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9 Nov 2019

The Figure shows four situationsin which a red liquid and a
gray liquid are in a U-tube. In one situation the liquidscannot
be in static equilibrium. (a) Which situation is that? (b) Forthe
other three situations, assume static equilibrium. For each,is
the density of the red
liquid greater than, less
than, or equal to the
density of the gray liquid?
Assume the liquids will
not mix with each other.


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Lelia Lubowitz
Lelia LubowitzLv2
8 Jan 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Two liquids, 1 and 2, are in equilbrium in a U-tube thatisopen at both ends. The liquids do not mix, and liquid 1 restsontop of liquid 2. How is the density of liquid 1 related tothedensity of liquid 2?
a) ρ1 is equal to ρ2 becausethe liquidsare in equilibrium
b) ρ1 is greater than ρ2
c)ρ1 is less than ρ2
d) there is not enough info to tell which liquid hasgreaterdensity

Textbook Problem

Two square plates of sides ℓ are placed parallel to each other with separation d as suggested in Figure P25.39. You may assume d is much less than ℓ. The plates carry uniformly distributed static charges +Q0 and −Q0. A block of metal has width ℓ, length ℓ, and thickness slightly less than d. It is inserted a distance x into the space between the plates. The charges on the plates remain uniformly distributed as the block slides in. In a static situation, a metal prevents an electric field from penetrating inside it. The metal can he thought of as a perfect dielectric, with κ → ∞. (a) Calculate the stored energy in the system as a function of x. (b) Find the direction and magnitude of the force that acts on the metallic block. (c) The area of the advancing front face of the block is essentially equal to ℓd. Considering the force on the block as acting on this face, find the stress (force per area) on it. (d) Express the energy density in the electric field between the charged plates in terms of Q0, ℓ, d, and ϵ0. (e) Explain how the answers to parts (c) and (d) compare with each other.

Figure P25.39

Chapter 25, Problem 39AP, Two square plates of sides are placed parallel to each other with separation d as suggested in

 

As shown in the figure below, a wooden cube measuring 20.0 cm oneach side floats in water with 80.0% of its volume submerged.Suspended by a string below the wooden cube is a metal cube. Themetal cube measures 10.0 cm on each side and has a specific gravityof 6.00. This means that the density of the cube is 6.00 timeslarger than that of water, which we take to be 1000 kg/m3.

(a) Which cube has a larger buoyant force acting on it?

i. the wooden cube

ii. the metal cube

iii. the buoyant forces are equal for both

(b) Taking the density of water to be 1000 kg/m3,what is the density of the wooden cube? (kg/m3)

(c) What is the tension in the string between the cubes? Assumethe string itself has negligible mass and volume. Use g =9.8 m/s2. (N)

(d) The pair of blocks is now placed in a different liquid. Whenthe blocks are at equilibrium in this new liquid, the buoyant forceacting on the wooden cube is exactly the same as the buoyant forceacting on the metal cube. What is the density of this new liquid?(kg/m3)

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