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A weightlifter lifts a 8080kgkg barbell off the floor and raises it to a final height of 2.12.1mm. Calculate how much gravitational potential energy the barbell had at the top of the lift. Use g=9.8g=9.8Nkg−1Nkg −1 and include units in your final answer. Round to 00 decimal places. ΔEp=m×g×ΔhΔE p​ =m×g×Δh

Question

A weightlifter lifts a 8080kgkg barbell off the floor and raises it to a final height of 2.12.1mm. Calculate how much gravitational potential energy the barbell had at the top of the lift. Use g=9.8g=9.8Nkg−1Nkg −1 and include units in your final answer. Round to 00 decimal places. ΔEp=m×g×ΔhΔE p​ =m×g×Δh

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Solution

Para calcular la energía potencial gravitacional (ΔEp) del barbell en la altura máxima, utilizamos la fórmula proporcionada:

ΔEp=m×g×Δh \Delta E_p = m \times g \times \Delta h

Donde:

  • m m es la masa del barbell, que es 8080 kg.
  • g g es la aceleración debida a la gravedad, que es 9.8 N/kg.
  • Δh \Delta h es la altura a la que se levanta el barbell, que es 2.1 m.

Sustituyendo los valores en la fórmula:

ΔEp=8080kg×9.8N/kg×2.1m \Delta E_p = 8080 \, \text{kg} \times 9.8 \, \text{N/kg} \times 2.1 \, \text{m}

Primero, multiplicamos la masa por la gravedad:

8080kg×9.8N/kg=79184N 8080 \, \text{kg} \times 9.8 \, \text{N/kg} = 79184 \, \text{N}

Luego, multiplicamos este resultado por la altura:

79184N×2.1m=166246.4J 79184 \, \text{N} \times 2.1 \, \text{m} = 166246.4 \, \text{J}

Por lo tanto, la energía potencial gravitacional del barbell en la altura máxima es:

ΔEp=166246.4J \Delta E_p = 166246.4 \, \text{J}

Redondeando a 0 decimales, la respuesta final es:

ΔEp=166246J \Delta E_p = 166246 \, \text{J}

This problem has been solved

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