Trabajos

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•11–1. The 200-kg crate is on the lift table at theposition
u = 30°. Determine the force in the hydraulic cylinder AD
for equilibrium. Neglect the mass of the lift table’s
components.

H

I

1.2 m

F
1.2 m

D

E

C

u
B

A

1 034

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11–2. The uniform rod OA has a weight of 10 lb. When the
rod is in a vertical position, u = 0°, the spring is unstretched.
Determine the angle u for equilibrium if the end of the spring
wraps around the periphery of the disk as the disk turns.

2ft

A

u

O
0.5 ft

k

1035

30 lb/ft

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© 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.11–3. The “Nuremberg scissors” is subjected to a
horizontal force of P = 600 N. Determine the angle u for
equilibrium. The spring has a stiffness of k = 15 kN> m and
is unstretched when u = 15°.

E
u

200 mm
A
k

B
200 mm

D

1 036

C

P

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*11–4. The “Nuremberg scissors” is subjected to a
horizontal force of P = 600 N. Determine the stiffness k of
the spring for equilibrium when u = 60°. The spring is
unstretched when u = 15°.E
u

200 mm
A
k

B
200 mm

D

1 037

C

P

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•11–5. Determine the force developed in the spring
required to keep the 10 lb uniform rod AB in equilibrium
when u = 35°.

k

15 lb/ft

M = 10 lb ft
6 ft
u
A

1 038

B

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11–6. If a force of P = 5 lb is applied to the handle of the
mechanism, determine the force the screw exerts on the cork
of the bottle. The screw is attached to the pin at A and passes
through the collar that is attached to the bottle neck at B.

P

5 lbD

A
u
3 in.

1 039

B

30°

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11–7. The...