An 15-cm-long bicycle crank arm, with a pedal at one end, is attached to a 21-cm-diameter sprocket, the toothed disk around which the chain moves. A Part A cyclist riding this bike increases her pedaling rate from 61 rpm to 95 rpm in 12 s. Assume constant angular acceleration. What is the tangential acceleration of the pedal? Express your answer to two significant figures and include the appropriate units. • View Available Hint(s) Tempjetes Symbols undo redo Teset keyboard shortcuts help at = Value Units Submit Part B What length of chain passes over the top of the sprocket during this interval? Express your answer to two significant figures and include the appropriate units. • View Available Hint(s) Tempjates Symbols undo regdo Teset keyboard shortcuts help 1= Value Units Submit

An 15-cm-long bicycle crank arm, with a pedal at one end, is attached to a 21-cm-diameter sprocket, the toothed disk around which the chain moves. A Part A cyclist riding this bike increases her pedaling rate from 61 rpm to 95 rpm in 12 s. Assume constant angular acceleration. What is the tangential acceleration of the pedal? Express your answer to two significant figures and include the appropriate units. • View Available Hint(s) Tempjetes Symbols undo redo Teset keyboard shortcuts help at = Value Units Submit Part B What length of chain passes over the top of the sprocket during this interval? Express your answer to two significant figures and include the appropriate units. • View Available Hint(s) Tempjates Symbols undo regdo Teset keyboard shortcuts help 1= Value Units Submit

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Let's begin with the angular acceleration of a compact disk (CD). To play music the CD must rotate at high speed while a laser reads data encoded in a spiral pattern on the disk. The disc has radius R = 6.0 cm = 0.060 m; when data are being read, it spins at 7200 rev/min. What is the CD's angular velocity w in radians per second? How much time is required for it to rotate through 90° ? If it starts from rest and reaches full speed in 4.0 s, what is its average angular acceleration? Figure 02 Δθ = 900 w= 7200 rev/min R = 0.060 m 1 of 1 0₁ SOLVE To convert the disc's angular velocity w to radians per second, we multiply by (1 min/60 s) and by (2π rad/1 rev): (1 min) (2π rad 1 rev From the definition of angular acceleration (Cav rest), the average angular acceleration is Part A - Practice Problem: W= From the definition of angular velocity (w = A0/At), we find the time At for the disc to turn through 90° (π/2 rad): π/2 rad 754 rad/s Aw/At), if the disc reaches a final angular velocity of…
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A strap, rod, or something comparable is used to spin up the disc. T imagine someone hand-starting a lawnmower. If he pulls the strap with a final speed before pulling the strap away, what is the rotation rate of the disk, w in rev/s? The moment of inertia of a disc is 1/2MR?. There's no sliding. • Strap's final speed = v = 0.74 m/s. • The disc's radius is R = 0.7 m • The small disc's radius is 1 cm • The disc's mass is M = 0.7 kg
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Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. An overhead door is guided by wheels at A and B that roll in horizontal and vertical tracks. When = 40°, the velocity of wheel B is 2.1 ft/s upward. 5 ft A B 5 ft TOMTOTO Determine the angular velocity of the door. (You must provide an answer before moving on to the next part.) The angular velocity of the door is rad/s.
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Because 2? rad = 1 rev, the angular displacement in part (b) corresponds to 2.23 rev. In general, dividing the number of radians by 6 gives a good approximation to the number of revolutions, because 2? ~ 6.QUESTION If the angular acceleration were doubled for the same duration, by what factor would the angular displacement change? PRACTICE IT Use the worked example above to help you solve this problem. A compact disc rotates from rest up to an angular speed of 34.0 rad/s in a time of 0.889 s. (a) What is the angular acceleration of the disc, assuming the angular acceleration is uniform? rad/s2(b) Through what angle does the disc turn while coming up to speed? rad(c) If the radius of the disc is 4.45 cm, find the tangential speed of a microbe riding on the rim of the disc. m/s(d) What is the magnitude of the tangential acceleration of the microbe at the given time? m/s2 EXERCISEHINTS: GETTING STARTED | I'M STUCK! Use the values from PRACTICE IT to help you work this exercise.…