Please Answer Thuroughly-POINTS ONLY FOR STEP BY STEP-please 37. While spinning
ID: 1267881 • Letter: P
Question
Please Answer Thuroughly-POINTS ONLY FOR STEP BY STEP-please
37. While spinning down from 500.0 rpm to rest, a solid uniform flywheel does 4.4k J of work. If the radius of the disk is 1.2m, what is its mass?
A.)5.2 kg
B.)3.8 kg
C.)5.9 kg
D.)4.5 kg
40.)The figure 15-2 shows the displacement of a wave at a given position as a function of time and the displacement of the same wave at a given time as a function of position. Determine the speed of the wave.
A.)1.5m/s
B.)0.75m/s
C.)2.00cm/s
D.)0.66cm/s
E.)3.0m/s
Explanation / Answer
1. energy = Iw^2 /2
4.4 x 10^3 = (m x 1.2^2 /2) x (500 x 2pi/60)^2 /2
m = 4.5 kg
2. speed = wavelength / timeperiod = 3 / 4 = 0.75 m/s