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,... format_list_bulleted