Physics
3rd Edition
ISBN: 9780073512150
Author: Alan Giambattista, Betty Richardson, Robert C. Richardson Dr.
Publisher: McGraw-Hill Education
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Chapter 4, Problem 1P
To determine
The weight in pounds.
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A uniform ladder of length L and weight w is leaning against a vertical wall. The coefficient of static friction between the ladder and the floor is the same as that between the ladder and the wall. If this
coefficient of static friction is μs : 0.535, determine the smallest angle the ladder can make with the floor without slipping.
°
=
A 14.0 m uniform ladder weighing 480 N rests against a frictionless wall. The ladder makes a 55.0°-angle with the horizontal.
(a) Find the horizontal and vertical forces (in N) the ground exerts on the base of the ladder when an 850-N firefighter has climbed 4.10 m along the ladder from the bottom.
horizontal force
magnitude
342.
N
direction
towards the wall
✓
vertical force
1330
N
up
magnitude
direction
(b) If the ladder is just on the verge of slipping when the firefighter is 9.10 m from the bottom, what is the coefficient of static friction between ladder and ground?
0.26
×
You appear to be using 4.10 m from part (a) for the position of the…
Your neighbor designs automobiles for a living. You are fascinated with her work. She is designing a new automobile and needs to determine how strong the front suspension should be. She knows of
your fascination with her work and your expertise in physics, so she asks you to determine how large the normal force on the front wheels of her design automobile could become under a hard stop,
ma
when the wheels are locked and the automobile is skidding on the road. She gives you the following information. The mass of the automobile is m₂ = 1.10 × 103 kg and it can carry five passengers of
average mass m = 80.0 kg. The front and rear wheels are separated by d = 4.45 m. The center of mass of the car carrying five passengers is dCM = 2.25 m behind the front wheels and
hcm = 0.630 m above the roadway. A typical coefficient of kinetic friction between tires and roadway is μk 0.840. (Caution: The braking automobile is not in an inertial reference frame. Enter the
magnitude of the force in N.)…
John is pushing his daughter Rachel in a wheelbarrow when it is stopped by a brick 8.00 cm high (see the figure below). The handles make an angle of 0 = 17.5° with the ground. Due to the weight of
Rachel and the wheelbarrow, a downward force of 403 N is exerted at the center of the wheel, which has a radius of 16.0 cm. Assume the brick remains fixed and does not slide along the ground. Also
assume the force applied by John is directed exactly toward the center of the wheel. (Choose the positive x-axis to be pointing to the right.)
(a) What force (in N) must John apply along the handles to just start the wheel over the brick?
(No Response) N
(b) What is the force (magnitude in kN and direction in degrees clockwise from the -x-axis) that the brick exerts on the wheel just as the wheel begins to lift over the brick?
magnitude (No Response) KN
direction
(No Response) ° clockwise from the -x-axis
Chapter 4 Solutions
Physics
Ch. 4.1 - CHECKPOINT 4.1A
Identify the forces acting on the...Ch. 4.1 - Prob. 4.1PPCh. 4.1 - Prob. 4.1BCPCh. 4.1 - Prob. 4.2PPCh. 4.2 - Prob. 4.3PPCh. 4.2 - Prob. 4.2CPCh. 4.2 - Prob. 4.4PPCh. 4.4 - Prob. 4.5PPCh. 4.4 - Prob. 4.4CPCh. 4.5 - Practice Problem 4.6 A Creative Defense
After an...
