An anemometer for measuring wind speed consists of four metal cups, each of mass
ID: 1904842 • Letter: A
Question
An anemometer for measuring wind speed consists of four metal cups, each of massm = 116.0 g, mounted on the ends of four essentially massless rods of lengthR= 0.38 m. The rods are at right angles to each other and the structure rigidly rotates atf = 12.0 rev/s. Treat the cups as point masses.
I=
L=
An anemometer for measuring wind speed consists of four metal cups, each of massm = 116.0 g, mounted on the ends of four essentially massless rods of lengthR= 0.38 m. The rods are at right angles to each other and the structure rigidly rotates atf = 12.0 rev/s. Treat the cups as point masses.
Explanation / Answer
(a)moment of inertia : I = 4*m*R^2 = 4*116*0.38^2 = 67 g-m^2
(b) angular velocity w =2**f=2*12=24*
angular momentum L =I*w = 67.0016*24 = 5051.8 g-m^2/s