In the potentiometer experiment, the slope of the calibration curve was found to be 25 V/m. When the unknown emf in the circuit below is 15 V then the distance (in cm) of the balance point from the left end of the wire of the wire should be: Ocm 100 cm a. 40 b. 35 С. 15 d. 64 е. 60

Three particles with charges q₁ = +10 μC, q₂ = -20 μC and q3 = +30 μC, are positioned at the vertices of an isosceles triangle with sides a = 0.1 m b = 0.06 m as shown in the Figure. How much work must we do to exchange the positions of q₁ and q3 ? Give your answer in Joules. Hint: What is the Energy of the system of 3 charges as they are and what is its Energy when the positions of 91 and 93 are exchanged? What does the difference between these energies represent?

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Please help with answer and reasoning behind the correct  answer. Thanks!

An explosion occurs 32,300 m away. Given that sound travels at 348 m/s, how many seconds will it take to hear the sound? Report answers to the nearest whole second.