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zheka24 [161]
4 years ago
14

Class II levers like ankles and wheelbarrows are useful because they provide mechanical advantage, by amplifying the input force

to provide a greater output force. In other words, we can lift a load without having to lift the full weight of the load. Prove using a mathematical relation that Class II levers provide mechanical advantage. You will need to use the rotational equilibrium condition. It will be helpful to draw a picture indicating the movement of the load. Also, to simplify we can assume the force is still perpendicular to by considering the case when the load just starts to move.

Physics
1 answer:
marusya05 [52]4 years ago
8 0

Answer:

The solution and the explanation are in the Explanation section.

Explanation:

According to the diagram that is in the attached image, the EFFORT force at point A and the load is at O point. The torque due to weight is:

TA = W * (a * cosθ)

The torque due to effort at C point is:

TC = E * (b * cosθ)

The net torque is equal to 0, we have:

Tnet = 0

W * (a * cosθ) - E * (b * cosθ) = 0

E=W\frac{a}{b}

From the figure, you can observe that a/b < 1, thus E < W

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Ainat [17]

Answer: 2.85 N.s

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A 1400.0 kg car crests a 3200.0 m pass in the mountains and briefly comes to rest. The car descends 1000 m before climbing and c
rjkz [21]

Answer:

a) v = 88.54 m/s

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Explanation:

Given that;

m = 1400.0 kg

a)

by using the energy conservation

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mg × ( 3200-2800) = 1/2 ×m×v²

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b)

Work done by all forces is equal to change in KE

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we substitute

1400 × 9.8 × ( 3200-2800) - (5 × 10⁶) = 1/2 × 1400 × (vf²  -0 )

488000 = 700 vf²

vf² = 488000 / 700

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4 0
4 years ago
Una mochila tiene una masa de 5.9 Kg y se mueve con una aceleración de: 0.53 m/ seg2. ¿ Cuál es la fuerza que debe aplicar ?.
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Answer:

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Del enunciado de la segunda ley del movimiento de Newton;

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Dónde;

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a = aceleración del cuerpo

Sustitución de valores;

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valentinak56 [21]

Answer:

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