Part A A force of 36.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor. What is the coefficient of static friction between the box and the floor? Express your answer using two significant figures. Hs = 0.61 Submit Previous Answers v Correct Part B If the 36.0-N force continues, the box accelerates at 0.58 m/s. What is the coefficient of kinetic friction? Express your answer using two significant figures. ? Hk =

Part A A force of 36.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor. What is the coefficient of static friction between the box and the floor? Express your answer using two significant figures. Hs = 0.61 Submit Previous Answers v Correct Part B If the 36.0-N force continues, the box accelerates at 0.58 m/s. What is the coefficient of kinetic friction? Express your answer using two significant figures. ? Hk =

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section: Chapter Questions

Problem 71A

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(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise, it is possible to exert forces to the joints that are easily 10 times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pam.
Consider the baby being weighed in the following figure. (a) What is the mass of the infant and basket if a scale reading of 55 N is observed? (b) What is tension T1in the cord attaching the baby to the scale? (c) What is tension T2, In the cord attaching the scale to the ceiling, If the scale has a mass of 0.500 kg? (d) Sketch the situation, indicating the system of interest used to solve each part. The masses of the cords are negligible.
To maintain a constant speed, the force provided by a car’s engine must equal the drag force plus the force of friction of the road (the rolling resistance). (a) What are the drag forces at 70 km/h and 100 km/h for a Toyota Camry? (Drag area is 0.70m2 ) (b) What is the drag force at 70 km/h and 100 km/h for a Hummer H2? (Drag area is 2.44m2 ) Assume all values are accurate to three significant digits.
esmat.h... Figure Lobby | Top Hat A uniform board of length L and mass M lies near a boundary that separates two regions. In region 1, the coefficient of kinetic friction between the board and the surface is μ, and in region 2, the coefficient is 2. The positive direction is shown in the figure. (Figure 1) Before: region 1 After: 141 Aktiv Chemistry FI 1₂ D2L Homepage - Vande... M Gmail 12 1 of 1 > region 2 4 Part A W = Submit Handshake VYES - Vanderbilt - S... Find the net work W done by friction in pulling the board directly from region 1 to region 2. Assume that the board me constant velocity. Express the net work in terms of M, g, L, ₁, and μ2. ►View Available Hint(s) IVE ΑΣΦ Part B Complete previous part(s) Provide Feedback Course Home P Pearson ? Review | Co Copyright ©2022 Pearson Education Inc. All rights reserved | Terms of Use | Privacy Policy Pormin ▬▬▬▬
Consider the figure shown in the following figure. You are loweringtwo boxes, one on top of the other, down a ramp by pulling on a ropeparallel to the surface of the ramp. Both blocks move with constantvelocity of 10.0 [m/s]. The coefficient of kinetic friction between theramp and the lower box is 0.555 and the coefficient of static frictionbetween the two boxes is 0.750. A. Draw the Free-Body diagram of both blocks. Set the ?-axis parallel to the ramp. B. Write Newton’s 2nd law along the ? and ? directions for both blocks considering their state of motion (accelerations). C. What are the magnitude and direction of the frictional force on the upper box? D. What is the magnitude of the applied force? E. Determine the angle at which the top block will start to slide down the bottom block.
Consider the figure shown in the following figure. You are loweringtwo boxes, one on top of the other, down a ramp by pulling on a ropeparallel to the surface of the ramp. Both blocks move with constantvelocity of 10.0 [m/s]. The coefficient of kinetic friction between theramp and the lower box is 0.555 and the coefficient of static frictionbetween the two boxes is 0.750. A. Draw the Free-Body diagram of both blocks. Set the ?-axis parallel to the ramp. B. Write Newton’s 2nd law along the ? and ? directions for both blocks considering their state ofmotion (accelerations). C. What are the magnitude and direction of the frictional force on the upper box? D. What is the magnitude of the applied force? E. Determine the angle at which the top block will start to slide down the bottom block.
Santa Clause is about to distribute his gifts, but his reindeer Rudolph is still sleepy. So, instead of flying they use the ground and cross a 20-m-long bridge. Starting from rest, Rudolph pulls Santa and his sleigh, with a force F 30° above the horizontal against a frictional force of 80N. 1. Draw an appropriate free body diagram to represent all the forces acting on Santa and his sleigh. 2. Suppose the combined mass of Santa, his sleigh, and his gifts is 500kg. What is the magnitude of Fif the acceleration of Santa and his sleigh is 1.5 meters per second squared? 3. How much work is done by Rudolph in pulling Santa and his sleigh in crossing the bridge? 4. What is the change in the kinetic energy of Santa and his sleigh after crossing the bridge? 5. How fast are they moving at the end of the bridge?
I Review I Constants A box of bananas weighing 40.0 N rests on a horizontal surface. The coefficient static friction Part C between the box and the surface is 0.40 and the coefficient of kinetic friction is 0.20. What minimum horizontal force must the monkey apply to start the box in motion? Express your answer in newtons. ΑΣφ ? Fmin N %3D Submit Request Answer Part D What minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has been started? Express your answer in newtons. Πνα ΑΣφ F = N %3D
IP Two blocks, stacked one on top of the other, can move without friction on the horizontal surface shown in the figure.(Figure 1) The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.44. Part A If a horizontal force F is applied to the 5.0-kg bottom block, what is the maximum value F can have before the 2.0-kg top block begins to slip? Express your answer using two significant figures. Πν ΑΣφ. F = N Submit Request Answer Part B If the mass of the top block increased, does the maximum value of F increase, decrease, or stay the same? O increases O decreases O stays the same Submit Request Answer Provide Feedback Figure 2.0 kg F 5.0 kg
A sled is on a horizontal surface and a rope with tension T is pulling on it at an angle 0 above the horizontal. The sled had mass M and does not move due to the frictional force. In this case the coefficient of friction is µ̟. In terms of the variables given and g, what is the magnitude of the frictional force in this case? Select one: a. H, Mgsino b. Tcose O c. Tsin0 O d. H, Mgcos0
A friction experiment is performed on a planet that has the same mass as Earth but half the radius. A 1.0-kg block is pulled along a horizontal dynamics track with a horizontal force of magnitude 15.0 N. If the coefficient of kinetic friction between the block and the track is 0.3, determine the acceleration of the block. O a. 14.26 m/s^2 O b. 12.06 m/s^2 O. 3.24 m/s^2 Od. 15.00 m/s^2
To prevent the ladder weighing 600N from sliding down, the man exerts a horizontal force at C. The coefficient of friction at A= 0.2 while surface B is frictionless Find the vertical reaction at Aa. 600N c. 500Nb. 700N d. 800NFind the horizon reaction at Aa. 150N c. 210Nb. 180N d. 120NFind the horizon force exerted by the man at Ca. 533.3N c. 333.3Nb. 667.7N d. 767.6N