Tutorial 3: A steel section is built up of 3 plates, 300 all with 16 mm thick as shown in the Figure 3. Take yield strength of the material oy as 260 N/mm2, and 16 determine the plastic moment of resistance and shape factor. 200 Figure 3
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- Q1. A 2 kg bob moves along a circular path in the vertical plane. When the bob is at the highest point, the bob has a speed of 6 m/s. Determine the tension in the cord at this moment 2m#56Q. A woodpecker's brain is specially protected from large decelerations by tendon-like attachments inside the skull. While pecking on a tree, the woodpecker's head comes to a stop from an initial velocity of 0.565 m/s in a distance of only 2.15 mm. a. Find the acceleration in m/s² b. Find the acceleration in multiples of g (g = 9.80 m/s2) This means that you want to determine how much bigger the acceleration you calculated in part a is compared to the acceleration due to gravity, c. Calculate the stopping time (in s).
- 46.Q4. A stone was dropped from a cliff of height 100 m. Ignoring air resistance, how long will it take the stone to reach ground? juaiļ, o ú 49 49 =4 t -4.9t Q5. A stone was dropped from a cliff of height 100 m. Ignoring air resistance, what will be the final speed of the stone when it reaches ground? Q6. An object has an initial velocity of 8 m/s and acceleration of 2 m/s?, how far the object will move in 10 seconds?You have been hired as a physics professor by some aliens and taken far far away to their ‘planet’. Being curious, you wanted to find out which ‘planet’ you were on. With an alien stopwatch you determined the time for a 2.0 kg alien object released from a height of 2.5 m to hit the ground to be 1.75 s. 1. What is the acceleration due to gravity on the alien ‘planet’? 2. With what speed does the alien 2.0 kg object hit the ground?
- e = 0, + wot +at? S = Or w = wo + at v = wr w? = w; + 2a(0 – 0.) atan = ar, a. %3D Tcom - (m,F + m2; + mz73 + .·) 1= E¡m;r? Mtotal An ultracentrifuge accelerates from rest to 9.93 x 10° rpm in 1.87 min. What is its angular acceleration in radians per second squared? angular acceleration: rad/s? What is the tangential acceleration of a point 8.90 cm from the axis of rotation? tangential acceleration: m/s? What is the radial acceleration in meters per second squared and in multiples of g of this point at full revolutions per minute? radial acceleration: m/s? radial acceleration in multiples of g:A skier starts at the top of a 12º frictionless slope with a speed of 2.5 m/s. Her speed at the bottom is 15 m/s. Part A What is her acceleration on the slope? Part B What is the length of the slope? Part C How long does it take her to reach the bottom?