3-31. In order to raise the lamp post from the position shown, the force Fon the cable must create a counterclockwise moment of 2250 N•m about point A. Determine the magnitude of F that must be applied to the cable. 6 m 75° 3 m
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- A cylindrical bar with a sphere firmly attached to one end is originally at rest in a horizontal position. The bar is pivoted about a free hinge at one end (Figure 8-61). The bar is 4.00 m long and has a mass of 231 kg. The sphere has a radius of 60.0 cm and a mass of 53.0 kg. A variable torque is applied to lift the bar by rotating it 37.0° about the pivot at a constant angular speed. Calculate the work done by the variable torque.In the figure below, two 8.00 kg blocks are connected by a massless string over a pulley of radius 2.90 cm and rotational inertia 8.00 x 10-4 kg • m2. The string does not slip on the pulley; it is not known whether there is friction between the table and the sliding block; the pulley's axis is frictionless. When this system is released from rest, the pulley turns through 0.150 rad in 60.0 ms, and the acceleration of the blocks is constant. T (a) What is the magnitude of the pulley's angular acceleration? rad/s2 (b) What is the magnitude of either block's acceleration? m/s2 (c) What is the string tension T1? N#9
- Calculate the mass moment of inertia for a rectangular plate for the H-H axis shown in the link. The mass of the plate is 8 kg, a = 5 m and b = 1 m. (Need a solution in 1hr)*6-60. Determine the moment of inertia for the area about the x axis 100 mm 200 mmDiscuss why the differences in peak torque and average power between the two speeds 60 and 180°/sec during extension. Can you relate these differences to the measurements of strength and power? Why? Use the force-velocity curve to answer this question Extension Peak Torque (N/M) Peak Torque (N/M) 60•/sec Flexion 60°/sec 180°/sec 180•/sec s1 160.7 119.2 s1 78.3 75.3 S2 90.8 57.2 S2 49.3 36.7 S3 132 104.9 S3 89.3 68.2 S4 127.1 88.4 S4 58.8 48.1 S5 213.3 151 S5 98.9 72.3 S6 138.2 104.2 S6 61.8 55.7 S7 115.4 84.1 S7 49.2 40.8 S8 117.5 82.1 S8 59.7 40.2 S9 119.5 80 S9 62.3 43.2 s10 113.7 79.9 S10 53.6 38 s11 122.5 89.2 S11 57.6 33.8 Average 132 95 Average 65 50 Extension Average Power (W) Flexion Average Power (W) 60°/sec 180•/sec 60•/sec 180•/sec s1 120.2 202.5 s1 66.9 113.4 S2 80.9 134.8 S2 45.7 77.1 S3 117.5 272.6 S3 74.7 147.3 S4 116.2 192.2 S4 55.1 105.1 S5 130 255 S5 67.3 108.5 S6 118.9 164.2 S6 59.6 114.7 S7 94.1 187.4 S7 47.7 98.9 S8 94.7 128.9 S8 44 55.2 S9 97.3 130.4 S9 48.1 60.6…