As shown in Figure CQ5.22, student A, a 55-kg girl, sits on one chair with metal runners, at rest on a classroom floor. Student B, an 80-kg boy, sits on an identical chair. Both students keep their feet off the floor. A rope runs from student A’s hands around a light pulley and then over her shoulder to the hands of a teacher standing on the floor behind her. The low-friction axle of the pulley is attached to a second rope held by student B. All ropes run parallel to the chair runners. (a) If student A pulls on her end of the rope, will her chair or will B’s chair slide on the floor? Explain why. (b) If instead the teacher pulls on his rope end, which chair slides? Why this one? (c) If student B pulls on his rope, which chair slides? Why? (d) Now the teacher ties his end of the rope to student A’s chair. Student A pulls on the end of the rope in her hands. Which chair slides and why? Figure CQ5.22
As shown in Figure CQ5.22, student A, a 55-kg girl, sits on one chair with metal runners, at rest on a classroom floor. Student B, an 80-kg boy, sits on an identical chair. Both students keep their feet off the floor. A rope runs from student A’s hands around a light pulley and then over her shoulder to the hands of a teacher standing on the floor behind her. The low-friction axle of the pulley is attached to a second rope held by student B. All ropes run parallel to the chair runners. (a) If student A pulls on her end of the rope, will her chair or will B’s chair slide on the floor? Explain why. (b) If instead the teacher pulls on his rope end, which chair slides? Why this one? (c) If student B pulls on his rope, which chair slides? Why? (d) Now the teacher ties his end of the rope to student A’s chair. Student A pulls on the end of the rope in her hands. Which chair slides and why? Figure CQ5.22
Solution Summary: The author explains how the rope is passed from student A to the teacher through a pulley.
As shown in Figure CQ5.22, student A, a 55-kg girl, sits on one chair with metal runners, at rest on a classroom floor. Student B, an 80-kg boy, sits on an identical chair. Both students keep their feet off the floor. A rope runs from student A’s hands around a light pulley and then over her shoulder to the hands of a teacher standing on the floor behind her. The low-friction axle of the pulley is attached to a second rope held by student B. All ropes run parallel to the chair runners. (a) If student A pulls on her end of the rope, will her chair or will B’s chair slide on the floor? Explain why. (b) If instead the teacher pulls on his rope end, which chair slides? Why this one? (c) If student B pulls on his rope, which chair slides? Why? (d) Now the teacher ties his end of the rope to student A’s chair. Student A pulls on the end of the rope in her hands. Which chair slides and why?
A 686 N park ranger uses a basket and a rope-pulley system to transport an injured sea turtle up to a plateau, as shown in the
figure. The sea turtle and basket together have a mass of 50.0 kg. The ranger holds firmly onto the rope and walks away from the
cliff, speeding up at a steady rate of 0.300 m/2
2. He thereby causes the basket (and the turtle) to accelerate straight upwards at
the same rate. Assume that the rope has negligible weight and that the pulley is ideal, having no friction in its bearing. Also
assume that as the ranger trudges along, his feet do not slip on the ground.
+x
26. The tension in the rope is equal to
A. 490 N.
B. 686 N.
C. 475 N.
D. 505 N.
E. 196 N.
27. The frictional force which the ground exerts on the ranger's feet has a magnitude of
C. 526 N.
A. 490 N.
B. 511 N.
D. 196 N.
E. 707 N.
Determine the magnitude of the y-component of the reaction force at pin A (in kN). The beam AB is a
standard 0.5 m I-beam with a mass of 95 kg per meter of length.
14
l
A
0.25 m
0.5 m
0.12 m
5 m
25°
1.5 m
10 kN
B
Two blocks are connected by a string as in the figure and the system is released from rest. The coefficient of
kinetic friction between Block A and the table is 0.3. Ignore the air resistance and friction between the pulley
and the string. Find the tension in the rope.
12 kg
Pulley
m, = 12
kg
0.
82.3 N
O 117.6 N
76.44 N
58.8 N
Chapter 5 Solutions
Bundle: Physics for Scientists and Engineers, Technology Update, 9th Loose-leaf Version + WebAssign Printed Access Card, Multi-Term
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