Solucionario De Fisica Tipens Capitulo 8
Páginas: 71 (17621 palabras)
Publicado: 23 de abril de 2012
8 Solutions 44918
1/27/09
1:51 PM
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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.
•8–1. Determine the minimum horizontal force P required tohold the crate from sliding down the plane. The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is ms = 0.25.
P
30
683
8 Solutions 44918
1/27/09
1:51 PM
Page 684
© 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portionof this material may be reproduced, in any form or by any means, without permission in writing from the publisher.
8–2. Determine the minimum force P required to push the crate up the plane. The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is ms = 0.25.
P
30
684
8 Solutions 44918
1/27/09
1:51 PM
Page 685
© 2010 PearsonEducation, 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.
8–3. A horizontal force of P = 100 N is just sufficient to hold the crate from sliding down the plane, and a horizontal force of P =350 N is required to just push the crate up the plane. Determine the coefficient of static friction between the plane and the crate, and find the mass of the crate.
P
30
685
8 Solutions 44918
1/27/09
1:51 PM
Page 686
© 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. Noportion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher.
*8–4. If the coefficient of static friction at A is ms = 0.4 and the collar at B is smooth so it only exerts a horizontal force on the pipe, determine the minimum distance x so that the bracket can support the cylinder of any mass without slipping. Neglect the mass of thebracket.
100 mm x
B C 200 mm A
686
8 Solutions 44918
1/27/09
1:51 PM
Page 687
© 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.
•8–5. The180-lb man climbs up the ladder and stops at the position shown after he senses that the ladder is on the verge of slipping. Determine the inclination u of the ladder if the coefficient of static friction between the friction pad A and the ground is ms = 0.4.Assume the wall at B is smooth.The center of gravity for the man is at G. Neglect the weight of the ladder.
B
G 10 ft
u 3 ft A
687 8 Solutions 44918
1/27/09
1:51 PM
Page 688
© 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.
8–6. The 180-lb man climbs up the ladder and stops at theposition shown after he senses that the ladder is on the verge of slipping. Determine the coefficient of static friction between the friction pad at A and ground if the inclination of the ladder is u = 60° and the wall at B is smooth.The center of gravity for the man is at G. Neglect the weight of the ladder.
B
G 10 ft
u 3 ft A
688
8 Solutions 44918
1/27/09
1:51 PM
Page 689...
1/27/09
1:51 PM
Page 683
© 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.
•8–1. Determine the minimum horizontal force P required tohold the crate from sliding down the plane. The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is ms = 0.25.
P
30
683
8 Solutions 44918
1/27/09
1:51 PM
Page 684
© 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portionof this material may be reproduced, in any form or by any means, without permission in writing from the publisher.
8–2. Determine the minimum force P required to push the crate up the plane. The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is ms = 0.25.
P
30
684
8 Solutions 44918
1/27/09
1:51 PM
Page 685
© 2010 PearsonEducation, 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.
8–3. A horizontal force of P = 100 N is just sufficient to hold the crate from sliding down the plane, and a horizontal force of P =350 N is required to just push the crate up the plane. Determine the coefficient of static friction between the plane and the crate, and find the mass of the crate.
P
30
685
8 Solutions 44918
1/27/09
1:51 PM
Page 686
© 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. Noportion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher.
*8–4. If the coefficient of static friction at A is ms = 0.4 and the collar at B is smooth so it only exerts a horizontal force on the pipe, determine the minimum distance x so that the bracket can support the cylinder of any mass without slipping. Neglect the mass of thebracket.
100 mm x
B C 200 mm A
686
8 Solutions 44918
1/27/09
1:51 PM
Page 687
© 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.
•8–5. The180-lb man climbs up the ladder and stops at the position shown after he senses that the ladder is on the verge of slipping. Determine the inclination u of the ladder if the coefficient of static friction between the friction pad A and the ground is ms = 0.4.Assume the wall at B is smooth.The center of gravity for the man is at G. Neglect the weight of the ladder.
B
G 10 ft
u 3 ft A
687 8 Solutions 44918
1/27/09
1:51 PM
Page 688
© 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.
8–6. The 180-lb man climbs up the ladder and stops at theposition shown after he senses that the ladder is on the verge of slipping. Determine the coefficient of static friction between the friction pad at A and ground if the inclination of the ladder is u = 60° and the wall at B is smooth.The center of gravity for the man is at G. Neglect the weight of the ladder.
B
G 10 ft
u 3 ft A
688
8 Solutions 44918
1/27/09
1:51 PM
Page 689...
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