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# Practice questions and answers Week 1 PHYS2070

Toledo

GPA 3.0

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This 6 page Class Notes was uploaded by Jennifer Notetaker on Saturday August 29, 2015. The Class Notes belongs to PHYS2070 at University of Toledo taught by Dr. Scott Lee in Summer 2015. Since its upload, it has received 20 views. For similar materials see General Physics I in Natural Sciences and Mathematics at University of Toledo.

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Date Created: 08/29/15

Physics Practice Qusetions and Solutions for Week 1 Text College Physics by Serway and CV 1 Find the Order of Magnitude of your age in seconds Lets say that your age 10yrs 10yrs 10quot1 multipy all values 10quot9 secs Approx1000 daysyr 10quot3 Approx 10hrday 10quot1 Aprrox 100005ecshr 10quot4 2 A Estimate the number of times your heart beats in a month b Estimate the no of times human hearts in a lifetime Solution using approximations a 1month 30days 310quotl lday 20hrs 210quot1 lhr 36005ecs36 10quot3 41OA3 Multiply values 2410quot5 In a month it beats 2410quot5 beatsmonth b 1 lifetime 100yrs 1yr 10mnths 1 month is 241OA5 Multiply values 2410 9 beatslifetime 3 A if an equation is dimensionally correct does that mean that the equation must be true No Ex m2 m2 therefore LwLh this is incorrect both have the correct dimensions but different meanings all together B If an equation is not dimensionally correct does it mean that the equation cannot be true Yes If you don39t have the correct unit you cannot have the correct equann 4 How many signi cant gures are there in the following a 789 3 sig gs b 378810quot9 4sig gs c 2 610quot6 3sig gs d 0032 25ig gs 5 The edges of a shoebox are measured to be 114cm 178cm and 29cm Determine the volume of the box containing the proper number of signi cant gures 114cm 178cm 29cm VolumeLwh 114cm178cm29cm 588468cm3 5910quot3cm3 6 A car travelling at a speed of 380ms on an interstate highway where the speed limit is 750mihr Is the driver exceeding the speed limit Justify your answer S380ms Sp limit 75mihr Convert 380mhr to mihr 1mie 0001km 1km 0621miles 3600s1hr 380ms 0001km0621mi3600s 849528mihr Car speed 85mihr speed gt imit car is speeding LThe diameter of a sphere is measured to be 536in nd a the radius of the spere in cm b the surface area of the sphere in square cm and c the volume of the sphere in cubic cm Diameter536in convert to cm 136144cm a Radius d2 136144cm2 68072cm 681cm b Surface area4 n r 2 4 11 6812 58300mg c Volume 43 11 r3 13229cm3 2132 103 cmg Physics Practice Qusetions and Solutions for Week 1 Text College Physics by Serway and CV 1 Find the Order of Magnitude of your age in seconds Lets say that your age 10yrs 10yrs 10quot1 multipy all values 10quot9 secs Approx1000 daysyr 10quot3 Approx 10hrday 10quot1 Aprrox 100005ecshr 10quot4 2 A Estimate the number of times your heart beats in a month b Estimate the no of times human hearts in a lifetime Solution using approximations a 1month 30days 310quotl lday 20hrs 210quot1 lhr 36005ecs36 10quot3 41OA3 Multiply values 2410quot5 In a month it beats 2410quot5 beatsmonth b 1 lifetime 100yrs 1yr 10mnths 1 month is 241OA5 Multiply values 2410 9 beatslifetime 3 A if an equation is dimensionally correct does that mean that the equation must be true No Ex m2 m2 therefore LwLh this is incorrect both have the correct dimensions but different meanings all together B If an equation is not dimensionally correct does it mean that the equation cannot be true Yes If you don39t have the correct unit you cannot have the correct equann 4 How many signi cant gures are there in the following a 789 3 sig gs b 378810quot9 4sig gs c 2 610quot6 3sig gs d 0032 25ig gs 5 The edges of a shoebox are measured to be 114cm 178cm and 29cm Determine the volume of the box containing the proper number of signi cant gures 114cm 178cm 29cm VolumeLwh 114cm178cm29cm 588468cm3 5910quot3cm3 6 A car travelling at a speed of 380ms on an interstate highway where the speed limit is 750mihr Is the driver exceeding the speed limit Justify your answer S380ms Sp limit 75mihr Convert 380mhr to mihr 1mie 0001km 1km 0621miles 3600s1hr 380ms 0001km0621mi3600s 849528mihr Car speed 85mihr speed gt imit car is speeding LThe diameter of a sphere is measured to be 536in nd a the radius of the spere in cm b the surface area of the sphere in square cm and c the volume of the sphere in cubic cm Diameter536in convert to cm 136144cm a Radius d2 136144cm2 68072cm 681cm b Surface area4 n r 2 4 11 6812 58300mg c Volume 43 11 r3 13229cm3 2132 103 cmg

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