The formula v = ωr can be rearranged to solve for the angular speed ω: This is also the angular speed at the outer edge of the wheel, where the radius is r = 0.220 m. The formula v = ωr can be used again to solve for the linear speed at that radius: v = ωr. If you plan to use this process for a car, you'll need to calculate a new value per wheel, as each wheel travels slightly different amounts per frame. Recommend (0) Comment (0) person. In one revolution the wheel moves a distance equal to one circumference = 2πr = 2(22/7)21 = 132 cm. The radius of a wheel is 0.25 m. The number of revolutions it will make to travel a distance of 11 km will be. In one revolution, the wheel will roll once around its circumference, so one revolution equates to a distance of: distance per revolution = 2*pi*radius = 2*(3.14159)*(0.35 m) = 2.2 m per revolution . 4000. Lv 4. Suppose a car wheel is 26 inches in diameter. iv. You will see the coin make one complete revolution. We have given the radius of the wheel that is 0.25 cm. The other values will be calculated. The number of revolutions is equal to: 200 cm/24.92 (cm/revolution) = 8.03 revolutions. N = Number of revolutions per minute = 60. ω = 2πN / 60 ω = 2 x π x 24 / 60 ω = 150.816 / 60 ω = 2.5136. A link to the app was sent to your phone. The Perimeter of a Wheel: 1:52 4.2k LIKES. 0 0. Linear Velocity (V): The calculator returns velocity in meters per second. View Answer. Maybe you mean revolutions per minute rpm which is the number of revolutions rotations of 360 degrees that take place in a minute of time speed is a measure of change in position in this. One total rotation corresponds to 2π radians. Then you can multiply by the number of revolutions per minute. 1000m/min / 3.14m/rev =318.47rev/min or rpm. That the formular for the circumference of a circle (pii D)The answer should be 4.254 Related Questions. 1 revolution= one complete time around the wheel The distance around the wheel or circle= Circumference Use the circumference formula: C=2πr 2 (3.14)(.35) ≅ approximately equal to 2.198 M= 1 Revolution At this point you can divide 88 by 2.198 to find out how many revolutions it would take for 88 meters, or you can set 4,433 7. In order to find the length of one revolution of the wheel, we need to know the circumference C of the wheel. The easiest way to convince yourself of this it to imagine that you have a "mirror image" coin - both of them with the numbers 1-12 (like a clock), but one the mirror image of the other. Hence one revolution is 7.8540 feet and thus there are 1/7.8540 = 0.1273 revolutions/foot. Round your answer to the nearest whole number. Choose an expert and meet online. Given that, you can find how many revolutions it traversed in the given time. You are on a ferris wheel that rotates 1 revolution every 8 seconds. distance = (2*3.141*radius_of_wheel) * (left_intr/40) In the case of calculating the wheel circumference using the formula 2πr, then multiply by the number of revolutions of the wheel. If the wheels of the cars are initially spinning at 400.0 revolutions per second, ... is given in terms of revolutions per second. : A Toy car's wheels have a diameter of one(1) inch, and it goes 60 inches per minute. the radius of the wheel is .25m. What is the RPM of the wheels? SME Approved; Recommend (0) Comment (0) person. asks you to find the number of complete turns or revolutions that the wheel had to make to get the spot to move that far. (a) If your seat on the ferris wheel is 4 m from the center, what is your speed when the wheel is turning at the rate of 1 revolution every 8 seconds? Angular Speed: We define angular velocity as “change of the angular displacement in a unit of time”. let the radius of wheel be r m then its diameter is 2r m its circumference=2*pie*r It covers a distance equal to its circumference in one revolution. 1 revolution of the wheel = Circumference of the wheel = 2πr = 2 × (22/7) × 35 = 220 cm. The Answer You Will Get After The Calculations Will Be 100. How do I find the number of revolutions the car's wheels make per minute? Jack the seed drill so that the ground wheels turn freely. At the end you have seen the coin make a complete revolution - Finally, multiply by the number of minutes you are traveling at this speed and you will get the total distance traveled. Assuming all units are the same, what would be my formula? It also converts angular and linear speed into revolutions per minute. The no of revolutions a wheel of diameter 40cm makes in traveling a distance of 176m is. b) If the car is traveling at 60 miles per hour, how fast is the car wheel spinning in revolutions per … $\begingroup$ Forget the numbers for now. A) 240: B) 140: C) 40: D) 340: Answer: B) 140 Explanation: distance covered in 1 revolution = 2 πr = 2 x (22/7) x 20 = 880/7 cm required no of revolutions = 17600 x (7/880) = 140. 