A 4.0-g string is 0.36 m long and is under tension. The string vibrates at 500 Hz in its third harmonic. What is the wavelength of the standing wave in the string?
A) 0.24 m
B) 0.36 m
C) 0.54 m
D) 0.72 m
E) 0.90 m
Question 2
Two tiny particles having charges of +7.00 C and -9.00 C are placed along the y-axis. The +7.00-C particle is at y = 0.00 cm, and the other particle is at y = 40.00 cm.
Where must a third charged particle be placed along the y-axis so that it does not experience any net electric force due to the other two particles?
A) 0.200 m
B) 2.99 m
C) -0.187 m
D) -2.99 m
E) 0.187 m
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