what power is expended by a weightlifter when lifting a 66 - kg barbell a vertical distance of 1.2 m in a…

what power is expended by a weightlifter when lifting a 66 - kg barbell a vertical distance of 1.2 m in a time interval of 1.3 s? express your answer to two significant figures and include the appropriate units. p = value units

what power is expended by a weightlifter when lifting a 66 - kg barbell a vertical distance of 1.2 m in a time interval of 1.3 s? express your answer to two significant figures and include the appropriate units. p = value units

Answer

Explanation:

Step1: Calculate the work done

Work (W = Fd), and the force (F = mg) (where (m = 66\ kg), (g= 9.8\ m/s^{2}), (d = 1.2\ m)). So (F=mg=66\times9.8\ N), and (W = Fd=(66\times9.8)\times1.2\ J). [W=66\times9.8\times1.2=66\times11.76 = 776.16\ J]

Step2: Calculate the power

Power (P=\frac{W}{t}), with (W = 776.16\ J) and (t = 1.3\ s). So (P=\frac{776.16}{1.3}\ W). [P=\frac{776.16}{1.3}\approx597.05\ W] Rounding to two - significant figures, (P = 6.0\times10^{2}\ W)

Answer:

(6.0\times 10^{2}\ W)