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skad [1K]
2 years ago
8

studyhero A violin string has a length, from the bridge to the end of the fingerboard, of 50 cm. That section of the string has

a mass of only 2 g. When the violinist plays an open string (the full length) a 440 Hz A-note is heard. Determine the length of the string needed to play a 528 Hz note without adjusting the tension in the string. This is accomplished by pressing on the fingerboard at the appropriate location.
Physics
1 answer:
inessss [21]2 years ago
6 0

Answer:

= 0.517 m

Explanation:

This is a resonance exercise where the ends of the string are fixed, therefore it has a node of them, the fundamental (longest) wavelength created has the form

                λ = 2L

wave speed is related to wavelength and frequency

               v = λ f

               v = 2L f

let's calculate

                v = 2 0.50 440

                v = 440 m / s

since they indicate that the tension of the string does not change and the linear density of the string is constant, the speed of the wave also remains constant

               f =\frac{v}{2L}

let's find the length for the new resonance frequency

               L = \ \frac{v}{2f}

let's calculate

               L = \frac{440}{2 \  528}

               L = 0.5166 m

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A 1000kg car is rolling slowly across a level surface at 1 m/s heading twoards a group o fsmall innocent children. The doors are
Degger [83]

Answer:

The force required to push to stop the car is 288.67 N

Explanation:

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Mass of the car, m = 1000 kg

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The car and push on the hood at an angle of 30° below horizontal, \theta=30^{\circ}

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Let F is the force must you push to stop the car.

According work energy theorem theorem, the work done is equal to the change in kinetic energy as :

W=\dfrac{1}{2}m(v^2-u^2)F\times d=\dfrac{1}{2}m(v^2-u^2)

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