An electric turntable 0.740m in diameter is rotating about a fixed axis with an initial angular velocity of 0.290rad/s . The angular acceleration is 0.900rad/s^2 .
a) Compute the angular velocity after a time of 0.194s. - .465rev/s
b) Through how many revolutions has the blade turned in this time interval? - .073rev
c) What is the tangential speed of a point on the tip of the blade at time t = 0.194s ?
d) What is the magnitude of the resultant acceleration of a point on the tip of the blade at time = 0.194 ?
v = r[tex]\omega[/tex]
arad = [tex]\omega[/tex]^2r
atan = r[tex]\alpha[/tex]
The Attempt at a Solution
for part c)
v = (.740/2)(.465) = .172m/s wrong
for part d)
arad = (.465)^2(.740/2) = .0800m/s^2
atan = (.740/2)(.900) = .333m/s^2
a = (.0800^2 + .333^2)^(1/2) = .342m/s^2 wrong
I'm not sure what I'm doing wrong, any help is appreciated.