It says: A flywheel with a 15-cm diameter is rotating at a rate of 7 radians/sec. What is the linear speed of a point on its rim, in centimeters per minute.
First off, the answer is 3150 cm/minute (according to the book). Now what I did was take the angular speed (which is the 7 radians/sec part, right???), and multiply it by the radius, which is 7.5, and then multiply it be 60 to get it from seconds to minutes. Is that the correct way to find the answer?
The second question is: A wheel with a 30-cm radius is rotating at a rate of 3 radians/sec. (Again, is the 3 radians/sec part called the angular speed?) What is the linear speed of a point on its rim, in meters per minute?
I got 54m/minute by taking the 3, multiplying it be 30, multiplying it by 60, and dividing by 100 (to get from cm to m). Is that all right? Thanks so much! I'll pick a best answer TODAY!!!!
2007-09-18 07:14:07 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Yes, you got them right! Congrats!!!
2007-09-18 07:30:09 · answer #1 · answered by Swamy 7 · 0⤊ 0⤋
Your answers check with mine.
When I wrote out the equations I included the dimensions. Note that radians is a dimensionless number so it can be thrown out. Of course it is Speed and not Velocity because Velocity has direction which in this case is constantly changing. However, radians /sec is the velocity of radians,
not the speed, angular velocity not angular speed.
2007-09-18 07:51:32 · answer #2 · answered by ? 5 · 0⤊ 0⤋
This text was printed on a four color web heat set offset press. A cylinder on this press has a 13.37 in diameter. The linear speed of a point on the cylinder s surface is 18.33 feet per second. What is the angular speed of the cylinder in revolutions per hour?
We got 18,770.4 iph
2015-01-11 14:23:40 · answer #3 · answered by Julie 1 · 0⤊ 0⤋
Sounds like you got it.
2007-09-18 07:20:50 · answer #4 · answered by ? 6 · 0⤊ 0⤋