3b Home-Cal State LA m FALL 2017 PHYS 1100-03 × y va phys1100-Chpt07-F16 x clwww

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3b

Home-Cal State LA m FALL 2017 PHYS 1100-03 × y va phys1100-Chpt07-F16 x clwww.webassign.net/web/Student/Assignment-Responses/submit?dep|7007180.Q3 x e M calculator-Safer Browse × 3. 1/2 points I Previous Answers SerCP8 7 P005 A dentist's drill starts from rest. After 2.90 s of constant angular acceleration it turns at a rate of 2.9 x 10 rev/min. (a) Find the drill's angular acceleration. 1047 b) Determine the angle (in radians) through which the drill rotates during this period. 6440 Your response differs from the correct answer by more than 10%. Double check your calculations. rad Need Help? Read It Talk to a Tutor Submit Answer Se ProgressPractice Another Version 4. 4/4 points | Previous Answers SerCP8 7.P.009 ssm The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.63 m and 1.03 m, respectively. The respective rotational speed Calculate the speeds of the tips of both rotors. main rotor 178.68 tail rotor 220.68 m/s m/s

Explanation / Answer

here,

time taken , t = 2.9 s

angular speed , w = 29000 rev/min

w = 3035.3 rad/s

a)

w = 0 + alpha * t

alpha = 1047 rad/s^2

the drill's angular accelration , alpha = 1047 rad/s^2

b)

the angle travelled , theta = 0 * t + 0.5 * alpha * t^2

theta = 0 + 0.5 * 1047 * 2.9^2 rad

theta = 4402.6 rad

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