Concept explainers
A woman is holding a 3.6-kg sphere in her hand with the entire arm held horizontally as shown in the figure. A tensile force in the deltoid muscle prevents the arm from rotating about the shoulder joint O; this force acts at the 21° angle shown. Determine the force exerted by the deltoid muscle on the upper arm at A and the x- and y-components of the force reaction at the shoulder joint O. The mass of the upper arm is
Want to see the full answer?
Check out a sample textbook solutionChapter 3 Solutions
Engineering Mechanics: Statics
Additional Engineering Textbook Solutions
Degarmo's Materials And Processes In Manufacturing
Fox and McDonald's Introduction to Fluid Mechanics
Introduction To Finite Element Analysis And Design
Engineering Mechanics: Statics
Applied Fluid Mechanics (7th Edition)
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
- The center of gravity of the 3000-lb car is at G. The car is parked on an incline with the parking brake engaged, which locks the rear wheels. Find (a) the normal forces (perpendicular to the incline) acting under the front and rear pairs of wheels; and (b) the friction force (parallel to the incline) under the rear pair of wheels.arrow_forwardThe 350-lb homogeneous plate has the shape of an isosceles triangle. The plate is supported by a thrust hinge at A, a slider hinge at B, and the cable CD. Find the force in the cable and the magnitudes of the hinge reactions.arrow_forwardThe homogeneous 20-kg door is held in the horizontal plane by a thrust hinge at O, a hinge at A, and the vertical prop BC. Determine all forces acting on the door.arrow_forward
- The uniform, 20-kg bar is placed between two vertical surfaces. Assuming sufficient friction at A to support the bar, find the magnitudes of the reactions at A and B.arrow_forwardThe 1800lbin. couple is applied to member DEF of the pin-connected frame. Find the internal force systems acting on sections 1 and 2.arrow_forward2arrow_forward
- The jib crane is designed for a maximum capacity of 9 kN, and its uniform I-beam has a mass of 260 kg. Plot the magnitude R of the force on the pin at A as a function of x through its operating range of x = 0.2 m to x = 3.4 m. On the same set of axes, plot the x- and y- components of the pin reaction at A. Do these plots on a separate piece of paper. Then answer the following questions in Wiley Plus as a check for your work. (a) What is the value of R when x = 1.6 m? (b) What is the value of R when x = 3.2 m? (c) Determine the minimum value of R and the corresponding value of x. (d) For what value of R should the pin at A be designed? 32° x m 9 KN 1.0 m 2.6 m Questions: (a) If x= 1.6 m, R= i (b) If x= 3.2 m, R = i (c) The minimum value for R = i (d) The pin should be designed to hold i KN KN kN at x = i kN.arrow_forwardRefer to the figure to the right for: The two member frame supports the 200 lb cylinder and couple moment of 475 lb.ft Determine the force of the roller at B on member AC, and the horizontal and vertical components of the forces that the pin C exerts on member CB and the pin at A exerts on member AC. The roller at C does not contact member CB. Use distances measured counterclockwise from A as 2.5 ft, 3.9 ft and 3.3 ft instead of 2 ft, 4 ft, and 4 ft respectively. B = Cx = Ax = Cy= Ay = 2 ft 4 ft -4 ftarrow_forwardThe jib crane is designed for a maximum capacity of 5 kN, and its uniform I-beam has a mass of 200 kg. Plot the magnitude R of the force on the pin at A as a function of x through its operating range of x = 0.2 m to x = 3.9 m. On the same set of axes, plot the x- and y- components of the pin reaction at A. Do these plots on a separate piece of paper. Then answer the following questions in Wiley Plus as a check for your work. (a) What is the value of R when x = 0.8 m? (b) What is the value of R when x = 3.2 m? (c) Determine the minimum value of R and the corresponding value of x. (d) For what value of R should the pin at A be designed? 40° m 5 KN -2.9 m 1.2 m Questions: (a) If x = 0.8 m, R= (b) If x= 3.2 m, R= i (c) The minimum value for R = i (d) The pin should be designed to hold i kN kN kN at x = kN.arrow_forward
- 4. Not a graded question.arrow_forwardThe jib crane is designed for a maximum capacity of 14 kN, and its uniform I-beam has a mass of 270 kg. Plot the magnitude R of the force on the pin at A as a function of x through its operating range of x = 0.2 m to x = 4.9 m. On the same set of axes, plot the x- and y- components of the pin reaction at A. Do these plots on a separate piece of paper. Then answer the following questions in Wiley Plus as a check for your work. (a) What is the value of R when x = 2.4 m? (b) What is the value of R when x = 4.5 m? (c) Determine the minimum value of R and the corresponding value of x. (d) For what value of R should the pin at A be designed? 1.6 m Questions: 25° 14 KN -3.5 m (a) If x = 2.4 m, R = (b) If x= 4.5 m, R= (c) The minimum value for R = i (d) The pin should be designed to hold i KN KN kN at x = i kN. marrow_forwardThe jib crane is designed for a maximum capacity of 14 kN, and its uniform I-beam has a mass of 270 kg. Plot the magnitude R of the force on the pin at A as a function of x through its operating range of x = 0.2 m to x = 4.0 m. On the same set of axes, plot the x- and y-components of the pin reaction at A. Do these plots on a separate piece of paper. Then answer the following questions in Wiley Plus as a check for your work. (You can disregard the plot, I only need a, b, c, and d)arrow_forward
- International Edition---engineering Mechanics: St...Mechanical EngineeringISBN:9781305501607Author:Andrew Pytel And Jaan KiusalaasPublisher:CENGAGE L