Estudante

© 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher.

•5–1. Draw the free-body diagram of the 50-kg paper roll which has a center of mass at G and rests on the smooth blade of the paper hauler. Explain the significance of each force acting on the diagram. (See Fig. 5–7b.)
B

35 mm G A 30

5–2. Draw the free-body diagram of member AB, which is supported by a roller at A and a pin at B. Explain the significance of each force on the diagram. (See Fig. 5–7b.)
A 8 m 2.4ft 30

1950lb 390 N 1200lb · m 800 N ft
13 12 5

1.2ft 4 m B

0.9 m 3 ft

1950 N

1200 N · m

0.9 m

2.4 m

1.2 m

319

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6/12/09 8:42:31 AM

© 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher.

5–3. Draw the free-body diagram of the dumpster D of the truck, which has a weight of 5000 lb and a center of gravity which has a weight of 25 kN and a at G. It is supported by a pin at A and a pin-connected hydraulic cylinder BC (short link). Explain the significance of each force on the diagram. (See Fig. 5–7b.)

D 3m A

G 1m B 20

1.5 m

30

C

25 kN

*5–4. Draw the free-body diagram of the beam which supports the 80-kg load and is supported by the pin at A and a cable which wraps around the pulley at D. Explain the significance of each force on the diagram. (See Fig. 5–7b.)

D

4 3

5

A

B

E C

2m

2m

1.5 m

320

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6/12/09 8:42:32 AM

© 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is