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DedPeter [7]
3 years ago
6

A 4.04 kg block slides down a smooth, frictionless plane having an inclination of 30◦. The acceleration of gravity is 9.8 m/s^2.

The acceleration of the plane is 4.9
What is the magnitude of the perpendicular force that the block exerts on the surface of the plane at a distance of 2.37 m down the incline?
Answer in units of N.
Physics
1 answer:
aleksandrvk [35]3 years ago
5 0

Answer:

Explanation:

What a lot of words to solve such a simple problem! The perpendicular force is the one that is pushing straight down on the plane. There is no side to side movement here or friction acting on this dimension at all. Perpendicular force is the same as the weight of the block. That's it! Perpendicular force is also normal force which is the same thing as weight:

w = mg so

w = (4.04)(9.8) and

w = 4.0 × 10¹ N

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375 j

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Un bloque de 20kg de masa se desplaza horizontalmente en la dirección de eje X por acción de una fuerza horizontal variable F =
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Answer:

a) El trabajo realizado por esta fuerza mientras el bloque se mueve desde la posición x = + 10 m hasta la posición x = + 20 m es 900 joules.

b) La rapidez del bloque en la posición x = + 20 metros es aproximadamente 5.701 metros por segundo.

Explanation:

a) El trabajo expermentado por el bloque (W), medido en joules, es definida por la siguiente ecuación integral:

W = \int\limits^{x_{max}}_ {x_{min}} F(x) \, dx (1)

Donde:

x_{min}, x_{max} - Posiciones mínima y máxima del bloque, medidos en metros.

F(x) - Fuerza horizontal aplicada al bloque, medida en newtons.

Si conocemos que F(x) = 6\cdot x, x_{min} = 10\,m y x_{max} = 20\,m, entonces el trabajo realizado por esta fuerza es:

W = \int\limits^{20\,m}_{10\,m} {6\cdot x} \, dx (2)

W = 6\int\limits^{20\,m}_{10\,m} x\, dx

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W = 3\cdot [(20\,m)^{2}-(10\,m)^{2}]

W = 900\,J

El trabajo realizado por esta fuerza mientras el bloque se mueve desde la posición x = + 10 m hasta la posición x = + 20 m es 900 joules.

b) La rapidez final del bloque se determina mediante de Teorema del Trabajo y la Energía, es decir:

W = K_{f}-K_{o} (3)

Donde son K_{o}, K_{f} las energías cinéticas traslacionales inicial y final, medidos en joules.

Al aplicar la definición de energía cinética traslacional, expandimos y simplificamos la ecuación como sigue:

W = \frac{1}{2}\cdot m \cdot (v_{f}^{2}-v_{o}^{2}) (4)

Donde:

m - Masa del bloque, medido en kilogramos.

v_{o}, v_{f} - Rapideces inicial y final del bloque, medidos en metros por segundo.

\frac{2\cdot W}{m} = v_{f}^{2}-v_{o}^{2}

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v_{f} = \sqrt{\frac{900\,J}{2\cdot (20\,kg)}+10\,\frac{m^{2}}{s^{2}}  }

v_{f} \approx 5.701\,\frac{m}{s}

La rapidez del bloque en la posición x = + 20 metros es aproximadamente 5.701 metros por segundo.

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