass with weight. The mass is always constant, but since the fish is bouyant, it shouldn't register any extra weight.

This riddle has been explained to me before, and they gave me a good example regarding mass versus weight. Weight is simply mass times gravitational force. Assuming I'm on the moon -- my mass never changes, but my weight is 1/6th of what it is on earth simply because the gravity constant changes.

Granted, I don't see how a 90k ton carrier weighs 0 when it's floating.

Say you start with the bucket on the scale and the fish in it. The scale registers the weight of the fish plus the bucket. Now, you start adding water to the bucket. At what point does the bouyancy of the water cancel the weight of the fish? Does the scale suddenly register 5 less pounds while you're adding water? No, the scale continues to feel the weight of the fish, whether it's floating on water or not is irrelevant.

 

[Savij]

WTF are you bastards talking about? That fish has 2.26796185 kg of mass regardless of what it's sitting/on. The effect of gravity is the same regardless of what it's sh!tting in/on. Just because the fish displaces water doesn't mean that it has no weight.

If I pour 5lbs of water into a bucket, does it no longer have any weight because the water is "floating" in the water?

...Idiots

 

[hans030390]

so if thats right, my second answer must be right!

this is confusing...

 

[FrustratedUser]

Crack is one helluva drug.

 

[Savij]

Originally posted by: BlueWeasel

Originally posted by: Gibsons
No, the fish has mass and that mass is affected by gravity, whether it's in the water or not. The scale will measure the weight of the fish whether it's alone, in a bucket, or in a bucket with water.

Nope.

Buoyancy

In physics, buoyancy is an upward force on an object immersed in a fluid (i.e. a liquid or a gas), enabling it to float or at least to appear to become lighter. If the buoyancy exceeds the weight, then the object floats; if the weight exceeds the buoyancy, the object sinks.

If the fish is floating, the upward-acting buoyancy force exceeds, and therefore offsets, the downward-acting force (weight) and the scale will not be 5lbs heavier.

...idiot, the 5 lbs of upwards pressure on the fish is equalized by 5 extra lbs of downards pressure that the water exerts on the bucket.

 

[TheChort]

Originally posted by: BlueWeasel

Originally posted by: Gibsons
No, the fish has mass and that mass is affected by gravity, whether it's in the water or not. The scale will measure the weight of the fish whether it's alone, in a bucket, or in a bucket with water.

Nope.

Buoyancy

In physics, buoyancy is an upward force on an object immersed in a fluid (i.e. a liquid or a gas), enabling it to float or at least to appear to become lighter. If the buoyancy exceeds the weight, then the object floats; if the weight exceeds the buoyancy, the object sinks.

If the fish is floating, the upward-acting buoyancy force exceeds, and therefore offsets, the downward-acting force (weight) and the scale will not be 5lbs heavier.

are you serious?

 

[LongCoolMother]

Originally posted by: Gibsons

Originally posted by: BlueWeasel

Originally posted by: Pacfanweb

Originally posted by: BlueWeasel
The weight displayed by a scale wouldn't change assuming the fish is floating in the water. It's just displacing the water, and because it's floating, it's bouyant and not exerting a downward force. No downward force, no extra weight.

That's what I always thought, but then again, a 90,000 ton aircraft carrier weighs 90,000 tons, and displaces 90,000 tons of water.

But I'm sure nobody ever checked to see if the earth weighed less when they were launched into the water.

Yes, but it's easy to confuse mass with weight. The mass is always constant, but since the fish is bouyant, it shouldn't register any extra weight.

This riddle has been explained to me before, and they gave me a good example regarding mass versus weight. Weight is simply mass times gravitational force. Assuming I'm on the moon -- my mass never changes, but my weight is 1/6th of what it is on earth simply because the gravity constant changes.

Granted, I don't see how a 90k ton carrier weighs 0 when it's floating.

Say you start with the bucket on the scale and the fish in it. The scale registers the weight of the fish plus the bucket. Now, you start adding water to the bucket. At what point does the bouyancy of the water cancel the weight of the fish? Does the scale suddenly register 5 less pounds while you're adding water? No, the scale continues to feel the weight of the fish, whether it's floating on water or not is irrelevant.

exactly. remember newton's third law. yes, the buoyancy force allows the fish to float, however, there MUST be an opposite and equal force. otherwise known as "reaction force". the force of buoyancy is counteracted but the weight of the fish into the bucket bottom and into the scale.

 

[jmcoreymv]

Originally posted by: Savij
WTF are you bastards talking about? That fish has 2.26796185 kg of mass regardless of what it's sitting/on. The effect of gravity is the same regardless of what it's sh!tting in/on. Just because the fish displaces water doesn't mean that it has no weight.

If I pour 5lbs of water into a bucket, does it no longer have any weight because the water is "floating" in the water?

...Idiots

QFT

 

[LongCoolMother]

if you guys want to see for yourselves, try it, its really easy. place a cup of water on a scale and put your finger in. or, if you want, put a floating object in. observe the weight/force increase.