# TOPIC D: ROTATION EXAMPLES SPRING 2018

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1 TOPIC D: ROTATION EXAMPLES SPRING 018 Q1. A car accelerates uniformly from rest to 80 km hr 1 in 6 s. The wheels have a radius of 30 cm. What is the angular acceleration of the wheels? Q. The University of Manchester geotechnical centrifuge (which needs mending) has a diameter of 6.4 m. At what angular velocity must it rotate to create an acceleration of 100g? (g = 9.81 m s is the acceleration due to gravity at British latitudes and is a benchmark for terrestrial accelerations.) Q3. A marble run consists of a chute running into a vertical circular track of radius r. A marble is released at the top of the chute, a height r above the ground. Show that, whilst still in contact with the track, its speed is given by v gr(1 cosθ), where θ is the angle with the upward vertical. By resolving radially, find an expression for the normal reaction force whilst in contact with the track. (c) Show that, when the marble leaves the track, cos θ 3 and find its vertical component of velocity at this point. (d) Find the maximum height above the ground that the marble reaches after leaving the track. r P Q4. An object of mass 0.4 kg is whirled around a fixed point by a light elastic rope, natural length 3 m and modulus of elasticity 50 N. If the rope makes a constant 15 angle with the horizontal find: the tension in the rope; the length of the rope whilst the object is being whirled around; (c) the speed of the object; (d) the time taken to make 10 complete rotations. Mechanics Examples for Topic D (Rotation) - 1 David Apsley

2 Q5. A demolition ball of mass 800 kg is suspended by a chain of length 15 m. When hanging vertically it just touches a wall. The ball is pulled aside through an angle of 55 and released. With what speed does the ball hit the wall? What is the tension in the chain when it hits the wall? (You may neglect the dimensions of the ball and treat it as a particle.) Q6. Calculate (under reasonable modelling assumptions) the moment of inertia of: a plate (diameter 30 cm, mass 50 g) about a perpendicular symmetry axis; a football (mass 430 g, circumference 69 cm) about a diameter; (c) a solid door (dimensions mm, density 500 kg m 3 ) about its hinges. Q7. Calculate the kinetic energy of: a turntable (diameter 300 mm, mass 0.4 kg) rotating at 45 rpm; a solid plastic sphere (diameter 0.1 m, mass 5 kg) rolling at 4 m s 1. Q8. An engine with power 0 kw drives a shaft at 3000 rpm. What is the torque that it provides to the shaft? Q9. A uniform rod, length 0.5 m, is free to rotate in a vertical plane about an axis at one end. If it is released from horizontal, find its angular velocity when it passes through vertical position. Q10. A particle of mass kg is attached to one end of a uniform rod of length and mass 5 kg. The other end of the rod is freely pivoted at a fixed point O. The particle is released from rest with the rod making an angle of 60 with the upward vertical through O. Calculate the speed of the particle when the rod is horizontal; vertical. O rod, mass 5 kg kg Mechanics Examples for Topic D (Rotation) - David Apsley

4 Q14. (Exam 015) A plane lamina consists of a rectangle from which a circular hole is cut (see right). Dimensions are given in the figure, which is leftright symmetric. The lamina is suspended from a frictionless pin at corner A. Find: (i) the area of the lamina; (ii) the position of the centre of mass of the lamina; (iii) the radius of gyration of the lamina about an axis through A perpendicular to the plane of the lamina. If the lamina is released from rest in a vertical plane, with side AB initially horizontal, explain what energy changes will happen immediately afterwards and calculate its maximum angular velocity in the subsequent motion. 3 m A 1.6 m 0.6 m B Data: the moment of inertia of: a rectangular lamina, mass M, sides w and h, about an axis through its centre and 1 perpendicular to its plane is M ( w h ) ; 1 a circular lamina, mass M and radius R, about an axis through its centre and perpendicular to its plane is 1 MR. Q15. (Exam 014) A wind-turbine rotor can be modelled mathematically as a solid cylinder of mass 00 kg, radius and three rods, each of mass 300 kg and length 14. m, extending perpendicularly from the surface of the cylinder. radius Find the moment of inertia of the rotor about the A central axis A. 14. m When the rotor is rotating at ω rad s 1, the wind imparts a driving torque on the rotor given (in N m) by 1000(16 8ω ω ) whilst friction and electromagnetic effects give a retarding torque of magnitude 1000ω in the same units. (i) Write down the equation of angular motion for the rotor. (ii) Hence, find the initial angular acceleration and the final angular velocity. (c) At the final angular velocity from (ii), what is the speed of a blade tip and the kinetic energy of the rotor? Mechanics Examples for Topic D (Rotation) - 4 David Apsley

