College Physics 11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Raymond A. Serway, Chris Vuille
1 Units, Trigonometry. And Vectors 2 Motion In One Dimension 3 Motion In Two Dimensions 4 Newton's Laws Of Motion 5 Energy 6 Momentum, Impulse, And Collisions 7 Rotational Motion And Gravitation 8 Rotational Equilibrium And Dynamics 9 Fluids And Solids 10 Thermal Physics 11 Energy In Thermal Processes 12 The Laws Of Thermodynamics 13 Vibrations And Waves 14 Sound 15 Electric Forces And Fields 16 Electrical Energy And Capacitance 17 Current And Resistance 18 Direct-Current Circuits 19 Magnetism 20 Induced Voltages And Inductance 21 Alternating-Current Circuits And Electromagnetic Waves 22 Reflection And Refraction Of Light 23 Mirrors And Lenses 24 Wave Optics 25 Optical Instruments 26 Relativity 27 Quantum Physics 28 Atomic Physics 29 Nuclear Physics 30 Nuclear Energy And Elementary Particles Chapter4: Newton's Laws Of Motion
4.1 Forces 4.2 The Laws Of Motion 4.3 The Normal And Kinetic Friction Forces 4.4 Static Friction Forces 4.5 Tension Forces 4.6 Applications Of Newton's Laws 4.7 Two-Body Problems Chapter Questions Section: Chapter Questions
Problem 1CQ: A passenger sitting in the rear of a bus claims that she was injured as the driver slammed on the... Problem 2CQ: A space explorer is moving through space far from any planet or star. He notices a large rock, taken... Problem 3CQ: (a) If gold were sold by weight, would you rather buy it in Denver or in Death Valley? (b) If it... Problem 4CQ: If you push on a heavy box that is at rest, you must exert some force to start its motion. Once the... Problem 5CQ: A ball is held in a persons hand. (a) Identify all the external forces acting on the ball and the... Problem 6CQ: A weight lifter stands on a bathroom scale. (a) As she pumps a barbell up and down, what happens to... Problem 7CQ: (a) What force causes an automobile to move? (b) A propeller-driven airplane? (c) A rowboat? Problem 8CQ: If only one force acts on an object, can it be in equilibrium? Explain. Problem 9CQ: In the: motion picture It Happened One Night (Columbia Pictures, 1934), Clark Gable is standing... Problem 10CQ: Analyze the motion of a rock dropped in water in terms of its speed and acceleration as it falls.... Problem 11CQ: Identify the action-reaction pairs in the following situations: (a) a man takes a step, (b) a... Problem 12CQ: Draw a free-body diagram for each of the following objects: (a) a projectile in motion in the... Problem 13CQ: In a tug-of-war between two athletes, each pulls on the rope with a force of 200 N. What is the... Problem 14CQ: Suppose you are driving a car at a high speed. Why should you avoid slamming on your brakes when you... Problem 15CQ: As a block slides down a frictionless incline, which of the following statements is true? (a) Both... Problem 16CQ: A crate remains stationary after it has been placed on a ramp inclined at an angle with the... Problem 17CQ: In Figure 4.4, a locomotive has broken through the wall of a train station. During the collision,... Problem 18CQ: If an object is in equilibrium, which of the following statements is not true? (a) The speed of the... Problem 19CQ: A truck loaded with sand accelerates along a highway. The driving force on the truck remains... Problem 20CQ: A large crate of mass m is placed on the back of a truck but not tied down. As the truck accelerates... Problem 21CQ: Which of the following statements are true? (a) An astronauts weight is the same on the Moon as on... Problem 22CQ: A woman is standing on the Earth. In terms of magnitude, is her gravitational force on the Earth (a)... Problem 23CQ: An exoplanet has twice the mass and half the radius of the Earth. Find the acceleration due to... Problem 24CQ: Choose the best answer. A car traveling at constant speed has a net force of zero acting on it. (a)... Problem 1P: The heaviest invertebrate is the giant squid, which is estimated to have a weight of about 2 tons... Problem 2P: A football punter accelerates a football from rest to a speed of 10 m/s during the time in which his... Problem 3P: A 6.0-kg object undergoes an acceleration of 2.0 m/s2. (a) What is the magnitude of the resultant... Problem 4P: One or more external forces are exerted on each object enclosed in a dashed box shown in Figure 4.2.... Problem 5P: A bag of sugar weighs 5.00 lb on Earth. What would it weigh in newtons on the Moon, where the... Problem 6P: A freight train has a mass of 1.5 107 kg. If the locomotive can exert a constant pull of 7.5 105... Problem 7P: Four forces act on an object, given by A = 40.0 N east, B = 50.0 north, C = 70.0 N west, and D =... Problem 8P: Consider a solid metal sphere (S) a few centimeters in diameter and a feather (F). For each quantity... Problem 9P: As a fish jumps vertically out of the water, assume that only two significant forces act on it: an... Problem 10P: A 5.0-g bullet leaves the muzzle of a rifle with a speed of 320 m/s. What force (assumed constant)... Problem 11P: A boat moves through the water with two forces acting on it. One is a 2.00 103-N forward push by... Problem 12P: Two forces are applied to a car in an effort to move it, as shown in Figure P4.12. (a) What is the... Problem 13P: A 970.