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# Physics 101 PH2213

MSU

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These notes cover Estimation and conversion of units in a very detailed way
COURSE
Physics I for Scientists and Engineers
PROF.
Dr. Chun Su
TYPE
Class Notes
PAGES
3
WORDS
KARMA
Free

## Popular in Physics

This 3 page Class Notes was uploaded by Deborah Oluwadamilola Eseyin on Friday August 26, 2016. The Class Notes belongs to PH2213 at Mississippi State University taught by Dr. Chun Su in Fall 2016. Since its upload, it has received 8 views. For similar materials see Physics I for Scientists and Engineers in Physics at Mississippi State University.

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Date Created: 08/26/16
Notes for Physics 1 Week 1 MSU. Converting to other units and Estimating: Examples: 1. The fourteen tallest peaks in the world are referred to as “eight­thousanders”, meaning their  summits are over 8000m above sea level. What is the elevation, in feet, of an elevation of 8000m? Solution: First of all, we need to read over the question and find out what the question is asking us. It says what is the elevation in feet, and we were given the elevation in meters. So that means we are changing  from meters to feet. We know that 100cm = 1m, 1inch = 2.54cm, 12inches = 1 foot. Since we know that we can definitely  convert from meters to feet. 8000m 100cm 1inch 1foot 1m 2.54cm 12inches      As you can see all the units cancel off leaving only foot so that means you can calculate the elevation  in feet. I use this table to help me anytime I am trying to convert units because it always (if done right)  gives me the right answer. So we multiply 8000 by 100 and divide the product by the product of 2.54 and  12. So therefore, the answer in feet is 26246.7ft. 2. You have seen a nice apartment whose floor area is 880 square feet. What is its square meters? Solution: Since it’s in square feet that automatically means that if you decide to use the table then you have to  double the SI units you have on the table so it can cancel off the units well 880 feet feet 12inches 12inches 2.54cm 2.54cm 1m 1m 1 foot 1 foot 1inch 1inch 100cm 100cm As you can see we are left with two m’s and you are multiplying them so m x m is m . So like before  we find the prod2ct of 880, 12,12,2.54, and 2.54 and divide by the product of 100 and 100. And your  answer is 81.75m 3. Where the posted speed limit is 55 miles per hour, what is the speed in (a) meters per second(m/s) and (b) in kilometers per hour(km/hr) Solution: (a) Just like before we will draw our table but this time it’ll be a little different. 55miles 5280 feet 12inches 2.54cm 1m 1 hour 1 minutes hour 1miles 1 feet 1inch 100cm 60 minutes 60 seconds As you can see we are left with m on top and seconds below and since we are dividing that it’s  going to be m/s. So just like before multiply the numbers above and divide that by the product of  the numbers below and that equals 24.5 m/s. (b) Next we find the value for km/hr 55miles 5280 feet 12 inches 2.54cm 1m 1km hour 1miles 1 foot 1 inch 100cm 1000m Just like always we are left with the right SI units (km/hr) , so all we have to do is find the  product of all the numbers on top and divide by the product of the numbers underneath, and that  equals 88.5 km/hr. ESTIMATION: Examples: 1. Estimate how much water there is in a particular lake, which is roughly circular, about 1km  across, and you guess it has an average depth of 10m. Solution: We were giving the height and diameter of a lake so we assume that the lake is in a shape of a  cylinder. And the volume of a cylinder is V =  hr , so that gives us a better estimate. So we  plug in our values in our equation, but since we are given the diameter we have to divide that by 2 in order to get the radius (r = d/2) 1km = 1000m   r= 1000m/2 = 500m So therefore, V = (3.142) x (10) x (500) x (500) = 7.8 x 10 m 2. Estimate the height of the building if a person with height of 1.5m is standing 2m away from  a bus top which is 3m high. Solution:             1.5m            X = ? 16cm         2cm This is a diagram of what the problem signifies. Since we have the base and height of the smaller triangle  (1.5 x 2) we can use the ratio operation to find x since we have the base for the larger triangle.  So therefore, 1.5 x 2m 18m Then you cross multiply 2x = 18(1.5) 2x = 27 Then divide through by 2 X = 27/2 X= 13.5m This is the end of Chapter 1 more chapters will be loaded soon!!!!!!!!!!!!!!!..........................

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