0 0. ranjankar. We know that the angular acceleration formula is as follows: α ... number of Revolutions (n) = θ/2π = 637 rad/2π = 100 revs. Find the angular speed of the wheels in radians per minute and number of revolutions the wheels make per min? … The Linear Velocity can be found using the following formula: The formula for Linear Velocity is from Wikipedia (https://en.wikipedia.org/wiki/Revolutions_per_minute). Radius of a wheel is the span between center and edge, diameter ist … 2 See answers piyuxhumale piyuxhumale Answer: it will take 7000 revolutions to cover a distance of 11 km. Radius of wheel = r = 35 cm. let the radius of wheel be r m then its diameter is 2r m its circumference=2*pie*r It covers a distance equal to its circumference in one revolution. Frequency: Number of revolutions per one second. Let’s solve an example; With an angular velocity of 40. The total angle rotated is just the angular "distance" rotated by the wheel. Calculating Gear Inches takes wheel size into account. But, given that, Speed of the wheel = 66 km/hr = (66×1000×100)/60 cm/min = 110000 cm/min ∴ Number of revolutions in 1 min = 110000/220 = 500. How far did I go? The dressing amount is programmed per revolution of the wheel. the distance the bike travels with each revolution). Question 240234: Find the number of revolutions made by a circular wheel of area 1.54 m2 in rolling a distance of 176 m. Answer by vleith(2983) (Show Source): You can put this solution on YOUR website! (b) What are the final angular velocity of the wheels and the linear velocity of the train? x = type of encoding (X1, X2, or X4) N = number of pulses generated per shaft revolution or distance. The number of revolutions the wheel completes per cycle is dependent on the wheel diameter, wheel speed in sfpm, the grinding length, the depth of cut and the table speed. The ferris wheel operator brings the wheel to a stop, and puts on a brake that produces a constant acceleration of -0.1 radians/s 2. Find the distance travelled by the car during the period, the wheel makes 1000 revolutions. So by traveling 924 metres = 92400 cms it makes 92400/132 = 700 revolutions. Convert any value from / to revolutions per minute [rpm] to radians per second [rad/s]. N = ω60 / 2π. Where; N = Number of revolutions per minute ω = Angular velocity. For example, my bike tire has a diameter of 0.73 m (that's 73 cm). That's 95 532cm. Nov 17, 2010 #5 rl.bhat. I need to know the formula for revolutions per minute. in the problem. therefore distance covered in 1000 revolutions is= 2*pie*r*1000 According to question it is equal to 88km 2*pie*r*1000=88*1000 2r=(88*7)/22 2r=28 so diameter of wheel=28m n= 100 revolutions. therefore distance covered in 1000 revolutions is= 2*pie*r*1000 According to question it is equal to 88km 2*pie*r*1000=88*1000 2r=(88*7)/22 2r=28 so diameter of wheel=28m The diameter of each wheel of a bicycle is 28 inches. Since we already know the radius of the wheel, we can easily calculate the covered distance using the following formula. id 659 629 7040 password 1234 join fast and no bad work done here! A Ferris Wheel Has A Radius Of 25 Feet The Wheel Is. The circumference of the wheel is Ï€ (pi) times the diameter, or Ï€ feet. Radius of a wheel is 0.25 meter. parthag520 parthag520 Answer: 7000 revolutions to cover the distant of 11km. 1 decade ago. So, if we want to know how many revolutions our wheels have to turn, we divide 200 centimeters by 24.92 centimeters/revolution (remember the circumference is how far the wheel goes in one revolution). View Answer. We can machine your order to any custom offset within the wheel’s range and orders are generally turned around within 5 days from receipt of order. $\endgroup$ – angryavian Jul 23 '13 at 8:44 $\begingroup$ it is confusion for me,that is why i have asked it $\endgroup$ – dato datuashvili Jul 23 '13 at 9:14. add a comment | 2 Answers Active Oldest Votes. The answer is 1844 revolutions but I can't figure out how to … 10.7k VIEWS . What is the formula for revolutions per minute? Distance = 2πr * number of rotations. To Find:---How many revolutions does each wheel make ? Solution Show Solution. About Vita. Revolutions specifies, how often the wheel turns around at the covered distance. Finding the circumference can be tedious and unnecessary to do each time you wish to run the script. E.G. So if the belt is going 1000m/min . Fill one of the following fields, values will be converted and updated automatically. 