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Homework 09

# Homework 09 - homework 09 GADHIA TEJAS Due 4:00 am Question...

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homework 09 – GADHIA, TEJAS – Due: Mar 28 2007, 4:00 am 1 Question 1 part 1 of 3 10 points A ball at the end of a string of length 1 . 7 m rotates at a constant speed in a horizontal circle. It makes 5 . 2 rev / s. What is the period of the ball’s motion? Answer in units of s. Question 2 part 2 of 3 10 points What is the frequency of the motion? Answer in units of Hz. Question 3 part 3 of 3 10 points What is the ball’s angular velocity? Answer in units of rad / s. Question 4 part 1 of 1 10 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 3.4 rad? Answer in units of s. Question 5 part 1 of 2 10 points A grinding wheel, initially at rest, is ro- tated with constant angular acceleration of 2 . 1 rad / s 2 for 9 . 04 s. The wheel is then brought to rest, with uniform deceleration, in 13 . 1 rev. Find the magnitude of the angular deceler- ation required to bring the wheel to rest. Answer in units of rad / s 2 . Question 6 part 2 of 2 10 points Determine the time needed to bring the wheel to rest. Answer in units of s. Question 7 part 1 of 1 10 points A wheel rotates with a constant angular acceleration of 2 . 05 rad / s 2 . Suppose that at t 0 = 0, the angular speed of the wheel is 2 . 83 rad / s. What angle does the wheel rotate through in 3 . 52 s? Answer in units of rev. Question 8 part 1 of 2 10 points A dog sits 1.7 m from the center of a merry- go-round. a) If the dog undergoes a 1.5 m/s 2 cen- tripetal acceleration, what is the dog’s linear speed? Answer in units of m / s.

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