Ch. 4.5 - CHECKPOINT 4.5
If you climb Mt. McKinley, what...Ch. 4.5 - Practice Problem 4.7 Figs on the Moon
What would...Ch. 4.6 - CHECKPOINT 4.6
Your laptop is resting on the...Ch. 4.6 - Practice Problem 4.8 Chest at Rest
Suppose the...Ch. 4.6 - Practice Problem 4.9 Passing a Truck
A car is...Ch. 4.6 - Practice Problem 4.10 Smoothing the Infield...Ch. 4.7 - Practice Problem 4.11 Tightrope Practice
Jorge...Ch. 4.7 - Practice Problem 4.12 System of Ropes, Pulleys,...Ch. 4.8 - Practice Problem 4.13 The Continuing Story …
How...Ch. 4.8 - Practice Problem 4.14 Coupling Force Between First...Ch. 4.8 - Practice Problem 4.15 Another Check
Using the...Ch. 4.8 - Practice Problem 4.16 Hauling the Crate with a...Ch. 4.8 - Practice Problem 4.17 Engine Thrust
What is the...Ch. 4.8 - Prob. 4.18PPCh. 4.8 - Prob. 4.8CPCh. 4.10 - Practice Problem 4.19 Elevator Descending
What is...Ch. 4.10 - Prob. 4.10CPCh. 4 - Prob. 1CQCh. 4 - Prob. 2CQCh. 4 - Prob. 3CQCh. 4 - Prob. 4CQCh. 4 - Prob. 5CQCh. 4 - Prob. 6CQCh. 4 - Prob. 7CQCh. 4 - Prob. 8CQCh. 4 - Prob. 9CQCh. 4 - Prob. 10CQCh. 4 - Prob. 11CQCh. 4 - Prob. 12CQCh. 4 - Prob. 13CQCh. 4 - Prob. 14CQCh. 4 - 15. A heavy ball hangs from a string attached to a...Ch. 4 - 16. An SUV collides with a Mini Cooper...Ch. 4 - Prob. 17CQCh. 4 - Prob. 18CQCh. 4 - Prob. 19CQCh. 4 - Prob. 20CQCh. 4 - Prob. 21CQCh. 4 - Prob. 22CQCh. 4 - Prob. 23CQCh. 4 - 24. Pulleys and inclined planes are examples of...Ch. 4 - Prob. 25CQCh. 4 - Prob. 26CQCh. 4 - Prob. 27CQCh. 4 - Prob. 28CQCh. 4 - Prob. 29CQCh. 4 - Prob. 30CQCh. 4 - Prob. 31CQCh. 4 - Prob. 32CQCh. 4 - Prob. 1MCQCh. 4 - Prob. 2MCQCh. 4 - Prob. 3MCQCh. 4 - Prob. 4MCQCh. 4 - Prob. 5MCQCh. 4 - Prob. 6MCQCh. 4 - Prob. 7MCQCh. 4 - Prob. 8MCQCh. 4 - Prob. 9MCQCh. 4 - Prob. 10MCQCh. 4 - Prob. 11MCQCh. 4 - Prob. 12MCQCh. 4 - Prob. 13MCQCh. 4 - Prob. 14MCQCh. 4 - Prob. 15MCQCh. 4 - Prob. 16MCQCh. 4 - Prob. 17MCQCh. 4 - Prob. 18MCQCh. 4 - Prob. 19MCQCh. 4 - Prob. 20MCQCh. 4 - Prob. 21MCQCh. 4 - Prob. 22MCQCh. 4 - Prob. 23MCQCh. 4 - Prob. 24MCQCh. 4 - Prob. 25MCQCh. 4 - Prob. 26MCQCh. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - 16. A truck driving on a level highway is acted on...Ch. 4 - 17. A tennis ball (mass 57.0 g) moves toward the...Ch. 4 - 18. A red-tailed hawk that weighs 8 N is gliding...Ch. 4 - 19. An 80 N crate of apples sits at rest on the...Ch. 4 - 20. Forces of magnitudes 2000 N and 3000 N act on...Ch. 4 - 21. A person stands on the ball of one foot. The...Ch. 4 - 22. A sailboat, tied to a mooring with a line,...Ch. 4 - 23. A hummingbird is hovering motionless beside a...Ch. 4 - 24. You are pulling a suitcase through the airport...Ch. 4 - Prob. 25PCh. 4 - 26. A man is lazily floating on an air mattress in...Ch. 4 - 27. What is the acceleration of an automobile of...Ch. 4 - 28. A bag of potatoes with weight 39.2 N is...Ch. 4 - 29. A large wooden crate is pushed along a...Ch. 4 - 30. A hanging plant is suspended