# Exercicios resolvidos mecanica vetorial para engenheiros

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COSMOS: Complete Online Solutions Manual Organization System

Chapter 2, Solution 1.

(a)

(b)

We measure:

R = 37 lb, α = 76° R = 37 lb
76° !

Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr., Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell © 2007 The McGraw-Hill Companies.

COSMOS: Complete Online Solutions Manual Organization System

Chapter 2, Solution 2.

(a)

(b)

We measure:

R = 57 lb, α = 86° R = 57 lb
86° !

Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr., Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell © 2007 The McGraw-Hill Companies.
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(b) R = 13.95 lb !

Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr., Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell © 2007 The McGraw-Hill Companies.

COSMOS: Complete Online Solutions Manual Organization System

Chapter 2, Solution 10.

Using the Law of Sines:

60 N 80 N = sin α sin10° or α = 7.4832°

β = 180° − (10° + 7.4832° )
= 162.517°

Then:
R 80 N = sin162.517° sin10° or R = 138.405 N

(a) (b)

α = 7.48° !
R = 138.4 N !

Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr., Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell © 2007 The McGraw-Hill Companies.

COSMOS: Complete Online Solutions Manual Organization System

Chapter 2, Solution 11.

Using the triangle rule and the Law of Sines Have:

β = 180° − ( 35° + 25° )
= 120°

Then:

P R 80 lb = = sin 35° sin120° sin 25°

or (a) P = 108.6 lb ! (b) R = 163.9 lb !

Vector Mechanics for Engineers: Statics and Dynamics, 8/e, Ferdinand P. Beer, E. Russell Johnston, Jr., Elliot R. Eisenberg, William E. Clausen, David Mazurek, Phillip J. Cornwell © 2007 The McGraw-Hill Companies.

COSMOS: Complete Online Solutions Manual Organization System

Chapter 2, Solution 12.

Using the triangle rule and the Law of Sines (a) Have:
80 lb 70 lb = sin

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