Purchase Solution

What is the density of material: Standard kilogram of a platinum-iridium cylinder

Not what you're looking for?

Ask Custom Question

The standard kilogram is a platinum-iridium cylinder 39.0mm in height and 39.0mm in diameter. What is the density of the material?

Purchase this Solution
Solution Summary

The solution explains and solves the problem.

Solution Preview

Solution. The kilogram is defined by a platinum-iridium cylinder, cast in England in 1889. So, if the standard kilogram is a platinum-iridium ...

Solution provided by:
Changping Wang, MA
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
Purchase this Solution
Free BrainMass Quizzes
Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

The Moon

Test your knowledge of moon phases and movement.

Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

View More Free Quizzes
Related BrainMass Solutions

  • Angular Acceleration and Angular Velocity

    Find the sphere's total kinetic energy when it reaches the bottom. 3. The standard kilogram is a platinum-iridium cylinder 39.0 mm in height and 39.0 mm in diameter. What is the density of the material? Please see the attached file.

  • Physics

    199240 Density - A standard 1 kilogram weight is a cylinder 51.5 mm in height and 44.5 mm in diameter. What is the density of the material? A standard 1 kilogram weight is a cylinder 51.5 mm in height and 44.5 mm in diameter.

  • Density of Metals

    95789 Density of Metals 1. Which is more dense, lead or brass? How it can determine? 2. A sheet of metal has the dimensions 5mm, 25 cm, 55cm and its mass is 14.7kg. Using the densities of metals, can you definitely tell what metal this is?

  • Mass of Iridium in grams

    415905 Mass of Iridium in Grams What is the mass in grams for a 1000ml volume of iridium if it has a density of 22.42g/ml? I think the answer is 22,420 grams.

  • Volume and Density of a Cylinder

    119816 Volume and Density of a Cylinder 1. A solid uranium cylinder weighs 91.53 N in air and 86.63 N when submerged in water. a. The volume of the cylinder is ----------mt^3 b. The density of uranium is---------kg/mt^3 2.

  • Source activity

    534680 Source activity An Ir-192 HDR unit has an activity of 8.6 Ci on May 2. The treatment time for a vaginal cylinder is 300 seconds. If the treatment time for a similar treatment is not to exceed 10 minutes, the source must be changed on: A.

  • Application of Archimedes law

    2) The density of pure silver is 10.5g/cm^3 at 20 degrees C. If 5.25 grams of pure silver pellets is added to a graduated cylinder containing 11.2 mL of water, to what volume will the water in the cylinder rise? Please see the attached file.

  • Dielectrics and Infinite Electric Cylinders

    See the attachment for an illustration. 2) We have an infinite electric cylinder of radius R that has a polarization Pbar=kr^2 rhat (a vector) a) What is the bound volume density in the body of the cylinder b) What is the bound surface density

  • Standard Price, Standard Quantity, and Variances

    a. What is the materials price variance? Show computations. b. What is the materials quantity variance? Show computations. Fruit Snacks Corp. Inc.

View More Related Solutions