Physics Exam Instructions You may work together on this exam to solve problems.
ID: 3163176 • Letter: P
Question
Physics Exam Instructions You may work together on this exam to solve problems. You may talk to us about the problems. You may post on blackboard and ask about problems. You should not work with people outside of class to solve any problems. solution should include motion diagrams and graphical representations as necessary. solutions should be written clearly and concisely. It might be wise to include instructions at points in your solution. Very importantly you must write your own explanation describing the physics of the solution to the problem. It is really appropriate to reference you solution in your essay they are not independent. The essay is to be your work alone. You should justify any assumptions and describe the impact k these assumptions (if they are wrong or used purely for achieving a simple solution) You need not explain the math, only the physics. You must include results in your essay. We do not want to have to. refer back to your work to get the answer THE ESSAY MUST STANDALONE! when talking about a situation, the associated pictures and diagrams must be there sothat the reader need not jump around in the document. You are trying to PLEASE the reader (also known as the grader). There will be the need to do some research to get masses of objects, reasonable si coefficients of friction, etc, as needed to solve a problem. cannot All solutions will have the 30 second rule applied. The 30 second rule means that if the grader proper figure out what you are doing in 30 seconds, you get a zero. drawing proper diagrams with labeling, Not additional 1 point per occurrence inappropriate use of or signs, and lack of units will get an deducted.Explanation / Answer
To measure the gravitational field constant we consider that the spring is of zero-length quartz for the test mass. That means the spring will not follow the Hook's law and force will be proportional to the measured length. Therefore we can use the famous pendulum formula for time period and L to measure the gravitational constant. Now we create a pendulum using the rubberband ball and the string. Using Cdo we measure the time period for different length or L
now using T=2*piesqrt(L/g)
or g= 4pie^2L/T^2 we get the gravitational constant
if T= 5sec for length/strech= 3cm=.03m then g=4*(22/7)^2(.03/5^2)=.047m/s^2
the earth g= 9.8m/s^2 that means the gravitational force in Robin's possition is .0048 times the earth
low gravitational force in robins position. Therefore T measurement must be accurate to get result.