by a cord from a...Ch. 4 - 31. A bike is hanging from a hook in a garage....Ch. 4 - 32. A woman who weighs 600 N sits on a chair with...Ch. 4 - 33. A fisherman is holding a fishing rod with a...Ch. 4 - 34. In Problem 33, identify the forces acting on...Ch. 4 - Problems 35–37. A skydiver, who weighs 650 N, is...Ch. 4 - 36. (a) Identify the forces acting on the...Ch. 4 - 37. Consider the skydiver and parachute to be a...Ch. 4 - 38. Margie, who weighs 543 N, is standing on a...Ch. 4 - 39. (a) Calculate your weight in newtons. (b) What...Ch. 4 - 40. A young South African girl has a mass of 40.0...Ch. 4 - 41. A man weighs 0.80 kN on Earth. What is his...Ch. 4 - 42. The peak force on a runner’s foot during a...Ch. 4 - 43. In a binary star system, two stars orbit their...Ch. 4 - 44. An astronaut stands at a position on the Moon...Ch. 4 - 45. Find the ratio of the Earth’s gravitational...Ch. 4 - 46. How far above the surface of the Earth does an...Ch. 4 - 47. Find and compare the weight of a 65 kg man on...Ch. 4 - 48. Find the altitudes above the Earth’s surface...Ch. 4 - 49. During a balloon ascension, wearing an oxygen...Ch. 4 - 50. At what altitude above the Earth’s surface...Ch. 4 - 51. (a) What is the magnitude of the gravitational...Ch. 4 - 52. What is the approximate magnitude of the...Ch. 4 - 53. In free fall, we assume the acceleration to be...Ch. 4 - 54. A solar sailplane is going from Earth to Mars....Ch. 4 - Problems 55–57. Assume the elevator is supported...Ch. 4 - 56. While an elevator of mass 2530 kg moves...Ch. 4 - 57. While an elevator of mass 832 kg moves...Ch. 4 - 58. The vertical component of the acceleration of...Ch. 4 - 59. A man lifts a 2.0 kg stone vertically with his...Ch. 4 - 60. A man lifts a 2.0 kg stone vertically with his...Ch. 4 - Prob. 61PCh. 4 - 62. A binary star consists of two stars of masses...Ch. 4 - 63. Mechanical advantage is the ratio of the force...Ch. 4 - 64. A book rests on the surface of the table....Ch. 4 - 65. A crate of artichokes is on a ramp that is...Ch. 4 - Prob. 66PCh. 4 - 67. An 85 kg skier is sliding down a ski slope at...Ch. 4 - 68. A book that weighs 10 N is at rest in six...Ch. 4 - 69. Strategy While the crate is remaining at rest,...Ch. 4 - Problems 69–72. A crate of potatoes of mass 18.0...Ch. 4 - Problems 69–72. A crate of potatoes of mass 18.0...Ch. 4 - Problems 69–72. A crate of potatoes of mass 18.0...Ch. 4 - 73. (a) In Example 4.10, if the movers stop...Ch. 4 - 74. A 3.0 kg block is at rest on a horizontal...Ch. 4 - 75. A horse is trotting along pulling a sleigh...Ch. 4 - 76. Before hanging new William Morris wallpaper in...Ch. 4 - 77. A conveyor belt carries apples up an incline...Ch. 4 - 78. A box sits on a horizontal wooden ramp. The...Ch. 4 - 79. In a playground, two slides have different...Ch. 4 - 80. A sailboat is tied to a mooring with a...Ch. 4 - 81. A towline is attached between a car and a...Ch. 4 - 82. In Example 4.14, find the tension in the...Ch. 4 - 83. A 200.0 N sign is suspended from a horizontal...Ch. 4 - 84. Strategy Use Newton’s first law of motion. The...Ch. 4 - 85. A pulley is attached to the ceiling. Spring...Ch. 4 - 86. Spring scale A is attached to the floor and a...Ch. 4 - 87. Two springs are connected in series so that...Ch. 4 - 88. A pulley is hung from the ceiling by a rope. A...Ch. 4 - 89. A 2.0 kg ball tied to a string fixed to the...Ch. 4 - Prob. 90PCh. 4 - 91. A 45 N lithograph is supported by two wires....Ch. 4 - 92. A crow perches on a clothesline midway between...Ch. 4 - 93. The drawing shows a wire attached to two back...Ch. 4 - 94. A cord cut into two equal sections, with a...Ch. 4 - 95. Two blocks, masses m1 and m2, are connected by...Ch. 4 - 96. The coefficient of static friction between a...Ch. 4 - 97. A 2.0 kg toy locomotive is pulling a 1.0 kg...Ch. 4 - 98. An engine pulls a train of 20 freight cars,...Ch. 4 - Prob. 99PCh. 4 - 100. A rope is attached from a truck to a 1400 kg...Ch. 4 - 101. An accelerometer—a device to measure...Ch. 4 - 102. A box full of books rests on a wooden floor....Ch. 4 - 103. A helicopter is lifting two crates...Ch. 4 - 104. A person stands on a bathroom scale in an...Ch. 4 - 105. Oliver has a mass of 76.2 kg. He is riding in...Ch. 4 - Prob. 106PCh. 4 - Prob. 107PCh. 4 - Prob. 108PCh. 4 - Prob. 109PCh. 4 - 110. Yolanda, whose mass is 64.2 kg, is riding in...Ch. 4 - Prob. 111PCh. 4 - Prob. 112PCh. 4 - Prob. 113PCh. 4 - Prob. 114PCh. 4 - Prob. 115PCh. 4 - Prob. 116PCh. 4 - Prob. 117PCh. 4 - Prob. 118PCh. 4 - Prob. 119PCh. 4 - Prob. 120PCh. 4 - Prob. 121PCh. 4 - Prob. 122PCh. 4 - Prob. 123PCh. 4 - Prob. 124PCh. 4 - Prob. 125PCh. 4 - Prob. 126PCh. 4 - Prob. 127PCh. 4 - Prob. 128PCh. 4 - Prob. 129PCh. 4 - Prob. 130PCh. 4 - Prob. 131PCh. 4 - Prob. 132PCh. 4 - Prob. 133PCh. 4 - 134. The tallest spot on Earth is Mt. Everest,...Ch. 4 - Prob. 135PCh. 4 - Prob. 136PCh. 4 - Prob. 137PCh. 4 - Prob. 138PCh. 4 - Prob. 139PCh. 4 - Prob. 140PCh. 4 - Prob. 141PCh. 4 - Prob. 142PCh. 4 - Prob. 143PCh. 4 - Prob. 144PCh. 4 - Prob. 145PCh. 4 - Prob. 146PCh. 4 - Prob. 147PCh. 4 - Prob. 148PCh. 4 - Prob. 149PCh. 4 - Prob. 150PCh. 4 - Prob. 151PCh. 4 - Prob. 152PCh. 4 - Prob. 153PCh. 4 - Prob. 154PCh. 4 - 155. You want to lift a heavy box with a mass of...Ch. 4 - 156. A crate of oranges weighing 180 N rests on a...Ch. 4 - Prob. 157PCh. 4 - Prob. 158PCh. 4 - 159. A helicopter of mass M is lowering a truck of...Ch. 4 - Prob. 160PCh. 4 - Prob. 161PCh. 4 - Prob. 162PCh. 4 - Prob. 163PCh. 4 - 164. A person is doing leg lifts with 3.00 kg...Ch. 4 - Prob. 165PCh. 4 - Prob. 166PCh. 4 - Prob. 167PCh. 4 - Prob. 168PCh. 4 - Prob. 169PCh. 4 - Prob. 170PCh. 4 - Prob. 171PCh. 4 - Prob. 172PCh. 4 - Prob. 173PCh. 4 - Prob. 174PCh. 4 - Prob. 175PCh. 4 - Prob. 176PCh. 4 - Prob. 177PCh. 4 - Prob. 178PCh. 4 - Prob. 179P
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