Concept explainers
The 10-in.-radius brake drum is attached to a larger flywheel that is not shown. The total mass moment of inertia of the drum and the flywheel about point C is 15 lb·ft·s2, and the coefficient of kinetic friction between the drum and the brake shoes is 0.35. When the hydraulic cylinder F is actuated, it exerts a force of 30 lb directed to the right on point B and to the left on point E. Knowing that the angular velocity of the flywheel is 360 rpm counterclockwise when F is actuated, determine the number of revolutions executed by the flywheel before it comes to rest.
Fig. P16.27 and P16.28
Want to see the full answer?
Check out a sample textbook solutionChapter 16 Solutions
VEC MECH 180-DAT EBOOK ACCESS(STAT+DYNA)
Additional Engineering Textbook Solutions
Fundamentals of Heat and Mass Transfer
Statics and Mechanics of Materials (5th Edition)
Fluid Mechanics Fundamentals And Applications
Vector Mechanics for Engineers: Statics and Dynamics
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
Statics and Mechanics of Materials
- 1. A cart is being pulled by a motor. The cart has a mass of m = 200 kg. The motor applies a horizontal force of F = 800 N to the center of the right side of the cart. The cart is 1m tall, the total length is 1.5m, the wheels are 1m apart from each other, and the center of mass G is 0.4 m above the floor and on the horizontal center. Ignore friction. If there is no rotational movement of the cart, determine the following: 1. The cart's acceleration 2. The reaction (normal) force at the front pair of wheels. 3. The reaction (normal) force at the rear pair of wheels. F 77 TI Tarrow_forwardThe 10-kg wheel is rolling under the constant moment of M = 97 N-m. The wheel has radius r= 0.59 m, has mass center at point G, and the radius of gyration is kg = 0.27 m. The coefficients of friction between the wheel and the ground is ls = 0.25 and Hk = 0.14. If the wheel rolls while slipping, determine the magnitude of the linear acceleration of point G (in m/s2). Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s?. M Garrow_forwardA ring of mass m =1 kg and radius R = 1m is attached to a vertical shaft by means of a frictionless pin. Coordinates xyz are fixed to the ring as shown and the frictionless pin at A is aligned with the x-axis. The vertical shaft precesses about the Z-axis with constant angular velocity 2 = 1 rad/s. (a) At a particular moment when 0 = 30° and = 4 rad/s, find the value of Ö . This comes from a sum of the moments about the x-axis. Do not neglect gravity. (b) Find the torque or moment necessary that must be applied about the vertical shaft in order to keep it turning at a constant rate of N = 1 rad/s. Ring R XG A 1 Ixx = lyy =mR? G Iz = mR?arrow_forward
- The homogeneous bars have a mass as follows: bar AC has a mass of 7 kg, bar ABhas a mass of 10 kg, and rod BD has a mass of 2 kg. In the drawn position, therod AC has an angular velocity of 4 rad/s and an angular acceleration of 2 rad/s2, both clockwise.Determine the magnitude of the moment M acting on the member AC. Give all the equations neededto solve this question without calculating itarrow_forwardA rotating shaft carries four unbalanced masses 18 kg, 14 kg, 16 kg and 12 kg at radii 50 mm, 60 mm, 70 mm and 60 mm respectively. The 2nd, 3rd and 4th masses revolve in planes 80 mm, 160 mm and 280 mm respectively measured from the plane of the first mass and are angularly located at 60°, 135° and 270° respectively measured clockwise from the first mass.The shaft is dynamically balanced by two masses, both located at 50 mm radii and revolving in planes mid-way between those of 1st and 2nd masses and midway between those of 3rd and 4th masses. Determine, balancing mass by drawing couple polygon and their respective angular position graphically.arrow_forwardThe 0.4 kg B pin in the figure moves freely inside the circular slide DE with radius b and the counterclockwise (positive direction) rotating arm OC. Calculate the radial (Fr) and axial (Fθ) forces using the values in the table, ignoring friction. b=211 mm θ=19 θ.=9 rad/s θ..=285 rad/s2arrow_forward
- The solid homogeneous cylinder shown has a mass of 30 kg and is rotating at 1200 rpm clockwise about a fixed horizontal axis through O. The coefficient of kinetic friction between the brake and the cylinder is 0.20. If the tension in the spring when the brake is applied is 100 N, determine the time required for the cylinder to stop rotating. Neglect the thickness of the vertical members. (Draw FBD)arrow_forwardblock C weighs 200lb is lifted by hoisting mechanism. the hoist is wrapped around compound drum B. drum b is rotating as a single unit and weighs 300 lbs. K(bar) is 4ft. a hoist tension (P) is rated 1.0 kips. And its power is being maintained by the power in Motor A. Determine the vertical acceleration of the block C and the resultant force on the bearing at O.arrow_forwardThe force F 250 N is applied to a wheel weighing 20 kg and having a radius of inertia of 150 mm as shown in the figure. This force lifts a weight B of 10 kg. Calculate the angular acceleration of the pulley and the normal acceleration of the weight B, the tension of the rope and the reaction in the bearing of the pulley.arrow_forward
- The 17-kg wheel is rolling under the constant moment of M = 85 N-m. The wheel has radius r= 0.50 m, has mass center at point G, and the radius of gyration is kg = 0.20 m. The coefficients of friction between the wheel and the ground is ls = 0.27 and Hk; = 0.22. If the wheel rolls while slipping, determine the angular acceleration of the wheel (in rad/s?). Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s?. M Garrow_forwardMechanical Engineering Questionarrow_forward4. Draw the FBD and derive the EOM of the pulley system below with respect to x using Newton's laws. Mass m slides on a rough surface with friction force f. There is no displacement in the spring initially. -Pulley. moment of inertia J,arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY