COLLEGE PHYSICS
2nd Edition
ISBN: 9781711470832
Author: OpenStax
Publisher: XANEDU
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Chapter 9, Problem 9CQ
To determine
Which of the given simple machine is most analogous to scissors.
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To get in shape, you head to the local gym to exercise by lifting weights. Using a lat machine as shown in the figure, you
notice that the wire connected to the bar is run around three different pulleys and is connected to a vertical stack of weights
on the other end. The weights move up as you pull down on the bar. Suppose you set the machine so that the weight to be
lifted is 124.5 Ib. When you pull down on the bar, exerting a constant force, the acceleration experienced by the weights is
0.215 m/s?. What tension must exist in the wire connecting the bar and weights under these conditions? Assume the pulleys
are massless and frictionless.
N
Pulley 1
Pulley 3
Pulley 2
1) Prof. K. climbed a wall and is now stuck and hungry. One of her ME 242 students saw this
opportunity to test one of their pulley mechanisms to lift some pizza boxes for Prof. K. If the
student is pulling the free end with a velocity of 2.75 ft/s.
a) What is the mechanical advantage between the student and the pizza boxes? Hint: The
link between pulleys 1 and 4 is rigid (meaning that they must move together. This is the
key to solving this problem!
b) What is the velocity of the pizza boxes? Be sure to indicate which direction it is moving.
[Ans. to check: 1.375 ft/s]
2
1
TTT
PizzA
You are to design a pick-and-place robot using an RRPR 4 DOF SCARA (Selective Compliance Assembly Robot Arm) robot shown in the figure below. Take L1 = 0.5 m, L2 = 0.4 m, L3 = 0.1 m, and L4 = 0.3 m.
1.Redraw the robot in a clean and tidy way, then assign the frames to the joints using the DH convention. You MUST follow the depicted orientation and direction of the joints.
2.Using the D-H method, construct the Joint/Link Parameter Table.
Chapter 9 Solutions
COLLEGE PHYSICS
Ch. 9 - What can you say about the velocity of a moving...Ch. 9 - Under what conditions can a rotating body be in...Ch. 9 - What three factors affect the torque created by a...Ch. 9 - A wrecking ball is being used to knock down a...Ch. 9 - Mechanics put a length of Pipe over the handle of...Ch. 9 - Prob. 6CQCh. 9 - Explain the need for tall towers on a suspension...Ch. 9 - When visiting some countries, you may see a person...Ch. 9 - Prob. 9CQCh. 9 - Prob. 10CQ
Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Certain of dinosaurs were bipedal (walked on two...Ch. 9 - Swimmers and athletes during competition need to...Ch. 9 - If the maximum force the biceps muscle can exert...Ch. 9 - Suppose the biceps muscle was attached through...Ch. 9 - Explain one of the reasons why pregnant women...Ch. 9 - (a) When opening a door, you push on it...Ch. 9 - When tightening a bolt, you push perpendicularly...Ch. 9 - Two children push on opposite sides of a door...Ch. 9 - Use the second condition for equilibrium (net =0 )...Ch. 9 - Repeat the seesaw problem in Example 9.1 with the...Ch. 9 - Prob. 6PECh. 9 - Two children of mass 20.0 kg and 30.0 kg sit...Ch. 9 - Prob. 8PECh. 9 - A person carries a plank of wood 2.00 m long with...Ch. 9 - Prob. 10PECh. 9 - Prob. 11PECh. 9 - Prob. 12PECh. 9 - Prob. 13PECh. 9 - Prob. 14PECh. 9 - Prob. 15PECh. 9 - Prob. 16PECh. 9 - To get up on the roof, a person (mass 70.0 kg)...Ch. 9 - Prob. 18PECh. 9 - Prob. 19PECh. 9 - Suppose you needed to raise a 250-kg mower a...Ch. 9 - Prob. 21PECh. 9 - Prob. 22PECh. 9 - Prob. 23PECh. 9 - Prob. 24PECh. 9 - Prob. 25PECh. 9 - Prob. 26PECh. 9 - Prob. 27PECh. 9 - Prob. 28PECh. 9 - Prob. 29PECh. 9 - Prob. 30PECh. 9 - Prob. 31PECh. 9 - Prob. 32PECh. 9 - Prob. 33PECh. 9 - Prob. 34PECh. 9 - Prob. 35PECh. 9 - Integrated Concepts Suppose we replace the 4.0-kg...Ch. 9 - Prob. 37PECh. 9 - You have just planted a sturdy 2-m-tall palm tree...Ch. 9 - Unreasonable Results Suppose two children are...Ch. 9 - Construct Your Own Problem Consider a method for...Ch. 9 - Prob. 1TPCh. 9 - Prob. 2TPCh. 9 - Prob. 3TPCh. 9 - Prob. 4TPCh. 9 - Prob. 5TPCh. 9 - Prob. 6TPCh. 9 - Prob. 7TPCh. 9 - Prob. 8TPCh. 9 - Prob. 9TPCh. 9 - Prob. 10TPCh. 9 - Prob. 11TP
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