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Setler [38]
3 years ago
12

Uma garota de 50 kg esta sobre um skate de 10kg,ambos movendo se em sentido horizontal, da esquerda para a direita, a velocidade

de 2m/s com relacao ao solo. Em determinado instante, a garota pula para a frente á velocidade horizontal de 3m/s, apos o pulo, em relacao ao solo. Qual é a velocidade do skate apos o pulo da garota?
Physics
1 answer:
pashok25 [27]3 years ago
8 0

M = mass of the girl = 50 kg

m = mass of skate = 10 kg

V' = initial velocity of girl and skate together before the girl jump = 2 m/s

V = velocity of girl after the jump relative to ground = 3 m/s

v = velocity of the skate after girl jumps = ?

using conservation of momentum

(M + m) V' = MV + m v

inserting the values in the above equation

(50 + 10) (2) = (50) (3) + 10 v

v = - 3 m/s



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Potholder should have high insulation and low conductivity, therefore the correct answer is the option B

<h3>What is insulation?</h3>

Insulation is a type of material used to create barriers to the transmission of the form of energy which either is in form of heat or electricity.

For outdoor trips in cold weather, several thin layers act as better insulating barriers for heat transfer.

The ability of an electric charge or heat to pass through a material is measured by its conductivity. A material is considered a conductor if it offers very little resistance to the flow of thermal or electric energy.

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To be effective, a pot holder should have low _____. viscosity conductivity malleability density

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1 year ago
A soccer player kicks a ball, applying a force of 1,000 newtons over a distance of 0. 2 meter. The ball travels 50 meters down t
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2 years ago
A spring stretches 3.5 cm when a 9 g object is hung from it. The object is replaced with a block of mass 26 g which oscillates i
evablogger [386]

Answer:

The period of motion  of new mass T = 0.637 sec

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Given data

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F = 0.009 × 9.81 = 0.08829 N

Spring constant

k = \frac{F}{x}

k = \frac{0.08829}{0.035}

k = 2.522 \frac{N}{m}

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Now the period of motion is given by

T = 2 \pi \sqrt{\frac{m}{k} }

T = 2 \pi \sqrt{\frac{0.026}{2.522} }

T = 0.637 sec

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3 0
2 years ago
The noise level coming from a pig pen with
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Answer:

The decibel of the remaining pigs is 51.5 dB.

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Decibel (dB) is a unit of measure of the intensity of a given sound.

Number of pigs = 199, noise level = 74.3 dB.

Given that the intensity (I) of the sound from the pen is proportional to the number of pigs (N), thus:

                       I    \alpha  N

                       I = kN

where k is the constant of proportionality.

⇒                    k = \frac{I}{N}

                         = \frac{74.3}{199}

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When 61 numbers of pigs were removed, the number of remaining pigs (N) squealing at their original level is 138.

Thus, the becibel level (I) of the remaining pigs can be determined by:

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The becibel level (I) of the remaining pigs is 51.53 dB.

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Answer:

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<u>This is just the physics approach</u>, a biological approach can be given in association with sensors relating to ears.

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