Question 8 If you hang a mass of 320 grams on a spring, it stretches by 5 cm. Calculate its spring constant. O .627 N/m O 62.72 N/m O 64.0 N/m O .064 N/m Question 9 Which of the following is a TRUE statement about waves? O the product of velocity and wavelength equals the frequency O water waves are examples of transverse waves O antinodes are the place where waves constructively interfere the 1st overtone is the same as the Fundamental Frequency Question 10 Which of the following is a FALSE statement about sound? O the threshold of hearing is 0 dB O infrasonic refers to frequencies lower than 20 Hz O Sonic Boom happens when objects travel at supersonic speeds O it travels faster inside water than in solidsQuestion 11 If the fundamental frequency inside an open wind instrument is 300 Hz, what will it be if you lengthen it by a factor of 4? O 1200 Hz O 75 Hz O 150 Hz O 225 Hz Question 12 Which of the following statements is true concerning waves? O their amplitude is a measure of their volume and frequency O the velocity of a wave increases when the tension in the string increases O sound is an example of a transverse wave O they transfer energy and matter from point A to point B Question 13 A tuning fork A of unknown frequency makes beats of frequency 4 Hz when struck next to a tuning fork of known frequency 468 Hz. What are the two possible frequencies of tuning fork A? O 464. 468 O 466. 472 O 464. 470 O 468. 472 O 464. 472Question 14 A student makes a "bimetallic strip" by using two strips of different metals. What will happen to this strip when it is heated? O it will not expand at all O it will expand and curve O it will contract and remain straight O it will expand and remain straight O it will contract and curve Question 15 How can the efficiency of a heat engine be increased? O increase the temperature of the heat source O increase both the temperature of the heat source and decrease the temperature of the cool reservoir O increase the temperature of the cool reservoir O decrease the temperature of the heat source O decrease the temperature of the cool reservoir Question 16 In mountain regions, food cooked in boiling water cooks slower than when cooked at sea level. If the temperature beneath the pot of boiling water is increased, the food will cook O the time of cooking won't change O faster O slower