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Unformatted text preview: PHYSICS 111 EXAM 1 FALL 2010 Please 'fill in your computer answer sheet as follows: 1) In the NAME grid, fill in your last name, leave one blank space, then your first name. 2) Write your nine digit 10 number in the IDENTIFICATION NUMBER section of the sheet starting with A. 3) Write your recitation section number in the spaces K, L in the SPECIAL CODES section. Single digits should be preceded by a 0 (e.g. section 1 is written as 01). 4) Fill in the circles on the sheet corresponding to the letters or numbers of your name, 10 and section with a #2 pencil. In all problems except 5 neglect the effects of air friction. 1. A race driver starting from rest accelerates his car to a speed of 20 m/s in 7.2 s. What is the average (t == lI;-(hr acceleration of the car? j:.. (a) 1.3 m/s2 @) 2.8 m/s~(c) 3.4 m/s2 (d) 4.2 m/s2 Zt. = ?o -0 (e) 5.6 m/s2 ~ .. \.fJ-_= 'Z./!"'"/s9 2. The force of gravitational attraction between two masses is given by the law F = G m1 m2 I r2 where r is a distance and G is the universal gravitational constant. What are ....--~~d~im~ensions of G? (a)L 3 /MT (b)L 2 /(M 2 T) (c)M/(L T2) (d)L/MT 2 eGis a constant and is therefore dimensionless. F :;:: G- WL \ vfl-z.. / /L--7.. G :::: _ = ~ L "2.) -r;Y\ F fl.--'- ,_. W\.."'L. T1- l ~ 1.E:) v- =- Et- />fe ~ X == Vr-iO-O'1..-+-~O"""':;- = ,-z.. ~ ~ t-l::' ~ =. LOliw- ,S 3. A student drives due north on 1-35 from Ames to Clear t.""L.::: 0,5 tvw.. Lake (80 miles) at a speed of 75 mph, stops 30 minutes t.."3=~=2j~ to get a hamburger and then drives due east from Clear~t= 3,7Q '-'+ Lake to her home (100 miles) at a speed of 45 mph~ -::J:\ What is the magnitude of her average velocity? ~= ~~~ = "34-~ Hint: Use mph and hours. mph = miles per hour ) 34 m~(b) 39 mph (c) 47 mph (d) 55 mph (e) 60 mph 4. A 200...
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