Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 10, Problem 3PLA
Figure 10-4 Meter stick with two forces F1 and F2 acting at points shown.
For the meter stick shown in Figure 10-4, the force F1 10.0 N acts at 10.0cm. What is the magnitude of the torque due to F1 about an axis through point A perpendicular to the page? Is it clockwise, or is it counterclockwise? Show your work and give correct units.
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The angular velocity of link AB is WAB = 2.5 rad/s. Link
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Figure
Determine the angular velocity of link CB at the instant shown measured counterclockwise.
Express your answer using three significant figures. Enter positive value if the angular velocity is counterclockwise and negative value
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350 mm
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For each situation below, determine the torque caused by the force F about the axis of rotation shown. The force in
each case has a magnitude of 100 Newtons. We will use the common choice of a counterclockwise torque being
positive and a clockwise torque being negative. Make sure that your sign is correct.
1.
F
2.0 m
30°
Is the torque clockwise or counter-clockwise?
Check that the sign of your answer agrees with this.
2.
2.0 m
Is the torque clockwise or counter-clockwise?
Check that the sign of your answer agrees with this.
3.
2.0 m
90°
Force acts % of the way along the bar.
Is the torque clockwise or counter-clockwise?
Check that the sign of your answer agrees with this.
Directions: Solve the following problems and show your solution.
1. The length of a bicycle pedal arm is 0.152 m, and a downward force of 111 N
is applied to the pedal by the rider's foot. What is the magnitude of the torque
about the pedal arm pivot point when the arm makes an angle of (a) 30°, (b)
90°, and (c) 180° with the vertical?
Chapter 10 Solutions
Physics Laboratory Manual
Ch. 10 - State a definition of torque and give an equation...Ch. 10 - What are the conditions for equilibrium of a rigid...Ch. 10 - Figure 10-4 Meter stick with two forces F1 and F2...Ch. 10 - In Figure 10-4 the force F2 = 15.0 N acts at the...Ch. 10 - For the meter stick in Figure 10-4, what is the...Ch. 10 - Figure 10-5 Meter stick with forces applied by...
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- The slider block C moves at 6.5 m/s down the inclined groove. (Figure 1) Part A Determine the angular velocity of link AB at the instant shown measured clockwise. Express your answer using three significant figures. Enter positive value if the angular velocity is clockwise and negative value if the angular velocity is counterclockwise. vec WAB = rad/s Submit Request Answer Figure < 1 of 1 Part B 2 m Determine the angular velocity of link BC at the instant shown measured clockwise. Express your answer using three significant figures. Enter positive value if the angular velocity is clockwise and negative value if the angular velocity is counterclockwise. B vec 2 m WBC = rad/s Submit Request Answerarrow_forward● Calculate and record the weight values in Newtons in the table below. This will be the force exerted at that particular position on the meter stick, due to the mass that is present there. ● Calculate and record the lever arm values in meters in the table below. Lever arm is the positive distance from the pivot, calculated as the difference between recorded position values. • Calculate and record the torque values in Nm in the table below. First calculate the weight force exerted at that point, and then multiply by the lever arm. (Angles are 90° for these trials.) Further calculations and analysis will be performed in the Data Analysis section that follows. right side (all trials) left side (trial 1) left side (trial 2) left side (trial 3) 4 O R F mass 20.90 g + 50 g = kg 20.74 g + 100 g = kg 20.74 g + 50 g = kg 20.74 g + 30 g = O 96 5 T G kg weight (N) 6 B E Y & H 7 position 75.00 cm 35.65 cm 25.30 cm 15.55 cm N 99+ U # lever arm (m) 75.00-50.20 cm = 50.20-35.65 cm = m 50.20-25.30 cm…arrow_forwardUse the concept of torque to explain how a 300 N child (Jenny) and a 250 N child (Zach) can balance sitting on opposite sides of a seesaw. Based on your explanation, calculate the distance that the Jenny would need to sit from the right of the pivot point to balance the seesaw if Zach is seated 1.60 m to the left of the pivot point. Show Your Workarrow_forward
