extra question chapter 5.pdf

extra question chapter 5.pdf - extra question chapter 5 Due...

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11/10/2016 extra question chapter 5 1/15 extra question chapter 5 Due: ­­ To understand how points are awarded, read the Grading Policy for this assignment. Exercise 9.3 The angular velocity of a flywheel obeys the equation , where is in seconds and and are constants having numerical values 2.85 (for ) and 1.30 (for ). Part A What are the units of if is in ? ANSWER: Part B What are the units of if is in ? ANSWER: Part C What is the angular acceleration of the wheel at = 0.00? ANSWER: Part D What is the angular acceleration of the wheel at = 4.50 ? ANSWER: Part E ( t ) = A + B ω z t 2 t A B A B A ω rad/s ra /s d 2 rad/s rad/s 2 ra / d 2 s 2 B ω rad/s rad/s ra / d 2 s 2 rad/s 3 rad/s 2 t = α z rad/s 2 t s = α z rad/s 2
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11/10/2016 extra question chapter 5 2/15 Through what angle does the flywheel turn during the first 2.00 ? ( Hint: See Section 2.6 in the textbook.) ANSWER: Exercise 9.7 The angle through which a disk drive turns is given by , where , and are constants, is in seconds, and is in radians. When and the angular velocity is 2.40 , and when 1.60 , the angular acceleration is 1.20 . Part A Find including their units. ANSWER: Part B Find including their units. ANSWER: Part C Find including their units. ANSWER: Part D What is the angular acceleration when ? s = θ 2 θ 1 rad θ θ ( t ) = a + bt ct 3 a b c t θ t = 0, θ = π /4 rad rad/s s rad/s 2 a π /4 rad/s 2 π /2 rad/s π /4 rad π /4 rad/s b 2.40 2.40 5.3 5.3 rad/s 2 rad/s rad/s rad/s 2 c ­0.125 ­0.125 3.3 4.5 rad/s 3 rad/s 2 rad/s 3 rad/s 3 θ = π /4 rad
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11/10/2016 extra question chapter 5 3/15 ANSWER: Part E What is when the angular acceleration is 3.80 ? ANSWER: Part F What is the angular velocity when the angular acceleration is 3.80 ? ANSWER: Exercise 9.10 An electric fan is turned off, and its angular velocity decreases uniformly from 530 to 170 in a time interval of length 4.00 . Part A Find the angular acceleration in . ANSWER: Part B Find the number of revolutions made by the motor in the time interval of length 4.00 . ANSWER: Part C How many more seconds are required for the fan to come to rest if the angular acceleration remains constant at the value calculated in part A? ANSWER: = α rad/s 2 θ rad/s 2 = θ rad rad/s 2 = ω rad/s rev/min rev/min s rev/s 2 = α rev/s 2 s = N rev = t s
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11/10/2016 extra question chapter 5 4/15 Exercise 9.17 A safety device brings the blade of a power mower from an initial angular speed of to rest in 3.00 revolution. Part A At the same constant acceleration, how many revolutions would it take the blade to come to rest from an initial angular speed that was three times as great, ?
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