PHYS 212 FOR SCI+ENG W/MAST PHYS >ICP<
1st Edition
ISBN: 9781323834831
Author: Knight
Publisher: PEARSON C
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Chapter 9, Problem 12CQ
12. The left end of a spring is attached to a wall. When Bob pulls on the right end with a 200 N Force, he stretches the spring by 20 cm. The same spring is then used for a tug-of-war between Bob and Carlos. Each pulls on his end of the spring with a 200 N force. How far does the spring stretch? Explain.
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A typical mattress has a network of springs that provide support. If you sit on a mattress, the springs compress. A heavier person compresses the springs more than a lighter person. Use the properties of springs and spring forces to explain why.
*10. Go Review Conceptual Example 2 as an
aid in solving this problem. An object is at-
tached to the lower end of a 100-coil spring
that is hanging from the ceiling. The spring
stretches by 0.160 m. The spring is then cut
into two identical springs of 50 coils each. As
the drawing shows, each spring is attached
between the ceiling and the object. By how
much does each spring stretch?
50-coil
spring
10
Chapter 9 Solutions
PHYS 212 FOR SCI+ENG W/MAST PHYS >ICP<
Ch. 9 - If a particle’s speed increases by a factor of 3,...Ch. 9 - Prob. 2CQCh. 9 - 3. An elevator held by a single cable is ascending...Ch. 9 - The rope in FIGURE Q9.4 pulls the box to the left...Ch. 9 - 5. A 0.2 kg plastic cart and a 20 kg lead cart...Ch. 9 - A particle moving to the left is slowed by a force...Ch. 9 - 7. A particle moves in a vertical plane along the...Ch. 9 - 8. You need to raise a heavy block by pulling it...Ch. 9 - 9. A ball on a string travels once around a circle...Ch. 9 - A sprinter accelerates from rest. Is the work done...
Ch. 9 - 11. A Spring has an unstretched length of 10cm. It...Ch. 9 - 12. The left end of a spring is attached to a...Ch. 9 - The driver of a car traveling at 60 mph slams on...Ch. 9 - Prob. 14CQCh. 9 - Which has the larger kinetic energy, a 10 g bullet...Ch. 9 - At what speed does a 1000 kg compact car have the...Ch. 9 - 3. A mother has four times the mass of her young...Ch. 9 - 4. A horizontal rope with 15 N tension drags a 25...Ch. 9 - 5. A 25 kg box sliding to the left across a...Ch. 9 - A 2.0 kg book is lying on a 0.75-m-high table. You...Ch. 9 - Prob. 7EAPCh. 9 - Prob. 8EAPCh. 9 - 9. You throw a 5.5 g coin straight down at 4.0 m/s...Ch. 9 - Prob. 10EAPCh. 9 - 12. Evaluate the dot product if
and .
and .
Ch. 9 - 12. Evaluate the dot product if
and .
and .
Ch. 9 - 13. What is the angle ? between vectors and in...Ch. 9 - Prob. 14EAPCh. 9 - Prob. 15EAPCh. 9 - 16. A 25 kg air compressor is dragged up a rough...Ch. 9 - Prob. 17EAPCh. 9 - The two ropes seen in FIGURE EX9.18 are used to...Ch. 9 - 19. The three ropes shown in the bird’s-eye view...Ch. 9 - Prob. 20EAPCh. 9 - Prob. 21EAPCh. 9 - Prob. 22EAPCh. 9 - A particle moving on the x-axis experiences a...Ch. 9 - Prob. 24EAPCh. 9 - A horizontal spring with spring constant 750 N/m...Ch. 9 - 26. A 35-cm-long vertical spring has one end fixed...Ch. 9 - A 10-cm-long spring is attached to the ceiling....Ch. 9 - A 60 kg student is standing atop a spring in an...Ch. 9 -
29. A 5.0 kg mass hanging from a spring scale is...Ch. 9 - A horizontal spring with spring constant 85 N/m...Ch. 9 - 31. One mole (6.02 × 1023 atoms) of helium atoms...Ch. 9 - 32. A 55 kg softball player slides into second...Ch. 9 - A baggage handler throws a 15 kg suitcase along...Ch. 9 -
34. An 8.0 kg crate is pulled 5.0 m up a 30°...Ch. 9 - Justin, with a mass of 30 kg, is going down an...Ch. 9 - Prob. 36EAPCh. 9 - Prob. 37EAPCh. 9 - 38. How much energy is consumed by (a) a 1.2 kW...Ch. 9 - 39. At midday, solar energy strikes the earth with...Ch. 9 - Prob. 40EAPCh. 9 - Prob. 41EAPCh. 9 - Prob. 42EAPCh. 9 - 43. A 1000 kg elevator accelerates upward at 1.0...Ch. 9 - 44. a. Starting from rest, a crate of mass m is...Ch. 9 - Prob. 45EAPCh. 9 - 46. A particle of mass m moving along the x-axis...Ch. 9 -
47. A ball shot straight up with kinetic energy...Ch. 9 - 48. A pile driver lifts a 250 kg weight and then...Ch. 9 - Prob. 49EAPCh. 9 -
50. You’re fishing from a tall pier and have...Ch. 9 - Hook’s law describes an ideal spring. Many real...Ch. 9 -
52. The force acting on a particle is Fx =...Ch. 9 - 53. The gravitational attraction between two...Ch. 9 -
54. An electric dipole consists of two equal...Ch. 9 - Prob. 55EAPCh. 9 -
56. When a 65 kg cheerleader stands on a...Ch. 9 - Prob. 57EAPCh. 9 - Prob. 58EAPCh. 9 -
