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Phys 102 Test 2B April 2010 Take-home test. Due at 9:30 am Monday, April 12. You may use the text, your class notes, the formula sheet, and a...

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!!
Phys 102 Test 2B April 2010 Take-home test. Due at 9:30 am Monday, April 12. You may use the text, your class notes, the formula sheet, and a calculator (but no formulas stored on the calculator). No other resource (including humans) is permitted . Your solutions must be organized (as though you are writing the solution for a text book) and legible; points will be taken off if not. 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 20 o C 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? 3. A proton in a uniform electric field of 3.0 X 10 5 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?
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