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Svetllana [295]
3 years ago
5

Could I get help on this question . I’m scared I’m wrong

Physics
2 answers:
vfiekz [6]3 years ago
8 0

Answer:

That should be correct

Explanation:

goldfiish [28.3K]3 years ago
5 0

Answer:

It is correct!

Explanation:

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If a guitar string vibrates 20 times each second,what is its frequency?
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A string is fixed at both ends and vibrating at 140 Hz, which is its third harmonic frequency. The linear density of the string
loris [4]

Answer:

Length of the string = 0.24 m

Explanation:

The frequency (f) of vibration of stringed instruments is related to the Tension (T) in the spring by the relation

fₙ = (n/2L)√(T/μ)

where n = 1,2,3,4...

For third harmonic frequency, n = 3

L = length of the string = ?

T = tension in the string = 2.3 N

μ = linear density = 4.6 × 10⁻³ kg/m

f = frequency = 140 Hz

L = (n/2f)√(T/μ)

L = (3/(2×140))√(2.3/0.0046) = 0.40 m

4 0
4 years ago
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A 1180kg car is moving at a speed of 85.5 km/h. Find the force needed to bring the car to rest in a distance of 300m
yarga [219]

Answer:

1110 N

Explanation:

First, find the acceleration.

Given:

Δx = 300 m

v₀ = 85.5 km/h = 23.75 m/s

v = 0 m/s

Find: a

v² = v₀² + 2aΔx

(0 m/s)² = (23.75 m/s)² + 2a (300 m)

a = -0.94 m/s²

Find the force:

F = ma

F = (1180 kg) (-0.94 m/s²)

F = -1110 N

The magnitude of the force is 1110 N.

3 0
3 years ago
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