at 95.28 Hz for use in a performance,Mario is senting up two speakers which will
ID: 1793859 • Letter: A
Question
at 95.28 Hz for use in a performance,Mario is senting up two speakers which will produce a pure tone audio test. The speakers are in phase with one another. He notices that his mother-in-law, who is very sensitive to such sounds, has a seat 9.0 m from the first speaker. He wants to position the second speaker so as to minimize the sound intensity she hears. Which of these distances between her and the second speaker will be best? (The air temperature is 20° C). 13. At a performance, Mario is setting up two speakers which will p A. 14.4 m B. 1.8 m C. 9.1 m D. 9.7m E. 12.6 m 14. A tennis ball is thrown vertically upward from the surface of an atmosphere-free planet with an initial speed of 20.0 m/s. 1.0 s later, the ball is moving upward at 15.0 m/s. What is the maximum height attained by the ball? A. 2.3 m B.4.4m C. 13.3 m D. 20.0 m E. 40.0 m 15. A chamber fitted with a piston contains 1.0 mol (-6.0 × 1023 particles) of helium gas at 27°C and a pressure 1.0 atm. The piston, which has an area of 0,.020 m2, is used to compress the gas to a temperature of 127°C and a pressure of 5.0 atm. Heat necessary for the process is supplied by a heat reservoir, what is the original volume of the gas? A. 220 m3 D, 2.8 × 10-7 m3 B. 0,0022 mC.0,025 m E, 2500 m? 16. The figure is a PV graph showing three paths by which a gas can be changed from an initial state (subscript i) to a final state (subscript 0), which involves expansion from volume Vi to Which path involves the most work done by the gas? Pt A, i a f B.1f(straight line) C.ibf D. All three paths involve the same amount of work. E. It depends on the nature of the gas (e.g. monatomic, diatomic,...).Explanation / Answer
f = 95.28 Hz
v = 343 m/s
wavelength = v / f = 3.6 m
there will be destructive interference if path diff = (n +0.5) lambda where n = 0, 1 , 2 , 3 .....
delta(X) = 1.3, 5.4, 9
speaker distances = 9-1.3 , 9 + 1.3, 9 + 5.4, 9-5.4
= 7.7 , 10.3, 14.4, 3.6
Ans : (A ) 14.4 m
14. vf = vi + a t
15 = 20 - a
a =- 5 m/s^2
vf^2 - vi^2 =2 a d
0^2 - 20^2 = 2(-5)(H)
H = 40 m
Ans(E)
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