Can you please answer these 2 questions. they where answered wrong here : 1) JUS
ID: 1395228 • Letter: C
Question
Can you please answer these 2 questions. they where answered wrong here :
1)JUST FIND PART D:
http://www.chegg.com/homework-help/questions-and-answers/object-mass-m-100kg-attached-spring-spring-constant-k-275n-m-whose-unstretched-length-l-02-q7730691
2.)
An electric ceiling fan is rotating about a fixed axis with an initial angular velocity magnitude of 0.300 rev/s . The magnitude of the angular acceleration is 0.893 rev/s2 . Both the the angular velocity and angular accleration are directed clockwise. The electric ceiling fan blades form a circle of diameter 0.740 m .
My correct info:
Part A
Compute the fan's angular velocity magnitude after time 0.201 s has passed.
Express your answer numerically in revolutions per second.
0.479
rev/s
Through how many revolutions has the blade turned in the time interval 0.201 s from Part A?
Express the number of revolutions numerically.
7.83
0.479
rev/s
Explanation / Answer
Fc = Fe
M*R*w^2 = k*(R-L)
1*R*5^2 = 275*(R-0.2)
25R = 275R - 55
R*(275-25) = 55
R = 0.22 m
Fc = Fe
m*(2L)^2*w2 = k*(2L-L)
1*0.4^2*w2 = 275*(0.4-0.2)
w2 = 343.75 rad/s <------answer
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2)
r = 0.74 = 0.37 m
atan = 0.37*0.893 = 0.33 m/s^2
arad = v^2/r = ((1.11)^2)/0.37 = 3.33 m/s^2
a = sqrt(atan^2+arad^2)
a = 3.346 m/s^2 <-------answer