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A uniform cylindrical wheel, with a radius of 8.50 cm and a mass of 0.580 kg is observed slowing from 1500 rpm to rest in 55s. Calculate the applied torque needed to accelerate the wheel from rest to 1500 rpm in 5.00 s

Question

A uniform cylindrical wheel, with a radius of 8.50 cm and a mass of 0.580 kg is observed slowing from 1500 rpm to rest in 55s. Calculate the applied torque needed to accelerate the wheel from rest to 1500 rpm in 5.00 s

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Solution

Primero, necesitamos convertir las unidades de la velocidad angular de rpm a rad/s.

  1. Conversión de rpm a rad/s: 1500rpm=1500×2πrad60s=1500×π30rad/s=50πrad/s 1500 \, \text{rpm} = 1500 \times \frac{2\pi \, \text{rad}}{60 \, \text{s}} = 1500 \times \frac{\pi}{30} \, \text{rad/s} = 50\pi \, \text{rad/s}

  2. Cálculo de la aceleración angular: La aceleración angular (α\alpha) se puede calcular usando la fórmula: α=ΔωΔt \alpha = \frac{\Delta \omega}{\Delta t} donde Δω\Delta \omega es el cambio en la velocidad angular y Δt\Delta t es el tiempo.

    Δω=50πrad/s0rad/s=50πrad/s \Delta \omega = 50\pi \, \text{rad/s} - 0 \, \text{rad/s} = 50\pi \, \text{rad/s} Δt=5.00s \Delta t = 5.00 \, \text{s} α=50πrad/s5.00s=10πrad/s2 \alpha = \frac{50\pi \, \text{rad/s}}{5.00 \, \text{s}} = 10\pi \, \text{rad/s}^2

  3. Momento de inercia del cilindro: El momento de inercia (II) de un cilindro uniforme alrededor de su eje es: I=12mr2 I = \frac{1}{2} m r^2 donde mm es la masa y rr es el radio.

    m=0.580kg m = 0.580 \, \text{kg} r=8.50cm=0.0850m r = 8.50 \, \text{cm} = 0.0850 \, \text{m} I=12×0.580kg×(0.0850m)2=12×0.580×0.007225=0.0020965kgm2 I = \frac{1}{2} \times 0.580 \, \text{kg} \times (0.0850 \, \text{m})^2 = \frac{1}{2} \times 0.580 \times 0.007225 = 0.0020965 \, \text{kg} \cdot \text{m}^2

  4. Cálculo del torque aplicado: El torque (τ\tau) necesario se puede calcular usando la fórmula: τ=Iα \tau = I \alpha

    τ=0.0020965kgm2×10πrad/s2=0.0020965×10π=0.0659πNm \tau = 0.0020965 \, \text{kg} \cdot \text{m}^2 \times 10\pi \, \text{rad/s}^2 = 0.0020965 \times 10\pi = 0.0659\pi \, \text{N} \cdot \text{m}

    τ0.207Nm \tau \approx 0.207 \, \text{N} \cdot \text{m}

Por lo tanto, el torque aplicado necesario para acelerar la rueda desde el reposo hasta 1500 rpm en 5.00 s es aproximadamente 0.207Nm0.207 \, \text{N} \cdot \text{m}.

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