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Q4) Consider the person lifting a heavy box with his back, shown in Figure below. (a) Calculate the magnitude of the force Fe-in the back muscles that is needed to support the upper body plus the box and compare this with his weight. The mass of the upper body is 55 kg and the mass of the box is 30 kg. (b) Calculate the magnitude and direction of the force F- exerted by the vertebrae on the spine at the indicated pivot point. Again, data in the figure may be taken to be accurate to three significant figures. I 8 cm- F Pivot point 10% Fa 39 35 cm 50 cm 619 CGub Wub Cobox Woox

Q4) Consider the person lifting a heavy box with his back, shown in Figure below. (a) Calculate the magnitude of the force Fe-in the back muscles that is needed to support the upper body plus the box and compare this with his weight. The mass of the upper body is 55 kg and the mass of the box is 30 kg. (b) Calculate the magnitude and direction of the force F- exerted by the vertebrae on the spine at the indicated pivot point. Again, data in the figure may be taken to be accurate to three significant figures. I 8 cm- F Pivot point 10% Fa 39 35 cm 50 cm 619 CGub Wub Cobox Woox

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Q4) Consider the person lifting a heavy box with his back, shown in Figure below. (a) Calculate the magnitude of the force Fa-in the back muscles that is needed to support the upper body plus the box and compare this with his weight. The mass of the upper body is 55 kg and the mass of the box is 30 kg. (b) Calculate the magnitude and direction of the force F- exerted by the vertebrae on the spine at the indicated pivot point. Again, data in the figure may be taken to be accurate to three significant figures. I 8 cm Pivot point 10% 29 39° 35 cm 50 cm CGub 61 Wub CGbox Woox
Transcribed Image Text:Q4) Consider the person lifting a heavy box with his back, shown in Figure below. (a) Calculate the magnitude of the force Fa-in the back muscles that is needed to support the upper body plus the box and compare this with his weight. The mass of the upper body is 55 kg and the mass of the box is 30 kg. (b) Calculate the magnitude and direction of the force F- exerted by the vertebrae on the spine at the indicated pivot point. Again, data in the figure may be taken to be accurate to three significant figures. I 8 cm Pivot point 10% 29 39° 35 cm 50 cm CGub 61 Wub CGbox Woox
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