Engr examples

# Engr examples - City College of San Francisco Department of...

This preview shows pages 1–6. Sign up to view the full content.

City College of San Francisco Department of Engineering ENGN 36 Engineering Mechanics: Statics Homework Problem Sets

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Set #1 1. The cable stays AB and AD help support pole AC. Knowing that the tension is 500 N in AB and 160 N in AD, determine graphically the magnitude and direction of the resultant of the forces exerted by the stays at A using a) the parallelogram law, b) the triangle rule. Answer: R = 575N at a standard angle of 247 o 2. Two forces P and Q are applied as shown at point A of a hook support. Knowing that P = 15lb and Q = 25 lb, determine graphically the magnitude and direction of their resultant using a) the parallelogram law, b) the triangle rule. Answer: R = 37 lb at a standard angle of -76 o 3. Two control rods are attached at A to lever AB. Using trigonometry and knowing that the force in the right-hand rod is F 2 = 80 N, determine a) the required force F 1 in the left-hand rod if the resultant R of the forces exerted by the rods on the lever is to be vertical, b) the corresponding magnitude of R . Answer: F 1 = 89.2N R = 55.8 N
Set #2 1. While emptying a wheelbarrow, a gardener exerts on each handle AB a force P directed along line CD. Knowing that P must have a 135-N horizontal component, determine a) the magnitude of the force P , C b) its vertical component. A 40 o D Answer: P=176.2N Py =113.3N B 2. Activator rod AB exerts on crank BCD a force P directed along line AB. Knowing that P must have a 25-lb component perpendicular to arm BC of the crank, determine a) the magnitude of the force P , b) its component along line BC. Answer: P=25.9 lb P x =6.7 lb 3. Knowing that α = 65 o , determine the resultant of the three forces shown. Answer: R = 1019N at a standard angle of 26.1 o

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Set #3 1. Knowing that α = 25 o , determine the tension a) in cable AC, b) in rope BC. Answer: T AC =5.23 kN T BC =0.503 kN 2. A chairlift has been stopped in the position shown. Knowing that each chair weighs 300 N and that the skier in chair E weighs 890 N, determine the weight of the skier in chair F. Answer: W=1309 N 3. Two forces P and Q are applied as shown to an aircraft connection. Knowing that the connection is in equilibrium and that the magnitudes of the forces exerted on rods A and B are F A = 600 lb and F B = 320 lb, determine the magnitudes of P and Q . Answer: Q=42.1 lb P = 457 lb 4. Two cables tied together at C are loaded as shown. Determine the range of values of W for which the tension will not exceed 1050 N in either cable. Answer: 0 <= W <= 609N
Set #4 α 1. The cabin of an aerial tramway is suspended from a set of wheels that can roll freely on the support cable ACB and is being pulled at a constant speed by cable DE. Knowing that α = 42 o and β = 32 o , that the tension in cable DE is 20 kN, and assuming the tension in cable DF to be negligible, β determine a) the combined weight of the cabin, its support system, and its passengers, b) the tension in the support cable ACB.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 08/11/2010 for the course ENGN 36 taught by Professor F during the Spring '10 term at Punjab Engineering College.

### Page1 / 50

Engr examples - City College of San Francisco Department of...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online