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
Solution
Para calcular la energía potencial gravitacional (ΔEp) del barbell en la altura máxima, utilizamos la fórmula proporcionada:
Donde:
- es la masa del barbell, que es 8080 kg.
- es la aceleración debida a la gravedad, que es 9.8 N/kg.
- es la altura a la que se levanta el barbell, que es 2.1 m.
Sustituyendo los valores en la fórmula:
Primero, multiplicamos la masa por la gravedad:
Luego, multiplicamos este resultado por la altura:
Por lo tanto, la energía potencial gravitacional del barbell en la altura máxima es:
Redondeando a 0 decimales, la respuesta final es:
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