-kg car starts from rest on a horizontal roadway and accelerates eastward for 5.00 s when it... Problem 14P: An object of mass m is dropped from the roof of a building of height h. While the object is falling,... Problem 15P: After falling from rest from a height of 30.0 m, a 0.500-kg ball rebounds upward, reaching a height... Problem 16P: The force exerted by the wind on the sails of a sailboat is 390 N north. The water exerts a force of... Problem 17P: A force of 30.0 N is applied in the positive x-direction to a block of mass 8.00 kg, at rest on a... Problem 18P: What would be the acceleration of gravity at the surface of a world with twice Earths mass and twice... Problem 19P: Calculate the magnitude of the normal force on a 15.0-kg block in the following circumstances: (a)... Problem 20P: A horizontal force of 95.0 N is applied to a 60.0-kg crate on a rough, level surface. If the crate... Problem 21P: A car of mass 875 kg is traveling 30.0 m/s when the driver applies the brakes, which lock the... Problem 22P: A student of mass 60.0 kg, starting at rest, slides down a slide 20.0 m long, tilted at an angle of... Problem 23P: A 1.00 103-N crate is being pushed across a level floor at a constant speed by a force F of 3.00 ... Problem 24P: A block of mass m = 5.8 kg is pulled up a = 25 incline as in Figure P4.24 with a force of magnitude... Problem 25P: A rocket takes off from Earths surface, accelerating straight up at 72.0 m/s2. Calculate the normal... Problem 26P: A man exerts a horizontal force of 125 N on a crate with a mass of 30.0 kg. (a) If the crate doesnt... Problem 27P: A horse is harnessed to a sled having a mass of 236 kg, including supplies. The horse must exert a... Problem 28P: A block of mass 55.0 kg rests on a slope having an angle of elevation of 25.0. If pushing downhill... Problem 29P: A dockworker loading crates on a ship finds that a 20.0-kg crate, initially at rest on a horizontal... Problem 30P: Suppose the coefficient of static friction between a quarter and the back wall of a rocket car is... Problem 31P: The coefficient of static friction between the 3.00-kg crate and the 35.0 incline of Figure P4.31 is... Problem 32P: Two identical strings making an angle of = 30.0 with respect to the vertical support a block of... Problem 33P: A 75-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 825... Problem 34P: A crate of mass m = 32 kg rides on the bed of a truck attached by a cord to the back of the cab as... Problem 35P: (a) Find the tension in each cable supporting the 6.00 102-N cat burglar in Figure P4.35. (b)... Problem 36P: The distance between two telephone poles is 50.0 m. When a 1.00-kg bird lands on the telephone wire... Problem 37P: (a) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in... Problem 38P: A certain orthodontist uses a wire brace to align a patients crooked tooth as in Figure P4.88. The... Problem 39P: A 150-N bird feeder is supported by three cables as shown in Figure P4.39. Find the tension in each... Problem 40P: The leg and cast in Figure P4.40 weigh 220 N (w1). Determine the weight w2 and the angle needed so... Problem 41P: A 276-kg glider is being pulled by a 1 950-kg jet along a horizontal runway with an acceleration of... Problem 42P: A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The coefficient of... Problem 43P: Consider a large truck carrying a heavy load, such as steel beams. A significant hazard for the... Problem 44P: A student decides to move a box of books into her dormitory room by pulling on a rope attached to... Problem 45P: An object falling under the pull of gravity is acted upon by a frictional force of air resistance.... Problem 46P: A 3.00-kg block starts from rest at the top of a 30.0 incline and slides 2.00 m down the incline in... Problem 47P: To meet a U.S. Postal Service requirement, employees footwear must have a coefficient of static... Problem 48P: A block of mass 12.0 kg is sliding at an initial velocity of 8.00 m/s in the positive x-direction.... Problem 49P: The person in Figure P4.49 weighs 170. lb. Each crutch makes an angle of 22.0 with the vertical (as... Problem 50P: A car is traveling at 50.0 km/h on a flat highway. (a) If the coefficient of friction between road... Problem 51P: A 5.0-kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket... Problem 52P: A hockey puck struck by a hockey stick is given an initial speed v0 in the positive x-direction. The... Problem 53P: A setup similar to the one shown in Figure P4.53 is often used in hospitals to support and apply a... Problem 54P: An Atwoods machine (Fig. 4.38) consists of two masses: one of mass 3.00 kg and the other of mass... Problem 55P: A block of mass m1 = 16.0 kg is on a frictionless table to the left of a second block of mass m2 =... Problem 56P: Two blocks each of mass m are fastened to the top of an elevator as in Figure P4.56. The elevator... Problem 57P: Two blocks of masses m and 2m are held in equilibrium on a frictionless incline as in Figure P4.57.... Problem 58P: The systems shown in Figure P4.58 are in equilibrium. If the spring scales are calibrated in... Problem 59P: Assume the three blocks portrayed in Figure P4.59 move on a frictionless surface and a 42-N force... Problem 60P: Two packing crates of masses 10.0 kg and 5.00 kg are connected by a light string that passes over a... Problem 61P: A 1.00 103 car is pulling a 300.