5 0. m axis of rotation 0.3 m Q16. Find the radius of gyration of the flat ring shown about an axis tangential to the perimeter. Q17. By breaking the shape down into infinitesimal elements, use integration to find the moments of inertia of: x y an elliptical lamina (mass M, shape 1) about the x axis. b a a solid ellipsoid formed by rotating the shape in part through 360 about the x axis. Q18. A frame consists of three thin rods, each of length L and mass M, rigidly joined in the form of an equilateral triangle. The frame is allowed to swing freely in a vertical plane about a horizontal axis through one vertex A. A Find (in terms of M, L and the gravitational acceleration g): the distance of the centre of mass from A; the moment of inertia of the frame about A; (c) the maximum angular velocity of the frame if it is rotated to its highest point and then released. Q19. (Lee) A garden gate can be modelled as a rectangular lamina of width 0.9 m and mass 0 kg. It is kept shut by a spring mechanism which applies a couple equal to 4(1+θ) N m when the gate is opened through an angle θ radians. The gate is opened through 1.5 radians and then allowed to shut naturally. Find the moment of inertia of the gate about its hinges. (c) Find the work that must be done to open the gate 1.5 radians. Assuming that there is no loss of energy due to friction, find the angular speed of the gate just before it shuts. Mechanics Examples for Topic D (Rotation) - 5 David Apsley

6 Q0. (Exam 01) A uniform plane lamina of area mass density σ = 5 kg m has the dimensions shown right. It is suspended from a smooth horizontal axis passing through the point O. Find: the mass of the lamina; the distance of the centre of mass G from O; (c) the moment of inertia about O. 0. m 0.4 m O G The bottom of the lamina is now pulled aside so that OG is 70 from the downward vertical. (d) Find the maximum angular velocity in the subsequent motion. 0.5 m Data For a rectangle of dimensions a b, the radius of gyration about an axis through its centre and perpendicular to its plane is ( a b ) / 1. For a semi-circular lamina of radius R, the centre of mass is a distance 4R / 3π from the centre of its base and the radius of gyration about an axis through the centre of its base and perpendicular to its plane is R /. Q1. (Exam 013) A wheel consists of a thin circular plate of radius.4 m and area mass density 3 kg m, with four circular holes of radius 0.7 m whose individual centres are 1.5 m from the centre of the wheel. Find the moment of inertia of the wheel about an axis through its centre and perpendicular to its plane. A light inextensible cable is wound around the wheel and attached to a mass 5 kg. The mass is allowed to drop from rest, causing the wheel to rotate about its centre. Find: the acceleration of the mass; (c) the angular velocity of the wheel when the mass has dropped by 10 m. Mechanics Examples for Topic D (Rotation) - 6 David Apsley

7 Q. (Exam 017) A wheel can be modelled as a thin hoop of mass 4 kg and radius 0.5 m and 4 spokes, each of mass 6 kg, radiating from the centre to the rim (figure a). (c) (d) Find the moment of inertia of the wheel about an axis through its centre and perpendicular to its plane. Find the kinetic energy of the wheel if it rotates 1.4 times per second. If the wheel suddenly loses a spoke when this spoke is vertically above the centre (figure b), where is the new centre of mass of the wheel at this moment? After the loss of a spoke, what are the maximum and minimum angular velocities of the wheel in the subsequent motion, assuming that the wheel runs freely (and manages to maintain its shape)? Data. The moment of inertia of a uniform rod of mass M and length L about an axis through its end is 1 ML. 3 Q3. (Optional) A hoop rolls down an inclined ramp. The coefficient of static friction between the hoop and the ramp is μ s. If the ramp is very steep, the hoop will slip while rolling. Show that the critical angle of inclination at which slipping first occurs is given by tan θ = μ s. Q4. (Optional) A solid circular cylinder of radius 0.5 m rolls without slipping down a long slope inclined at 30. If it starts from rest what is its angular velocity after 5 s? Mechanics Examples for Topic D (Rotation) - 7 David Apsley

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