59. A horizontal spring with spring constant 250...Ch. 9 - 60. A 90 kg firefighter needs to climb the stairs...Ch. 9 - Prob. 61EAPCh. 9 - 62. When you ride a bicycle at constant speed,...Ch. 9 -
63. A farmer uses a tractor to pull a 150 kg...Ch. 9 - Prob. 64EAPCh. 9 - Prob. 65EAPCh. 9 - Prob. 66EAPCh. 9 - In problems 67 through 69 you are given the...Ch. 9 - Prob. 68EAPCh. 9 - Prob. 69EAPCh. 9 - Prob. 70EAPCh. 9 - Prob. 71EAPCh. 9 - Prob. 72EAP
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- 13. Three students have a discussion about a lab activity they completed in class regarding hanging a mass from a spring. Student A: "If I want the spring to stretch twice as far I would use a spring with twice the spring constant, since I will get twice the force for the same mass.' Student B: "If I want the spring to stretch twice as far I would use a spring with half the spring constant. That spring would need to stretch twice as far to be in equilibrium with the weight of the mass." Student C: "If I want the spring to stretch twice as far, I have to double the weight hanging from it. Changing the spring constant has no effect on how much the spring stretches." a) With which student, if any, do you agree? b) Carefully explain your reasoning.arrow_forward2. An un-stretched spring has a length of 0.50 m and a spring constant of 100. N/m. What force is required to stretch this spring to a length of 0.60 m?arrow_forward3. When a 200 g mass is connected to the bottom of the spring, it stretches 1 cm.Which value is closest to the spring constant?arrow_forward
- A.20 m long spring is attached to the wall. When pulled horizontally with a force of 100 N, the spring stretches to a length of .30 m. -.20 m .30 m 100 N a) Calculate the value of the spring constant.arrow_forward- 11. A 0.37 kg ball is suspended from a vertical spring with spring constant of 100.0 N/m. What is the downward stretch of the spring? Ax= ? omarrow_forward1. One end of a helical spring is fixed and the other end is subjected to five different tensile forces. The lengths of the spring measured at various values of the tensile forces are given below: Tensile force F (N) 100 250 330 480 570 Total length of the spring (mm) 150 163 183 194 214 226 Determine the force-deflection relation of the helical spring and create the graph.arrow_forward
- 4. Explain how an astronaut in an orbiting satellite can use a spring with a known force constant to measure his mass. Normally he could hang motionless from the spring to stretch it and, thus, determine his weight mg from the force constant and the amount of stretch. By dividing his weight by g, he could determine his mass. This method will not work, however, since his apparent weight is zero.arrow_forwardSF-1 A coil spring has an unloaded total length of 25.0cm. The spring constant is 1.20N/cm. The left end of the spring is attached to a rigid support (can't move). a) Draw the spring on your paper at its unloaded length. b) Below your first drawing, draw the spring with a length L-35.0cm and show the force F needed to hold the spring at this length. Calculate the magnitude of F. c) Below your second drawing, draw the spring with a length L-25.0cm and show the force F needed to hold the spring at this length. Calculate the magnitude of F. 25.0cmarrow_forward8. A delivery person in an elevator is holding a package by an elastic cord. a. What happens to the length of the cord when the elevator accelerates upward? Draw the FBD for the package. b. What happens to the cord length when the elevator slows to a stop after its ascent? Draw the FBD.arrow_forward
- Q1:- While delivering newspapers, a girl throws a newspaper with a horizontal velocity Vo ft/sec. Determine the range of values of u, if the newspaper is to land between points B and C. 14 in. 36 in. - A Vo 4 ft 8 in. 8 in. 8 in. 7 ftarrow_forward2. A 50 kg Cylinder is hanging by the cables from the ceiling. Determine the magnitude of tensions in cables AB, AC and AD. You must solve this problem using statics method. Assume the value of g is 9.80. (-2,0,-2) m (-3,0,3) m (4, 0, 1 ) m A(0.-4, 0) mn 50 kgarrow_forwardTwo masses M, and M, are attached to different springs as shown in the adjacent figure. The upper spring has spring constant k, and extension X,. Also, the lower spring has spring constant k, and extension X,. If the two springs are of negligible masses and the adjacent setup is at static equilibrium, then X, is given by: A. M1g/k1 B. (M,+M2)g/k2 C. M2g/k2 D. (M,+M2)g/k1 E. (M,+M2)g/(ki+ k2) K1, X1 M1 K2, X2 M2arrow_forward
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