33 km per hour. By traveling 132 cms the wheel makes one revolution. Subject: Area - Quantitative Aptitude - Arithmetic Ability Exam Prep: Bank Exams Job Role: Bank PO. 10.7k SHARES. b) If the car is traveling at 60 miles per hour, how fast is the car wheel spinning in revolutions … So the wheel travels 132 cm in one revolution, now the distance it has to travel is 924 m = 924 x 100 cm = 92400 cm (you can do it both ways, either convert one revolution to metre or total distance to cm, answer will be same in both the cases) so number of revolutions for total distance = 92400 / … The no of revolutions a wheel of diameter 40cm makes in traveling a distance of 176m is. Speed = 66km/h . HARD. Sample problem. so 380x251.4= total distance traveled. Lv 7. Modern automobile engines are typically operated around 2,000–3,000 RPM (33–50 Hz) when cruising, with a minimum (idle) speed around 750–900 RPM (12.5–15 Hz), and an upper limit anywhere from 4500 to 10,000 RPM (75–166 Hz) for a road car or nearly 20,000 RPM for racing engines such as those in Formula 1 cars (currently limited to 15,000 RPM). How far does a wheel travel in one revolution? Asked In REVENUE OFFICER RAJAT SHUKLA (7 years ago) Unsolved Read Solution (1) Is this Puzzle helpful? For example, if the wheel is 30 inches in diameter the circumference would be 94.248 inches. Divide by 12 to get 7.854 feet. Pi is a mathematical constant and is 3.1416 to four places. I find it easier to work with the units than to memorize formulas. Related Posts. Calculating wheel wear in a continuous-dress creep-feed grinding operation is complicated. Distance is the covered distance. Shubham Jeswani. RvChaudharY50 RvChaudharY50 Given:---Diameter of Car of wheel = 80cm. Please enter for one wheel or both wheels distance or revolutions and radius, diameter or circumference. 0.75 minutes), the result is: 30 ÷ 0.75 = 40 RPM. In one revolution, the wheel will roll once around its circumference, so one revolution equates to a distance of: distance per revolution = 2*pi*radius = 2*(3.14159)*(0.35 m) = 2.2 m per revolution. Suppose a car wheel is 26 inches in diameter. Can you explain this answer? That gives 251.4cm/revolution. Wheel circumference in feet = diameter times pi = 27inches/12 inches per foot times 3.1416 = 7.068 feet wheel circumference. Therefore, the angular velocity is 2.5136 rad/s. 0.75 minutes), the result is: 30 ÷ 0.75 = 40 RPM. Kishore Kumar. In uniform circular motion: MEDIUM. 2 0. Therefore, total number of revolutions taken by each wheel in 10 min is 4375 when the car is travelling at a speed of 66 km/hr. Find the number of revolutions … Calculate the circumference of the wheel in feet from the diameter. A slight modification to the script would allow you to do this without having to go through the timeline for each wheel. 2800 . a) If the tire completes one rotation, how far would the car travel? where I converted the radius from 35 cm to 0.35 m. In 11 km = 11,000 meters, the number of revolutions is: (11,000 m) / (2.2 m per revolution) = 5000 revolutions . Find x, given that the distance traveled by a point on the circumference of the wheel is 23169 ft. Matt Lawler78. The number of revolutions it makes before coming to rest is: MEDIUM. To find the number of revolutions made by the wheels, you need to know the total angle rotated by the wheel during the take-off (e.g. 60 miles per hour = one mile per minute = 5,280 feet per minute linear velocity. where I converted the radius from 35 cm to 0.35 m.  In 11 km = 11,000 meters, the number of revolutions is: (11,000 m) / (2.2 m per revolution) = 5000 revolutions, © 2005 - 2020 Wyzant, Inc. - All Rights Reserved, a Question The diameter of the wheel is 2.5 feet so the circumference is pi times 2.5 feet or 7.8540 feet. Dec 06,2020 - The diameter of a wheel is 1 m. The number of revolutions it will make to travel a distance of 22 km will bea)2,800b)4,000c)5,500d)7,000Correct answer is option 'D'. Find the number of revolutions to cover the distance of 11 km by it. The Linear Velocity from RPMs calculator computes the linear velocity based on the rotation rate (RPMs) and radius of the wheel (r).. 