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13.)
A 74.4 kg man stands on his toes by exerting an upward force through the Achilles tendon, as shown in the figure.
Part (a) In units of newtons, what is the magnitude of the force through the Achilles tendon if he stands on one foot?
Part (b) Calculate the force in units of newtons at the pivot of the simplified lever system shown. That force is representative of forces in the ankle joint.
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- 1. Convert the following and show your solution: a. 55» am mg dm3 b. 24 in? » um² с. 5'10" » т slug d. 350 pg in nm3 e. 740 2 ya? ag mm?8. Convert 125 miles/h to km/s Thr_ Go sec 125 mil hours =0.05588 . A 55.9g object that occupies 7.25mL vwould have what density?4) Estimate the surface energies of PE and PET using the Zisman approach. Hint: plot cosine of the contact angle versus surface energy of the probe liquid. YLv Ysv YsL Probe Liquid Y, in mJ/m² OLPE in deg. OL-PET in deg. 1-bromonaphthalene 44.0 dimethyl sulfoxide ethylene glycol diiodomethane 13.6 44.1 47.6 --- 48.0 77.2 49.1 50.8 44.1 31.0 formamide 57.5 75.2 56.9 glycerol 63.1 87.2 66.8 water 72.8 95.3 77.1 PE contact angle data take from Kwok et al. The PET contact angle data was taken from Wu et al.
- Would the critical angle for a glass—water interface be less than, equal to, or greater than the critical angle for a glass—air interface? Siw?137 What would afford the greatest protection from the 35 Cs source, 10 cm or lead or 25 cm of concrete? The linear attenuation coefficient of lead for y rays is 0.9 cm1 while that of concrete is 0.2 cm1.3 Using the method of separation of symbols, show that n(n-1) 2 Aux-n=ux-nU x−1 + -Ux-2 + ··· + (−1)" ux-n" ...
- 3. How is +1.5 dioptre different from –1.5 dioptre? Definedioptre.Given temperature of 37.3 0.05 What is uncertainty percentage of this temperature? а. 1 b. 0.1 с. 0.001 d. 0.0110:55 > t.myexams.unisa.ac.za MENU E Frag question A. 5.0 x 108 ft³ B. 6.0 x 108 ft³ C. 8.6 x 108 ft³ D. 2.1 x 108 ft³ E. 4.8 x 108 ft³ ||| Vol) 4G LTE2 T The largest building in the world by volume is the Boeing 747 plant in Everett, Washington. It measures approximately 650 m long, 710 yards wide, and 110 ft high. What is its volume in cubic feet? O 47 71% < myExams
- 3. When Millikan first performed the experiment, he used water droplets instead of oil. He found that he could not suspend the droplets for any length of time. In fact, they would start to move up a short time after they had been suspended. Why did the water droplets start to move up? Hint: Consider changes of state.Answer to a, b and c, only d and thresholds will be solved.a) [46,8i + 23,4j] N / Cb) 52.32N / Cc) 26.57 °Q1. Compute potential difference in thermal equilibrium between region where no = 1017 cm-3 and n, = 1015 cm-3 (Si). Q2. Compute potential difference in thermal equilibrium between region where Po = 1020 cm-3 and Po = 1016 cm-3 (Si).