18. Alice, Bob, and Carol are each given identical airtight bags containing identical rocks, and a large tub of water with a scale sitting on the bottom. Each of them measures the weight of their bag and rock by putting the bag on the scale, using three slightly different procedures. Alice closes the bag carefully, so that there is no air inside. • Bob fills the rest of the bag with water before closing it. • Carol closes the bag loosely, so that it contains some air. What is the correct ranking of their measured weights WA, WB, and We? (A) We

18. Alice, Bob, and Carol are each given identical airtight bags containing identical rocks, and a large tub of water with a scale sitting on the bottom. Each of them measures the weight of their bag and rock by putting the bag on the scale, using three slightly different procedures. Alice closes the bag carefully, so that there is no air inside. • Bob fills the rest of the bag with water before closing it. • Carol closes the bag loosely, so that it contains some air. What is the correct ranking of their measured weights WA, WB, and We? (A) We

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Description: 18. Alice, Bob, and Carol are each given identical airtight bags containing identical rocks, and a large tubof water with a scale sitting on the bottom. Each of them measures the weight of their bag and rock byputting the bag on the scale, using thr

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Fluid Pressure

The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.

Gauge Pressure

Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.

Topic Video

Question

18. Alice, Bob, and Carol are each given identical airtight bags containing identical rocks, and a large tub
of water with a scale sitting on the bottom. Each of them measures the weight of their bag and rock by
putting the bag on the scale, using three slightly different procedures.
Alice closes the bag carefully, so that there is no air inside.
• Bob fills the rest of the bag with water before closing it.
• Carol closes the bag loosely, so that it contains some air.
What is the correct ranking of their measured weights WA, WB, and We?
(A) WC <WA <WB
(D) WA = We <WB
19. A student sets up a simple pendulum, measures its length to be (0.50±0.01) m, and observes a period of
oscillation of (1.4±0.1)s. Using this data, the student computes g = 10.1 m/s². What is the uncertainty
of this measurement?
(A) 0.7 m/s²
(B) 1.2 m/s²
(D)
(B) WA <WC <WB
(E) WC < WA = WB
v₂ (t)
(C) 1.4 m/s²
20. A mass attached to the end of a string oscillates like a pendulum with small amplitude. The mass has
horizontal velocity v₂(t) and vertical velocity vy(t). Which of the following could be a graph of the curve
(vz(t), vy(t)) over a complete oscillation?
vy(t)
vy(t)
$ 8
(A)
vy(t)
(B)
vy(t)
Đ
(C) WA < WC = WB
(D) 1.9 m/s²
v₂ (t)
vy(t)
p.
vy(t)
(E) 2.7 m/s²
(C)
vy(t)
v₂(t)

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