Please need help with preparatory exercise questions 3 and 4 In this lab we exam
ID: 1477006 • Letter: P
Question
Please need help with preparatory exercise questions 3 and 4
In this lab we examine a) how to measure the pressure of a container of gas in the normal atmospheric environment, and b) the use Arehimedes' Principle to determine the volume of an irregularly-shaped solid body, and to determine the density of an immersed object or of a liquid. Review absolute pressure, gauge pressure, and Arehimedes' Principle in the text book or your lecture notes. You will probably need your textbook if you want to finish the lab report during the lab period. If the levels of the fluid (of density rho) in the two arms of a manometer differ by how do you express the gauge pressure and the absolute pressure of the gas being sampled? Define the following units: Pascal; torr. Suppose a spring scale (calibrated in, say, Newtons) suspends an object in a liquid, submersed but not touching the container. Explain from Arehimedes' Principle why the spring scale will read less than when the object is suspended in air. An electronic balance, on which is placed a beaker with liquid, gives a reading m_0 in grams. Now we suspend a metal cylinder in the liquid. Explain in terms of Arehimedes' "principle" and Newton's Third Law why the balance will now read m' which is greater, i.e., m' > m_0. Explain why (m' - m_0) is NOT the mass of the cylinder. Explain why the volume of the suspended object is given by: V_object = (m' - m_0)/rho_fluid.Explanation / Answer
3
a)
The balance will read greater because of the volume of the liquid displaced by the introduction of cylinder has to be condidered., hence the mass is not just a substraction.
b) m'-mo is not mass of cylinder because because of Archimedes principle, some volume is displaced by matal cylinder, that has to be kept in mind in calculation.
c) there are two things, two objects with different densities, one is cylinder and another is liquid, considering these densities and writing Volume Submerged = Volume displaced by Archimedes principle leas us to the expression given in (c)
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.