1. A violinist places her finger so that the vibrating section of a 1.0 g/m string has a length of 30 cm, then she draws her bow across it; the string vibrates in its fundamental mode. A listener nearby in a 20oC room hears a note with a wavelength of 40 cm. What is the tension in the string?
2. What are the strength and direction of the electric field at the position indicated by the dot in the diagram? see attached!!!
3. A proton in a uniform electric field of 3.0 X 105 N/C is moving with an initial speed of 800,000 m/s in the direction direction opposite the direction of the field. After traveling a distance d, It is brought to rest (for an instant) before moving in the reverse direction.
a) What was the proton’s initial kinetic energy?
b) What was the change in the proton’s potential energy over the distance d?
c) Through what potential difference did it move before coming to rest?
c) How far did it travel before coming to rest?
PLEASE INCLUDE CALCULATIONS!!
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