Calculate the resistance of the mercury

Assignment Help Physics

Reference no: EM13242139

In one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.22 mm is filled with mercury at 20°C. The resistance of the mercury is measured with the aid of electrodes sealed into the ends of the tube. If 100.00 cm of the tube is wound in a spiral around a patient's upper arm, the blood flow during a heartbeat causes the arm to expand, stretching the tube to a length of 100.06 cm. From this observation, and assuming cylindrical symmetry, you can find the change in volume of the arm, which gives an indication of blood flow. Take ?Hg = 9.4 10-7 ? · m.

(a) Calculate the resistance of the mercury.

(b) Calculate the fractional change in resistance during the heartbeat. Hint: Because the cylindrical volume is constant,
V = AiLi = AfLf and Af = Ai(Li/Lf).

% increase

Reference no: EM13242139

Questions Cloud

Determine the profit maximizing level of output : a. Determine the profit maximizing level of output. b. Compute the profit maximizing price. c. Calculate the upper and lower limits within which marginal cost may vary without affecting the profit maximizing output

Find price and quantity that would maximize social welfare : A. Find the price and quantity that maximizes the company's profit B. Find the price and quantity that would maximize social welfare C. Find out Dead weight loss

What will be rate of return eventually earned by all firms : There are 300 purely competetive farms in the local dairy market. Of the 300 dairy farms, 298 have a cost structure that generates profits of $24 for every $300 invested.

What is the magnitude of the vector product : Vector A ? has magnitude 10.0m m and vector B ? has magnitude 18.0m m . The scalar product A ? ?B ? is 90.0m 2. What is the magnitude of the vector product

Calculate the resistance of the mercury : In one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.22 mm is filled with mercury at 20°C, Calculate the resistance of the mercury

What is a time series : Explain the terms: simple random sampling , systematic sampling, stratified sampling, cluster sampling and what is a time series? Explain the 4 main components of a time series.

Find the amplitude of the e and b fields : the solar constant is the radiant flux density from the sun at the earth's surface and is about 0.135 W/cm^2 when the sun is directly overhead, find the amplitude of the E and B fields

Two important policy goals of the government and the fed are : Two important policy goals of the government and the Fed are to keep unemployment and inflation low, while at the same time making sure that GDP is increasing at an average of 3% per year. It is important to have the right mix of policies and that al..

Find the magnetic flux through a flat surface : A magnetic field of magnitude 0.38 T is directed vertically upward, Find the magnetic flux through a flat surface of area 22 cm2 if the surface is horizontal

User Account

All Pages