Physics 1029A/B Lecture 6: PhysicsLec6

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greenduck439

29 Dec 2015

School

Western University

Department

Physics

Course

Physics 1029A/B

Professor

Martin Zinke- Allmang

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Document Summary

Additional features of a fluid flowing through a constriction: pressure change (venturi meter) 1: work needed to change the kinetic energy of the yellow fluid element o o o o o. Ethanol (p = 0. 79 g/cm ) flows smoothly through a horizontal pipe that tapers in cross sectional area. The pressure difference p between the wide (index 1) and the narrow sections (index 2) of the pipe is 5. 0 kpa. With p2 p1 = p = 5. 0 kpa. 123 l/min of an unknown liquid flow smoothly through a horizontal pipe that tapers in cross sectional area from a1 = 10 cm to a2 = a1/2. The pressure difference p between the wide and the narrow sections of the pipe is 5. 0 kpa. Solution: we start with bernoulli"s equation and the equation of continuity. Note that p > 0 in this form.

Related Questions

A horizontal Venturi Flow Meter consists of a converging-diverging conduit. The diameters of cross-sections 1 and 2 are 6 and 4 inches. The velocity and static pressure are uniformly distributed at cross-sections. Determine the volume flowrate (ft^3/s) through the meter if p1-p2= 3psi and the flowing fluid is oil (density = 56 lbm/ft^3) and the loss per unit mass from 1 to 2 is negligibly small.

azurecattle926

Air is flowing steadily through a horizontal, constant diameter pipe. The pipe wall is heated uniformly so that the temperature of the air increases as the air flows through the pipe. You may assume that the air temperature is constant across the cross-section at any length down the pipe. If the air pressure remains constant (pressure drop is small enough to ignore), what can you say about the average velocity of air in the pipe?

Group of answer choices:

(a)velocity will increase because increased temperature indicates the air molecules are moving faster and have higher kinetic energy

(b)velocity will increase in the flow direction because density decreases as air temperature increases

(c)velocity will decrease because hot pipe walls will increase friction inflowing air

(d)velocity remains constant because the pipe is rigid so air can’t expand or change density

(e)velocity remains constant since flow is steady

silverpug509

A charge q that moves between two points A and B, and has anelectric force acting on it ( and perhaps several other forces) haswork W done on it by the electric force. The electrostatic force isconservative and so we can define a change in electric potentialenergy, Delta U = -W. We defined electric field using the relationF^^\-> = q E^^\->, and in a similar way we define electricpotential commonly called voltage as
Delta V = V_B - V_A = -W/q=(Delta U)/q or equivalently q Delta V =q (V_B - V_A) = -W=Delta U

A ball has mass 3.0 Âµg and charge -6 nC moves from point A to pointB. It has the same speed at points A and B, and the work done bythe electric field during the move is -1.5 mJ.
(a) What is the change in electric potential energy of the ball?1
(b) What is the change in voltage between points A and B? 2
(c) At which point does the ball have a higher electric potentialenergy?
(d) Which point has the higher voltage?
(e) Has the kinetic energy of the ball changed?

Physics 1029A/B Lecture 6: PhysicsLec6

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Physics: Principles with Applications

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