Thermodynamics

Determine the units of viscosity,m, in the following equation:
t=m(du/dy), where t is a shear stress, u a velocity, and y is a distance in (a) the Engineering English system, and (b) the SI system.

  1. 👍
  2. 👎
  3. 👁
  1. stress is force/area = kg-m/s^2m^2 = kg/ms^2

    I'll use v distinguish viscosity from mass

    kg/ms^2 = v * (m/s / m) = v/s

    v = kg/ms or kilograms per meter-second

    this can be verified at wikipedia under the viscosity article.

    looks like t = kg * (m/s / s) = kg m/s^2 = Newtons

    1. 👍
    2. 👎
  2. Steve is correct.

    In my generation, viscosity was usually quoted in Handbooks in units of g/(cm*s), called the poise, or 1% of that, called the centipoise.

    English units of viscosity were seldom used. I seem to recall some English units called Saybolt slugs. I have never heard a better argument for the metric system.

    1. 👍
    2. 👎
  3. This may help:
    http://www.hydramotion.com/pdf/Website_Viscosity_Units_V2.pdf

    1. 👍
    2. 👎
  4. A sensible unit of viscosity in the English engineering system would be slugs per foot-second.

    See
    http://www.convertworld.com/en/dynamic-viscosity/Slug+per+foot+second.html

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. science --- pls check my work!!!

    hi, pls check my work asap! 1. A ___ has a definite shape and a definite volume. (1 point) solid*** liquid gas molecule 2. Why is a gas able to flow? (1 point) Its particles have melted and can move around.Its particles have high

  2. Science

    2. why is gas able to flow? a) Its particles have melted and can move around b) Its particles have high viscosity and can move around c) Its particles have enough energy to move around d) Its particles have enough pressure to move

  3. Solid Mechanics

    A cast iron block of 5Cm^2 cross section carries an axial compressive load of 50KN.Calculate the magnitude or normal and shear stresses on a plane whose normal is inclined at 30 deg.to the axis of the block,also determine the

  4. Physics (Stress & Strain)

    A hole 3cm in diameter is to be punched out of a steel plate 8cm thick. The shear stress of the material is 670GPa. What load is required on the punch? 3cm = 0.03m 8cm = 0.08m Lateral surface area (As) = pi*D*h = 3.1416 * .03m *

  1. Health

    Which statement is NOT true? 1.Some people do not have stress ** 2. Stress is normal and can be positive or negative 3. Over a long period of time, stress can harm your health 4. Stress cannot always be avoided, but it can be

  2. Focus on the Child, Part 2

    Which of the following statements is true of children and stress? A. Children's needs should never be postponed or they'll suffer damaging stress effects. B. Children need to face some stress and problems to develop strength and

  3. Physics

    A 25.0 m tall hollow aluminum flagpole is equivalent in strength to a solid cylinder of aluminum 3.50 cm in diameter. A strong wind bends the pole much as a horizontal force of 900 N exerted at the top would. How far to the side

  4. Materials Science

    A 3-point bending test is performed on a simply supported beam of length L=4m and of rectangular cross-section, with width b and height h. For a central load of 10kN, draw the bending moment and shear force diagrams for the beam.

  1. soil mechanics

    total normal stresses of 110 and 40 kpa are applied to two planes at right angles in an element of soil. the shear stress acting on those palnes is 20 kpa. what must be the value of the pore pressure in the element if the minor

  2. statistics

    In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1-10. The data appear below. Number of Cups of Coffee Stress Level 3 5 2 3 4 3 6 9 5 4 1

  3. Physics

    Which one of the following stresses would be most likely to cause a bone to fracture? A) tensile stress B) compressive stress C) sheer stress D) bulk stress

  4. physics

    The anchor shackle supports a cable force of 600 lb. If the pin has a diameter of 0.25 in., determine the average shear stress in the pin.

You can view more similar questions or ask a new question.