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# problem_pdf - katseftis(ik2453 HW8 Mackie(20211 This...

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katseftis (ik2453) – HW8 – Mackie – (20211) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A(n) 79 . 4 g ball is dropped from a height of 51 . 1 cm above a spring of negligible mass. The ball compresses the spring to a maximum displacement of 4 . 96829 cm. The acceleration of gravity is 9 . 8 m / s 2 . x h Calculate the spring force constant k . Answer in units of N / m. 002 10.0 points A wheel rotating with a constant angular ac- celeration turns through 17 revolutions during a 7 s time interval. Its angular velocity at the end of this interval is 13 rad / s. What is the angular acceleration of the wheel? Note that the initial angular veloc- ity is not zero. Answer in units of rad / s 2 . 003 (part 1 of 3) 10.0 points As a result of friction, the angular speed of a wheel c hanges with time according to d θ d t = ω 0 e σ t , where ω 0 and σ are constants. The angular speed changes from an initial angular speed of 5 . 26 rad / s to 4 . 26 rad / s in 3 . 92 s . Determine the magnitude of the angular acceleration after 1 . 6 s.

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problem_pdf - katseftis(ik2453 HW8 Mackie(20211 This...

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