HW1 Solution

HW1 Solution - lew(dl9564 hk1 Opyrchal(41104 This print-out...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
lew (dl9564) – hk1 – Opyrchal – (41104) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A girl ties a toy airplane to the end oF a string and swings it around her head. The plane’s average angular speed is 2.5 rad/s. In what time interval will the plane move through an angular displacement oF 3.3 rad? Correct answer: 1 . 32. Explanation: Let : ω avg = 2 . 5 rad / s and Δ θ = 3 . 3 rad . ω avg = Δ θ Δ t Δ t = Δ θ ω avg = 3 . 3 2 . 5 = 1 . 32 . keywords: 002 10.0 points A fgure skater begins spinning counterclock- wise at an angular speed oF 3.8 π rad/s. Dur- ing a 4.7 s interval, she slowly pulls her arms inward and fnally spins at 8.1 π rad/s. What is her average angular acceleration during this time interval? Correct answer: 2 . 87422 rad / s 2 . Explanation: Let : ω 1 = +3 . 8 π rad / s , Δ t = 4 . 7 s , and ω 2 = +8 . 1 π rad / s . α avg = ω 2 - ω 1 Δ t = 8 . 1 π rad / s - 3 . 8 π rad / s 4 . 7 s = 2 . 87422 rad / s 2 . 003 10.0 points A wheel rotating with a constant angular ac- celeration turns through 18 revolutions during a 6 s time interval. Its angular velocity at the
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 3

HW1 Solution - lew(dl9564 hk1 Opyrchal(41104 This print-out...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online