A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initiall angular position andd a final angular position of the rigid body. Which of the sets can occur only if the rigid body rotates through more than 180 degree?
a) 3 rad, 6 rad
b) -1 rad 1 rad
c) 1 rad 5 rad
** I think it is B, but I am not sure. Could someone please help me out and also show me how they got the answer.
THANK YOU
2007-10-20 02:43:01 · 6 answers · asked by markeesha h 1 in Science & Mathematics ➔ Physics
I would say it is c). Here is why.
1 pi (3.14159...) rad is 180deg
a) 3 rad to 6 rad is counterclockwise, totaling 3 rads. Not enough.
b) -1 to 1 is counterclockwise, and covers 2 rads. Again not enough.
c) 1to 5 rad is counterclockwise, and covers 4 rads. That is a winner!
2007-10-20 03:19:03 · answer #1 · answered by Edward 7 · 0⤊ 0⤋
The difference between final and initial should be more than 180 degree that is (pi = 3.1415 radian)
In (a) the difference is 6-3=3 rad which is less than 3.1415
hence (a ) is not correct
In (b) the difference is 1- (-1)= 2 rad which is less than 3.1415 hence (b) is not correct
In (c) the difference is 5- 1=4 rad which is more than 3.1415
hence (c) is correct
c) 1 rad 5 rad is correct , it is more than 180 degree
2007-10-20 03:44:09 · answer #2 · answered by ukmudgal 6 · 0⤊ 0⤋
a) Rotation = 6 - 3 = 3 rad = 3 x 180/pi = appx. 172 deg
b) Rotation = 1 - (-1) = 2 rad = 2 x 180/pi = appx. 115 deg
c) Rotation = 5 - 1 = 4 rad = 4 x 180/pi = appx. 229 deg
Ans: c)
2007-10-20 03:42:48 · answer #3 · answered by Sheen 4 · 0⤊ 0⤋
what s this rad yaar......Give me RRRREEEEEEEEEEEDDDD
No I cant help ..this goes straight for a six over my head
2007-10-20 02:48:00 · answer #4 · answered by scorp29 2 · 0⤊ 0⤋
check these site out, As I dont want to give you the wrong answer.
2007-10-20 02:47:30 · answer #5 · answered by poetbjc64 5 · 0⤊ 0⤋
its B
2007-10-20 02:45:52 · answer #6 · answered by <3 ~*Misty *~ <3 2 · 0⤊ 0⤋