chemistry
posted by phys .
can you tell me what i did wrong on this problem
Rigid rods of negligible mass lying along the y axis connect three particles. The system rotates about the x axis with an angular speed of 3.30 rad/s.
4kg,y=3.00m
2kg,y=2.00m
3kg,y=4.00m
a)Find the total rotational kinetic energy evaluated from 1/2 I omega^2
4(3^2)+2(2^2)+3(4^2)=92
.5(92)(3.3)^2
b)Find the tangential speed of each 4kg and 3kg particles
4kg: 4x3.3=13.2m/s
3kg: 3x3.3=9.9m/s
c)Find the total kinetic energy evaluated from Σ mi vi2/2
.5(4kg)(6^2)+.5(2kg)(4^2)+.5(3kg)(8^2)=184
i don't know why i got these wrong
Respond to this Question
Similar Questions

Science Maths
Sir, My question is as below: Three particles a b & c of mass m are connected to each other by three massless rigid rods to from a rigid, equilateral triangular body of side 'l'.This body is is placed on a horizontal frictionless … 
college physics
In the figure below, two particles, each with mass m = 0.82 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d = 10 cm and mass M = 2.0 kg. The combination rotates around the rotation … 
physics(check my answer)
can you tell me what i did wrong on this problem Rigid rods of negligible mass lying along the y axis connect three particles. The system rotates about the x axis with an angular speed of 3.30 rad/s. 4kg,y=3.00m 2kg,y=2.00m 3kg,y=4.00m … 
Physics
The rigid object shown in Fig. 1063 consists of three balls and three connecting rods, with M = 1.5 kg, L = 0.67 m, and θ = 32°. The balls may be treated as particles, and the connecting rods have negligible mass. Determine … 
Physics
The rigid object shown in Fig. 1063 consists of three balls and three connecting rods, with M = 1.5 kg, L = 0.67 m, and θ = 32°. Fig. 1063 The balls may be treated as particles, and the connecting rods have negligible mass. … 
physics
Three particles, each of mass 3.0 kg, are fastened to each other and to a rotation axis by three massless strings, each 0.360 m long, as shown in the Figure. The combination rotates around the rotation axis with an angular velocity … 
CUC
1.Two masses of 4gm and 6gm respectively are attached to the ends of a light rod of negligible mass and the rod rotates anticlockwise at the rate of 2rev/sec about an axis passing through the center of mass and perpendicular to its … 
physics
Three objects lie in the x, y plane. Each rotates about the z axis with an angular speed of 4.44 rad/s. The mass m of each object and its perpendicular distance r from the z axis are as follows: (1) m1 = 6.00 kg and r1 = 1.00 m, (2) … 
physics
Physics Genius! please let me! Three objects lie in the x, y plane. Each rotates about the z axis with an angular speed of 6.12 rad/s. The mass m of each object and its perpendicular distance r from the z axis are as follows: (1) m1 … 
Physics
1. The problem statement, all variables and given/known data A 2.0m measuring stick of mass 0.175 kg is resting on a table. A mass of 0.500 kg is attached to the stick at a distance of 74.0 cm from the center. Both the stick and the …