-kg trailer. Together, the car and trailer have an acceleration of... Problem 62P: Two blocks of masses m1 and m2 (m1 m2) are placed on a frictionless table in contact with each... Problem 63P: In Figure P4.63, the light, taut, unstretchable cord B joins block 1 and the larger-mass block 2.... Problem 64P: An object with mass m1 = 5.00 kg rests on a frictionless horizontal table and is connected to a... Problem 65P: Objects with masses m1 = 10.0 kg and m2 = 5.00 kg are connected by a light string that passes over a... Problem 66P: Two objects with masses of 3.00 kg and 5.00 kg are connected by a light string that passes over a... Problem 67P: In Figure P4.64, m1 = 10. kg and m2 = 4.0 kg. The coefficient of static friction between m1 and the... Problem 68P: A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is... Problem 69P: A 15.0-lb block rests on a horizontal floor, (a) What force does the floor exert on the block? (b) A... Problem 70P: Objects of masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a light string dial passes over a... Problem 71P: Two blocks each of mass m = 3.50 kg are fastened to the top of an elevator as in Figure P4.56. (a)... Problem 72AP: As a protest against the umpires calls, a baseball pitcher throws a ball straight up into the air at... Problem 73AP: Three objects are connected on a table as shown in Figure P4.73. The coefficient of kinetic friction... Problem 74AP: (a) What is the minimum force of friction required to hold the system of Figure P4.74 in... Problem 75AP: (a) What is the resultant force exerted by the two cables supporting the traffic light in Figure... Problem 76AP: A woman at an airport is towing her 20.0-kg suitcase at constant speed by pulling on a strap at an... Problem 77AP: A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.00 m/s.... Problem 78AP: Three objects are connected by light strings as shown in Figure P4.78. The string connecting the... Problem 79AP: A box rests on the back of a truck. The coefficient of static friction between the box and the bed... Problem 80AP: A high diver of mass 70.0 kg steps off a board 10.0 m above the water and falls vertical to the... Problem 81AP: A frictionless plane is 10.0 m long and inclined at 35.0. A sled starts at the bottom with an... Problem 82AP: Measuring coefficients of friction A coin is placed near one edge of a book lying on a table, and... Problem 83AP: A 2.00-kg aluminum block and a 6.00-kg copper block are connected by a light string over a... Problem 84AP: On an airplanes takeoff, the combined action of the air around the engines and wings of an airplane... Problem 85AP: Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in Figure... Problem 86AP: A sled weighing 60.0 N is pulled horizontally across snow so that the coefficient of kinetic... Problem 87AP: A car accelerates down a hill (Fig. P4.87), going from rest to 30.0 m/s in 6.00 s. During the... Problem 88AP: An inventive child wants to reach an apple in a tree without climbing the tree. Sitting in a chair... Problem 89AP: The parachute on a race car of weight 8 820 N opens at the end of a quarter-mile run when the car is... Problem 90AP: A fire helicopter carries a 620-kg bucket of water at the end of a 20.0-m-long cable. Flying back... Problem 91AP: The board sandwiched between two other boards in Figure P4.91 weighs 95.5 N. If the coefficient of... Problem 92AP: A 72-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends,... Problem 74AP: (a) What is the minimum force of friction required to hold the system of Figure P4.74 in...
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Concept explainers
A 4.00 kg block sits on a table top with a coefficient of static friction of 0.470 and a coefficient of kinetic friction of 0.320. A weight is attached by a string to the block so as to just overcome the force of static friction acting on the block. What is the acceleration of the block?
Transcribed Image Text: A 4.00 kg block sits on a table top with a coefficient of static friction of 0.470 and a
coefficient of kinetic friction of 0.320. A weight is attached by a string to the block
so as to just overcome the force of static friction acting on the block. What is the
acceleration of the block?
4.00 kg
pulley
2.67 m/s2
O 1.02 m/s?
3.58 m/s2
O 1.47 m/s?
Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.
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