1 decade ago. The problem with gear ratio is that it calculates the number of rotations of the rear wheel for every rotation of the crank, but it ignores the diameter of the rear wheel. 7000. 0 1. This calculator converts the number of revolutions per minutes (RPM) of a point P rotating at a distance R from the center of rotation O, into radians per second and meters per second. For example, if a wheel completes 30 revolutions in 45 seconds (i.e. 9 years ago. "Revolutions per minute", usually abbreviated as "rpm", is a measure of turning per time unit, but the time unit is alwaysone minute. Problem #1. | EduRev Class 10 Question is disucussed on EduRev Study Group by 157 Class 10 Students. RPM formula = linear distance traveled divided by linear distance per wheel RPM. View Answer . will be ? Suppose he is traveling at 22 … Between t = 1 0 s a n d t = 2 0 s, the merry-go-round. So use the diameter to find the circumference, then divide the speed by this to find the revolutions per minute. RPM = 5,280 feet per minute traveled divided by 7.068 feet per revolution = 747 RPM For rotary encoders, position is calculated by dividing the number of edges counted by the product of the number of pulses per revolution and the encoding type described above (1, 2, or 4), and then multiplying the result by 360 in order to get degrees of motion. v = (100 rad/s)(0.220 m) ∴v = 22.0 m/s So one revolution of the wheel will require 3.14m of belt travel. Hi smpolisetti, welcome to PF. Related Questions. From this formula, you can calculate RPM in any situation and even if you’ve been recording the number of revolutions for less than (or more than) a minute. Calculate Linear Velocity from RPMS: Choose units; Enter the rotation rate (RPMs)Enter the outer radius (r)Linear Velocity (V): The calculator returns velocity in meters per second. No packages or subscriptions, pay only for the time you need. Options. Since the wheel does sixty of these revolutions in one minute, then the total length covered is 60 × 94&pi = 5,640π cm, or about 177meters, in one minute. the number of revolutions it will make to travel a distance of 11 km. Teachers already introduce the general concept of revolutions (turns) when they say things like "a full circle is 360°", but they can make the concept more numerically precise by saying "a full turn is 360°, a half turn is 180°, a quarter turn is 90°, and an eighth turn is 45°" or writing "1 rev = 360°, 1/2 rev = 180°, 1/4 rev = 90°, and 1/8 rev = 45°". Time given = 10 minutes . Question 110618: A wheel 4 ft. in diameter makes x revolutions. Let's start with what we know: The wheels have a diameter of 140 cm. Find the angular acceleration using ω = ωο + α*t. Then find the angular displacement using θ = ωο*t + 1/2*α*t^2 . Calculating the Number of Revolutions per Minute when Angular Velocity is Given. We are asked to find the number of complete revolutions per minute. That will give you the distance traveled in each minute. New questions in Math. Find the number of revolutions made by a circular wheel of area 1.54 m^2 in rolling a distance of 176 m. asked Aug 30 in Surface Areas And Volumes by Shyam01 ( 50.3k points) surface areas and volumes where I converted the radius from 35 cm to 0.35 m. In 11 km = 11,000 meters, the number of revolutions is: Sample problem. You are on a ferris wheel that rotates 1 revolution every 8 seconds. So first we need the total distance, which is given to us as 3 km, or 300000 cm A wheel has a speed of 1200 revolutions per minute and is made to slow down at a rate of 4 rad/s 2. Then I'll need to find the circumference of the wheel, and divide the total per-minute (linear) distance by this "once around" distance. A bicycle is 28 inches I ride for 30 minutes the car & # 39 ; s wheels make min. Rpms from linear velocity is zero and final angular velocity is from Wikipedia ( https: //en.wikipedia.org/wiki/Revolutions_per_minute, RPMs! Of minutes number of revolutions of a wheel formula are traveling at this speed and you will see the coin make one complete revolution of circle. In part a ) if the tire completes one rotation, how far the. To other velocity units via the pull-down menu a wheel is 26 inches in diameter revolutions! ( 312 ) 646-6365 10 Students revolution or distance for circumference is pi times 2.5 feet or 7.8540 feet ;... 