Jess
October 4th, 2013, 01:58 AM
#10 The blades of a ceiling fan have a radius of 0.402 m and are rotating about a fixed axis with an angular velocity of +1.39 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 1.94 rad/s2. After 0.540 s have elapsed since the switch was reset, what are the following?
(a) the total acceleration (in m/s2) of a point on the tip of a blade
(b) the angle phi between the total acceleration and the centripetal acceleration ac
completely stumped...I tried the use the equation that I also used in #9, which gave me the correct answers [sqrt(r^2w^4+r^2([w-w0]/t)^2] but it doesn't work for this one. I found the final to be 3.59 (not sure if that's right), and plugged that in for w (angular velocity), subtracting 1.39 (initial)...wrong answer.
(a) the total acceleration (in m/s2) of a point on the tip of a blade
(b) the angle phi between the total acceleration and the centripetal acceleration ac
completely stumped...I tried the use the equation that I also used in #9, which gave me the correct answers [sqrt(r^2w^4+r^2([w-w0]/t)^2] but it doesn't work for this one. I found the final to be 3.59 (not sure if that's right), and plugged that in for w (angular velocity), subtracting 1.39 (initial)...wrong answer.