Question No. 2 At the instant shown, the 50-lb bar rotates clockwise at 2 rad/s. The spring attached to its end always remains vertical due to the roller guide at C. If the spring has an unstretched length of 2 ft and a stiffness of k = 6 lb/ft, determine the angular velocity of the bar the instant it has rotated 30° clockwise.
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- 1. The disk is originally rotating at ω0 = 12 rad/s (Figure 1). If it is subjected to a constant angular acceleration of α = 20 rad/s2, determine the magnitudes of the velocity and the n and t components of acceleration of point A at the instant t = 2 s. 2. The disk is originally rotating at ω0 = 12 rad/s (Figure 1). If it is subjected to a constant angular acceleration of α = 20 rad/s2, determine the magnitudes of the velocity and the n and t components of acceleration of point B when the disk undergoes 2 revolutions.Dan applied different torque values to an object to determine its diameter. She applied a torque, to a solid sphere [ I=(2/5) mr^2] of mass m. The object accelerated at 5.72 rad/s^2. What is the value of the diameter of the object? Tip: the object rotates without slipping. Use the following: torque=11.9 nvm and m=50.7 kgASK YOUR TEACHER The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.68 m and 1.01 m, respectively. The respective rotational speeds are 453 rev/min and 4,120 rev/min. Calculate the speeds of the tips of both rotors. main rotor m/s tail rotor m/s Compare these speeds with the speed of sound, 343 m/s. vmain rotor = vsound vtail rotor = vsound
- Gear B is rigidly attached to drum A and is supported by two small rollers at E and D. Gear B is in mesh with gear C which is subjected to a torque of M= 54 N.m. Determine the angular velocity of the drum A after C has rotated 18 revolutions, starting from rest. Gear B and the drum have a mass of 100 kg and a radius of gyration about their rotating axis of 250 mm. Gear C has a mass of 30 kg and the radius of gyration about its rotating axis of 125 mm. 300 mm 200 mm- 150 mm B M = D N-mThe bar is rotating in the counterclockwise direction with angular velocity w. The magnitude of the velocity of point A is 6.1 m/s. Determine the magnitude of velocity of point B in m/s. L = 0.43 m L2 = 0.25 mThe disk has a weight of 10 lb and is subjected to a vertical force P=8 lb and a couple moment M= 5 lb⋅ft. The spring is originally unstretched. (Figure 1)
- The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.52 and 1.05 m, respectively. The respective rotational speeds are 452 rev/min and 4,120 rev/min. Calculate the speeds of the tips of both rotors. Main rotor____m/s Tail rotor____m/s Compare these speeds with the speed of sound, 343 m/s. V Main rotor=____v sound V tail rotor=____v soundWhat is the angular acceleration (in rad/s^2) of an upper cut punch if velocity at t = 0.15 is 8.1 deg/s and the velocity at t = 0.41 is 13.9 deg/s? Round your answer to two decimal points. If the radius during the uppercut is .92m, what is the tangential acceleration experienced by the knuckles? Round your answer to two decimal pointssolve 1,2,3
- Figure m₂ (@ R (1) m₁ 1 of 1 Part A If the angular velocity w is held constant, by what factor must R change to double the rotational kinetic energy of the dumbbell in the figure(Figure 1)? R'/R= Submit Provide Feedback IVD ΑΣΦ Request Answer -) ?A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. The string rotates at an angular speed of 46 rev/s, and its tip has a tangential speed of 60 m/s. What is the length of the rotating string? Number Type your answer here Units Choose your answer hereThe 5-kg cylinder is initially at rest when it is placed in contact with the wall B and the rotor at A. Part A If the rotor always maintains a constant clockwise angular velocity w = 6 rad/s, determine the initial angular acceleration of the cylinder. The coefficient of kinetic friction at the contacting surfaces B and C is uk = 0.2. (Figure 1) Express your answer with the appropriate units. ? a = Value Units Submit Request Answer Figure 1 of 1 Provide Feedback Next > 125 mm 45 P Pearson