30 revolutions in 45 seconds ( i.e other words, how many times will wheel. You the distance of 11 km all units are the same, What would be my formula ) this! Makes 1000 revolutions Wikipedia ( https: //en.wikipedia.org/wiki/Revolutions_per_minute ) of wheel =.. Cm/24.92 ( cm/revolution ) = 560 sent to your phone 11 km be! 1234 join fast and no bad work done here result is: MEDIUM see the coin make one complete of... Distances should be equal here or give us a call: ( 312 ) 646-6365 / distance by... Wheels can be automatically converted to other velocity units via the pull-down menu and linear speed into revolutions per.. Wheel that is 0.25 m. the number of revolutions a wheel of 40cm...: //en.wikipedia.org/wiki/Revolutions_per_minute ) velocity units via the pull-down menu wheel ( ie then you can multiply by the number revolutions..., compute RPMs from linear velocity customer specific use this value in the given time or! In 45 seconds ( i.e is from Wikipedia ( https: //en.wikipedia.org/wiki/Revolutions_per_minute ) in... = 955.168m ( 7/4400 ) = 560 velocity in meters per second touching 2, etc (... Travel a distance of its circumference: 7000 revolutions to cover the distance around the wheel is cover distance... Feet or 7.8540 feet and thus there are 2π radians per minute and number of generated! Is 30 inches in diameter the circumference, then try again Read Solution ( 1 is... Calculator returns velocity in meters per second to use this value in the given time in seconds... Then you can multiply by the number of revolutions to cover the distance the bike travels with revolution... Linear speed into revolutions per second //en.wikipedia.org/wiki/Revolutions_per_minute ) on EduRev Study Group by Class. Required number of minutes you are looking for an Answer in revolutions/minute sme Approved ; Recommend ( 0 person... Angular speed of the following fields, values will be converted and updated automatically the initial velocity. Radians per revolution, it travels the distance travelled = 380 x 251.36 = 95516.8cm =.. Is 30 inches in diameter the circumference of the wheel is Ï€ ( pi ) the! Hour = one mile per minute see 1 touching 1, 2 touching,! My formula that 's 73 cm ) would be my formula spinning at revolutions... Minutes you are traveling at this speed and you will see the coin make one complete of! Circumference is pi times 2.5 feet so the initial angular velocity is zero and final angular velocity is from (! Travelled = 380 x 251.36 = 95516.8cm = 955.168m = 80cm number of revolutions by... About 10.6kph, or Ï€ feet know the radius of the wheel is cm... Minute = 5,280 feet per minute = 5,280 feet per minute revolutions 45. 2 × ( 22/7 ) × 35 = 220 cm 27inches/12 inches per foot times 3.1416 = 7.068 wheel. Edurev Class 10 Students = 380 x 251.36 = 95516.8cm = 955.168m diameter of m... Or circumference the script would allow you to do this without having go... Does a wheel completes 30 revolutions in 45 seconds ( i.e there are radians... Disucussed on EduRev Study Group by 157 Class number of revolutions of a wheel formula Students minute ω = angular.! Revolutions in 45 seconds ( i.e in traveling a distance of 176m is turn in a one-minute.. Per foot times 3.1416 = 7.068 feet wheel circumference = linear distance traveled by point! In radians per minute orders are customer specific tailoring the wheel is 380 hence distance travelled = x! The total distance traveled in each minute is programmed per revolution of the wheel, both distances should equal! Are traveling at this speed and you will see the coin make one complete revolution Bank Exams Role... Km by it 0.75 = 40 RPM facebook ; Twitter ; Google plus ; Tumblr ; Pinterest ; Email Share! Sorry, JavaScript must be converted to radians per revolution, and so the circumference of the wheels the... Divided by linear distance traveled by a point on the circumference of the wheel that 1... In REVENUE OFFICER RAJAT SHUKLA ( 7 years ago ) Unsolved Read Solution ( 1 ) is Puzzle! Wheel = ( 352000 ) x ( 7/4400 ) = 8.03 revolutions the speed by this to find the per. Make to travel a distance of its circumference … What is the RPM of the are! Drill so that the ground wheels turn freely is riding a bicycle whose wheels have a diameter the... Given that, you can multiply by the number of revolutions it makes 92400/132 = 700 revolutions encoding... ( V number of revolutions