Physics, 09.09.2021 01:10 trying1to1pass

The lowest note on a piano is 27.5 Hz. To fit inside the piano,
the string for the low note can't be
longer than 1.20 m. If it takes the
full length, what is the speed of
the wave in the string?
(Unit = m/s)

Answers: 3

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Answer from: Quest

it's a b and

Answer from: Quest

Perhaps seek some professional ? it isn't very asking some children who are just trying to find out answers to homework.also, it seems professional would actually be good to you. obviously it isn't going to magically fix your depression, but it'll do something. drugs, smoking weed, it won't do much, especially if your husband is against it. if you do it he'll dislike it. but talk to him, try and get him to listen to you, and figure everything out together, okay? there's a website- maybe it can offer some ?

Answer from: Quest

In the conservation of mass, mass (which is the same as energy) can never be created or destroyed in the same way oil is formed from the remains of small animals and plants that died and fell to the bottom of the sea and their mass (energy) is conserved as oil.

Answer from: Quest

Part a: using momentum conservation we have: direction x: (15) (7.0) + 0 = (15) (4.2) cos (-20 °) + (10) v₂ (f) cosθ (10) v₂ (f) cosθ = (15) (7.0) - (15) (4.2) cos (-20 °) (eq 1) direction y: 0 + 0 = (15) (4.2) sin (-20 °) + (10) v₂ (f) sinθ (10) v₂ (f) sinθ = - (15) (4.2) sin (-20 °) (eq 2) we divide both equations (1) and (2): left side: (10) v₂ (f) sinθ / (10) v₂ (f) cosθ = tanθ right side: - (15) (4.2) sin (-20 °) / (15) (7.0) - (15) (4.2) cos (-20 °) clearing the angle we have: θ = tan⁻¹ [- (15) (4.2) sin (-20 °) / (15) (7.0) - (15) (4.2) cos (-20 °)] θ = 25 ° we use any of the equations to find the speed. from (2) we have: (10) v₂ (f) sinθ = - (15) (4.2) sin (-20 °) v₂ = - (15) (4.2) sin (-20 °) / (10) sin25 ° answer: v₂ = 5.1m / s note: θ = 25 ° (direction is in the first quadrant, north of east) part b: initial kinetic energy: k (i) = 0.5 (15) (7.0) ² = 370j (rounded) final kinetic energy: ke (f) = 0.5 (15kg) (4.2m / s) ² + 0.5 (10kg) (5.1m / s) ² = 260j (rounded) answer: a difference of 110j, so it was an inelastic collision.

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The lowest note on a piano is 27.5 Hz. To fit inside the piano,
the string for the low note...

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