- Please only type answer For "The Atwood Machine", given the masses of the blocks (m1=2kg and m2=5kg), the mass of the pulley (M=1kg), and the radius of the pulley (R=20 cm) I would like you derive expressions for the acceleration of the system if we include the rotational motion of the pulley. Also derive expressions for the tensions involved. Explain how the acceleration would change if the system were mounted to the top of an elevator that is accelerating up at 5 m/s^2.arrow_forwardA wrench is used to apply a torque to a bolt. Forces F1 through F6 all have the same magnitude, F, and their directions are per the angle labels in the diagram. For each force, the distance from the point of application to the center of rotation is a multiple of d, as shown. Use the convention that counter-clockwise torques are positive while clockwise torques are negative. Determine the torque generated by F1 in terms of the variables and angles given in the problem statement. Recall the convention for distinguishing clockwise and counterclockwise torques.arrow_forwardBattle of the Revolving Door EXAMPLE 8.1 GOAL Apply the basic definition of torque. PROBLEM Two disgruntled businesspeople are trying to use a revolving door, as in the figure. The woman on the left exerts a force of 625 N perpendicular to the door and 1.20 m from the hub's center, while the man on the right exerts a force of 8.50 x 10² N perpendicular to the door and 0.800 m from the hub's center. Find the net torque on the revolving door. SOLUTION Calculate the torque exerted by the woman. A negative sign must be supplied because F₁, if unopposed, 1' would cause a clockwise rotation. STRATEGY Calculate the individual torques on the door using the definition of torque, and then sum to find the net torque on the door. The woman exerts a negative torque, the man a positive torque. Their positions of application also differ. Calculate the torque exerted by the man. The torque is positive because F2, if unopposed, would cause a counterclockwise rotation. Sum the torques to find the net…arrow_forward
- PRACTICE IT Use the worked example above to help you solve this problem. Two disgruntled businessmen are trying to use a revolving door, as shown in the figure. The door has a diameter of 2.60 m. The businessman on the left exerts a force of 647 N perpendicular to the door and 1.1 m from the hub's center, while the one on the right exerts a force of 806 N perpendicular to the door and 0.528 m from the hub's center. Find the net torque on the revolving door. (Indicate the direction with the sign of your answer.) N•m EXERCISE GETTING STARTED I I'M STUCK! A businessman enters the same revolving door on the right, pushing with 528 N of force directed perpendicular to the door and 0.621 m from the hub, while a boy exerts 388 N perpendicular to the door, 1.35 m to the left of the hub. (Indicate the direction with the sign of your answer.) (a) Find the torques exerted by each person. N.m Tboy Tman T = (b) Find the net torque on the door. N•m net N.m = HINTS:arrow_forwarddepending on the availability of materials) as shown in the figure here. sheet based on the accuracy of results. III. WHAT I HAVE LEARNED EVALUATION/POST TEST: 1. MULTIPLE CHOICE: Encircle the letter of the correct answer. Show your solution for items that involve problem solving, Write your answers on your notebook/Answer Sheet. 1. A unlform rod of mass 2 kg and length of 2.0 m is pivoted about an axis perpendicular to the rod and 50 cm from its left end. Find the rotational inertia about this axis. d. 0.67 kg m2 a. 2.17 kg m2 2. Which has a greater moment of inertia? a. long fat leg b. 2.57 kg m2 c. 1.17 kg m? b. long thin leg C. short fat leg d. short thin leg 28arrow_forwardThe slider block has the motion shown. Suppose that r = 140 mm and h = 400 mm. (Figure 1) Part A Determine the angular velocity of the wheel at this instant measured counterclockwise. Express your answer using three significant figures. Enter positive value if the angular velocity is counterclockwise and negative value if the angular velocity is clockwise. vec W = rad/s Figure 1 of 1 Submit Request Answer Part B Determine the angular acceleration of the wheel at this instant measured counterclockwise. Express your answer using three significant figures. Enter positive value if the angular acceleration is counterclockwise and negative value if the angular acceleration is clockwise. Πνα ΑΣΦ vec rad/s? vB = 4 m/s ag = 2 m/s² Pearsonarrow_forward
- Compute the torque caused by the load in the diagram below. Is the torque clockwise () counter- clockwise (CCW) ? Compute torques produced by the following forces. Be sure to indicate whether the torque action CW or CCW.arrow_forwardFrom the given beam, determine the moment at point A. The unit for Force is in Newton(N) and Length is in meter(m). F=1,826 M=1,265 P=3,365 Note: 1. Input the numerical value of your final answer in the box provided do not include the unit. 2. Use 2 Decimal Places in your final answer. 3. If your answer is negative, include the negative sign in inputting to the box provided. F 5. 4 A 2 m 3 m 2 m 2 marrow_forwardProblem 4: A string is wrapped around a pulley with a radius of 2.0 cm. The pulley is initially at rest. A constant force of 50 N is applied to the string, causing the pulley to rotate and the string to unwind. If the string unwinds 1.2 m in 4.9 s, what is the moment of inertia of the pulley? Show All Your Work. You Won't Receive Credit If Your Answer Is Not Clearly Justified.arrow_forward
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