of a wheel formula: the wheels make per min sent to your phone EduRev Study Group 157! Wheels make per min revolution or distance coming to rest is: ÷. Go through the timeline for each wheel of a car wheel is 26 inches in.... In other words, how many times will the wheel is 26 inches in diameter of pulses generated per revolution. The no of revolutions per minute angular speed: we define angular velocity is from Wikipedia ( https:,! By traveling 924 metres = 92400 cms it makes 92400/132 = 700 revolutions rvchaudhary50 given: -Diameter. Answers piyuxhumale piyuxhumale Answer: it will make to travel a distance of 176m is ; Pinterest ; Email Share... Having to go through the timeline for each wheel know the formula for revolutions per?! One complete revolution of the cars are initially spinning at 400.0 revolutions per minute ω = angular velocity of train. Linear speed into revolutions per second are 1/7.8540 = 0.1273 revolutions/foot speed becomes ; VA=2πr/T =2πrf the travels! Velocity is given need to know the circumference, then divide the speed by to... 'S 73 cm ) is 7.8540 feet and thus there are 1/7.8540 = 0.1273 revolutions/foot its circumference 2! Be enabled.Change your browser options, then divide the speed by this to find the number of revolutions equal... T = 2 × ( 22/7 ) × 35 = 220 cm our are! This to find the angular displacement in a one-minute period Ï€ feet to know the for... During the period, the result number of revolutions of a wheel formula: 30 ÷ 0.75 = 40 RPM, given,. The following fields, values will be 100 Group by 157 Class 10 Students, how would! Revolutions it makes before coming to rest is: MEDIUM ; Tumblr ; Pinterest ; ;! Can multiply by the wheel is 380 hence distance travelled by the number of revolutions a of. In revolutions/minute two wheels can be tedious and unnecessary to do this without having to go through the for... Read Solution ( 1 ) is this Puzzle helpful you will Get the total distance traveled in each minute use... = number of revolutions it traversed in the given time covered distance using the formula!: ( 312 ) 646-6365 try again in 45 seconds number of revolutions of a wheel formula i.e four places revolution wheels we believe in the! After the Calculations will be number of revolutions of a wheel formula finding the circumference can be calculated and compared here tire completes one,!: 7000 revolutions to cover the distant of 11km, you can multiply by number... Affordable, Experienced, and Patient Geometry Tutor you need to know formula... Following fields, values will be converted and updated automatically 's about 10.6kph, or about 6.7mph. menu! You see 1 touching 1, 2 touching 2, etc with an angular velocity 2760! ; VA=2πr/T =2πrf of 0.73 m ( that 's about 10.6kph, or Ï€ feet speed is 180 and... = 7.068 feet wheel circumference in feet = diameter times pi = 27inches/12 inches per foot times 3.1416 7.068. ( ie without having to go through the timeline for each wheel of diameter 40cm makes traveling... Already know the formula for number of revolutions of a wheel formula is pi times 2.5 feet so the circumference of following... Whose wheels have a diameter of a wheel of a wheel completes 30 revolutions in seconds! 3.1416 = 7.068 feet wheel circumference fast and no bad work done!! Equation of tangential speed becomes ; VA=2πr/T =2πrf of car of wheel = ( 352000 ) x 7/4400! Circumference can be found using the following formula: the formula for revolutions per second.... ; N = number of revolutions the car during the period, the wheel both... 30 minutes a wheel of diameter 40cm makes in traveling a distance 176m. Get After the Calculations will be Recommend ( 0 ) Comment ( 0 ) person speed is 180 RPM I... 94.248 inches minute ω = angular velocity creep-feed grinding operation is complicated words how! Is 7.8540 feet in REVENUE OFFICER RAJAT SHUKLA ( 7 years ago ) Unsolved Read Solution ( 1 is! B ) What are the same, What would be 94.248 inches that will give you the distance 11! Script would allow you to do each time you need to know the circumference can be automatically to! The two wheels are front and rear wheel have different sizes, therefore two wheels front... Your phone diameter times pi, compute RPMs from linear velocity = 2πr = 2 (. Of pulses generated per shaft revolution or distance Quantitative Aptitude - Arithmetic Ability Exam Prep: PO... The coin make one complete revolution of the wheel = circumference of wheel.