Answer:
true
Explanation:
True, there are several types of polymers, thermoplastics, thermosets and elastomers.
Thermosets are characterized by having a reticulated structure, so they have low elasticity and cannot be stretched when heated.
Because of the above, thermosetting polymers burn when heated.
 
        
             
        
        
        
Answer:
Explanation:
A sonic boom is a loud sound kind of like an explosion. It's caused by shock waves created by any object that travels through the air faster than the speed of sound. Sonic booms create huge amounts of sound energy. When an object moves through the air, it makes pressure waves in front of and behind it.
 
        
             
        
        
        
Answer:
a) 246.56 Hz
b) 203.313 Hz 
c) Add more springs 
Explanation:
Spring constant = 12000 N/m 
mass = 5g = 5 * 10^-3 kg 
damping ratio = 0.4
<u>a) Calculate Natural frequency </u>
Wn = √k/m = 
                    = 1549.19 rad/s  ≈ 246.56 Hz 
<u>b) Bandwidth of instrument </u>
W / Wn = 
W / Wn = 0.8246
therefore Bandwidth ( W ) = Wn * 0.8246 = 246.56 * 0.8246 = 203.313 Hz 
C ) To increase the bandwidth we have to add more springs 
 
        
             
        
        
        
Translate in Spanish: lo siento, hubiera puesto 300 puntos pero los usé todos para mi última pregunta 
If you meant a different language lmk