7.Consider sound dB level is increased from 70 dB to 83 dB, what is the intensity increased? Take the ratio of hlI1 =? 8.Consider a speaker is heard from a distance of l O meters, the sound level is 20 dB, what will the dB level be if youmoved to 50 meters away?

A 4.50 m long rope is stretched between two supports with a tension that makes the speed of transverse waves 48.0 m/s . a)What is the wavelength of the fundamental tone? b)What is the frequency of the fundamental tone? c)What is the wavelength of the second overtone? d)What is the frequency of the second overtone? e)What is the wavelength of the fourth harmonic? f)What is the frequency of the fourth harmonic?

What is the tension in the spring and the stress in the steel?

SECTION 10.2 Analysis Model: Rigid Object Under Constant Angular Acceleration 3. A wheel starts from rest and rotates with constant angular V acceleration to reach an angular speed of 12.0 rad/s in 3.00 s. Find (a) the magnitude of the angular acceleration of the wheel and (b) the angle in radians through which it rotates in this time interval. 4. A machine part rotates at an angular speed of 0.060 rad/s; QIC its speed is then increased to 2.2 rad/s at an angular accel- eration of 0.70 rad/s². (a) Find the angle through which the part rotates before reaching this final speed. (b) If both the initial and final angular speeds are doubled and the angular acceleration remains the same, by what factor is the angular displacement changed? Why?