Suspend Water

Suspend Water




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Hungover illusions - Water suspended no cup and balancing forks trick


Kelsyus Floating Hammock


Kelsyus Floating Hammock



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Koppers Sardine Scaled Salt Water Lure, 3-Inch, Suspend, Ghost/Natural


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From GreenAir’s best-selling line of diffusers comes a fresh NEW model jam packed with amazing features. The NEW Spa Vapor uses patented ultrasonic technology to create ultrafine mists that suspend all grades of essential oils for superior lengths of time and flawless diffusion. For soothing ambiance, it features 6 rotating LED colored lights, which can be turned on/off, advanced time settings, ...

Big Berkey Water Filter System with 2 Black Purifier Filters (2 Gallons) Bundled with 2 of Fluoride (PF2) Filters and 1 Boroux Double Walled 30 oz Stainless Steel Tumbler Cup


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Add more value, versatility and convenience to your automatic underground watering system with a Rain Bird SST Series Automatic Sprinkler Timer. Customize watering schedules tailored to your unique landscape needs, while dramatically conserving water and improving lawn and plant health. The Simple-To-Set Sprinkler Timer offers maximum versatility and efficient watering with water-conscious feature...

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Kelsyus Floating Water Hammock


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Lay back and relax on the Kelsyus Floating Hammock! This water float has durable fabric-covered inflation and a soft mesh bed for a luxurious floating experience, suspending your body just below the water's surface, helping to keep you cool on those hot summer days. The oversized inflatable pillow supports your head and neck so you can keep your head mostly dry while the cares of every day life dr...

Aqua Fitness Exercise Set - 6 Piece Set - Water Workout and Aerobics - Floatation Belt, Resistance Gloves, Barbells by Aqua Leisure


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Aqua Fitness is proven to be a low-impact with high results workout: ideal for strength training, cardio endurance, and burning calories. The Aqua Fitness Training System features 6 essential pieces: comfortable floatation belt, 2 resistance dumbbells, 2 webbed gloves, and instruction guide. All aquatic equipment is chlorine resistant. Presented by Aqua Leisure—experts in water leisure and sport...

Banzai Grand Slam n' Splash Water Baseball Game Practice Set


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Geyser-blasting home plate suspends the plastic baseball in the air. With two plastic baseballs included and one inflatable baseball bat....






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Suspend Water

Find density of a statue, by suspending it from a spring, in air and in water to give 28.4N and 17N, density?

Full Question:

You are determining the density of a statue. When you suspend it from a spring scale, the scale measures 28.4N. When you completely immerse it in water, the scale reads 17.0N. What is the statue’s density?

Not sure how to tackle this one....
thanks heaps, thats great!

Well, let's see what we know. I guess you're supposed to consider the buoyant force in air also. So we don't know what the scale would measure in vacuum. It will be slightly more than 28.4 N.

The statue has a mass m, density d, volume V. The (unknown) weight in vacuum is mg.

In air, the buoyant force is the weight of the displaced air = (V*d_air)*g where d_air = density of air.

So mg - V*d_air*g = 28.4 N.

And in water, mg - V*d_water*g = 17 N.

Two equations for two unknowns m and V so this can be solved (d_air and d_water are constants that can be looked up). Subtract the 2nd equation from the 1st:
-V*d_air*g + V*d_water*g = 28.4 - 17 = 11.4

V(d_water - d_air)g = 11.4

V = 11.4/[ (d_water - d_air)*g ]

So that will give you V and you can plug it into either equation to get m. The density of the statue is m/V of course.

(edited)

Actually, I guess you don't need to worry about the density of air. If you assume that 28.4 N is the object's weight and air has a density of 0 (it's actually about 1/1000 that of water), the equations are:

mg = 28.4 N
mg - V*d_water*g = 17 N

So V = 11.4/( d_water*g)

And since m = 28.4 N/g

just plug in the values and calculate m/V.

It's late so I made this problem more complicated than it needs to be.

Suspend Water