Question 573330: Please help! My teacher taught me a fomrula to use, S=0*r (S=feta multiplied by the radius)...but it's just not making any sense! the quwstion is:
The tip of a pendulum, after swinging through an arc of 2 1/2 radians, forms an arc whose length is 10 inches. Find the length of the pendulum.
Found 2 solutions by Alan3354, lwsshak3:
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! The tip of a pendulum, after swinging through an arc of 2 1/2 radians, forms an arc whose length is 10 inches. Find the length of the pendulum.
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Arc length = radius*angle in radians
10 = r*2.5
r = 4 inches
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Using radians makes it easy.
Answer by lwsshak3(11628)  (Show Source):
You can put this solution on YOUR website! Please help! My teacher taught me a fomrula to use, S=0*r (S=feta multiplied by the radius)...but it's just not making any sense! the quwstion is:
The tip of a pendulum, after swinging through an arc of 2 1/2 radians, forms an arc whose length is 10 inches. Find the length of the pendulum.
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I believe what your teacher had in mind is the formula: S=r*theta, S=length of the arc, 10 inches in your problem, theta=the angle in radians the arc makes, 2 1/2 radians, in your problem, and r=radius,length of the pendulum in your problem.
..
r=S/theta=10/2.5=4
ans:
length of the pendulum=4 inches
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