Problem 1CQ: A clothesline always sags a little, even if nothing hangs from it. Explain. Problem 2CQ: In the Jurassic Park sequel, The Lost World, a man tries to keep a large vehicle from going over a... Problem 3CQ: When a traffic accident is investigated, it is common for the length of the skid marks to be... Problem 4CQ: In a car with rear-wheel drive, the maximum acceleration is often less than the maximum... Problem 5CQ: A train typically requires a much greater distance to come to rest, for a given initial speed, than... Problem 6CQ: Give some everyday examples of situations in which friction is beneficial. Problem 7CQ: At the local farm, you buy a flat of strawberries and place them on the backseat of the car. On the... Problem 8CQ: It is possible to spin a bucket of water in a vertical circle and have none of the water spill when... Problem 9CQ: Water sprays off a rapidly turning bicycle wheel. Why? Problem 10CQ: Can an object be in translational equilibrium if it is moving? Explain Problem 11CQ Problem 12CQ: The gravitational attraction of the Earth is only slightly less at the altitude of an orbiting... Problem 13CQ: A popular carnival ride has passengers stand with their backs against the inside wall of a cylinder.... Problem 14CQ: Referring to Question 13, after the cylinder reaches operating speed, the floor is lowered away,... Problem 15CQ: Your car is stuck on an icy side street. Some students on their way to class see your predicament... Problem 16CQ: The parking brake on a car causes the rear wheels to lock up. What would be the likely consequence... Problem 17CQ: BIO The foot of your average gecko is covered with billions of tiny hair tipscalled spatulaethat are... Problem 18CQ: Discuss the physics involved in the spin cycle of a washing machine. In particular, how is circular... Problem 19CQ: The gas pedal and the brake pedal are capable of causing a car to accelerate. Can the steering wheel... Problem 20CQ: In the movie 2001: A Space Odyssey, a rotating space station provides "artificial gravity" for its... Problem 21CQ: When rounding a corner on a bicycle or a motorcycle, the driver leans inward, toward the center of... Problem 1PCE: Predict/Explain You push two identical bricks across a tabletop with constant speed, U, as shown in... Problem 2PCE: Predict/Explain Two drivers traveling side-by-side at the same speed suddenly see a deer in the road... Problem 3PCE: A 1.8-kg block slides on a horizontal surface with a speed of v = 0.80 m/s and an acceleration of... Problem 4PCE: A child goes down a playground slide with an acceleration of 1.26m/s2. Find the coefficient of... Problem 5PCE: What is the minimum horizontal force F needed to make the box start moving in Figure 6-? The... Problem 6PCE: What is the minimum horizontal force F needed to make the box start moving in Figure 6-? The... Problem 7PCE: The three identical boxes shown in Figure 6-33 remain at rest on a rough, horizontal surface, even... Problem 8PCE: To move a large crate across a rough floor, you push on it with a force F at an angle of 21 below... Problem 9PCE: Predict/Calculate A 37-kg crate is placed on an inclined ramp. When the angle the ramp makes with... Problem 10PCE: Coffee To Go A person places a cup of coffee on the roof of his car while he dashes back into the... Problem 11PCE: A mug rests on an inclined surface, as shown in Figure 6-35. (a) What is the magnitude of the... Problem 12PCE: Predict/Calculate Force Times Distance At the local hockey rink, a puck with a mass of 0.12 kg is... Problem 13PCE Problem 14PCE: A certain spring has a force constant k. (a) If this spring is cut in half, does the resulting half... Problem 15PCE: A certain spring has a force constant k. (a) If two such identical springs are connected in parallel... Problem 16PCE: Pulling up on a rope you lift a 7.27-kg bucket of water from a well with an acceleration of 1.24... Problem 17PCE: When a 9.09-kg mass is placed on top of a vertical spring, the spring compresses 4.18 cm. Find the... Problem 18PCE: Predict/Calculate A backpack full of books weighing 52.0 N rests on a table in a physics laboratory... Problem 19PCE: Two springs, with force constants k1= 150N/m and k2 = 250N/m, are connected in series, as shown in... Problem 20PCE: Predict/Calculate Illinois Jones is being pulled from a snake pit with a rope that breaks if the... Problem 21PCE: Predict/Calculate A spring with a force constant of 120 N/m is used to push a 0.27-kg block of wood... Problem 22PCE: A spring is suspended vertically from the ceiling of a room. When a mass is attached to the bottom... Problem 23PCE: Mechanical Advantage The pulley system shown in Figure 6-41 is used to lift a m = 67 kg crate. Note... Problem 24PCE: Pulling the string on a bow back with a force of 28.7 lb, an archer prepares to shoot an arrow. If... Problem 25PCE: In Figure 6-42 we see two blocks connected by a string and tied to a wall. The mass of the lower... Problem 26PCE: BIO Traction After a skiing accident, your leg is in a cast and supported in a traction device, as... Problem 27PCE: Two blocks are connected by a string, as shown in Figure 6-44.The smooth inclined surface makes an... Problem 28PCE: Predict/Calculate The system shown in Figure 6-45 consists of two pulleys and two blocks. The... Problem 29PCE: Predict/Explain (a) Referring to the hanging planter in Example 6-10, which of the three graphs (A,... Problem 30PCE: BIO Spiderweb Forces An orb-weaver spider sits in her web that is supported by three radial strands... Problem 31PCE: A 0.15-kg ball is placed in a shallow wedge with an opening angle of 120, as shown in Figure 6-48.... Problem 32PCE: Predict/Calculate A picture hangs on the wall suspended by two strings, as shown in Figure 6-49.The... Problem 33PCE: Predict/Calculate You want to nail a 1.6-kg board onto the wall of a barn. To position the board... Problem 34PCE Problem 35PCE: In Example 6-13 (Connected Blocks), suppose m1 and m2 are both increased by a factor of 2. (a) Does... Problem 36PCE: Predict/Explain Suppose m1 and m2 in Example 6-14 (Atwoods Machine) are both increased by 1 kg. Does... Problem 37PCE: Three boxes of masses m, 2m, and 3m are connected as shown in Figure 6-52. A force is applied to... Problem 38PCE: Find the acceleration of the masses shown in Figure 6-53, given that m1 = 1.0kg, m2 = 2.0kg, and m3... Problem 39PCE: Predict/Calculate (a) If the hanging mass m3 in Figure 6-53 is decreased, will the acceleration of... Problem 40PCE: Two blocks are connected by a string, as shown in Figure 6-54. The smooth inclined surface makes an... Problem 41PCE: Predict/Calculate A 3 50-kg block on a smooth tabletop is attached by a string to a hanging block of... Problem 42PCE: Predict/Calculate A 7.7-N force pulls horizontally on a 1.6-kg block that slides on a smooth... Problem 43PCE: Predict/Calculate (a) Find the magnitude of the acceleration of the two blocks in Figure 6 (a)... Problem 44PCE: A car drives with constant speed on an elliptical track, as shown in Figure 6-57. | Rank the points... Problem 45PCE: A puck attached to a string undergoes circular motion on an air table. If the string breaks at the... Problem 46PCE: BIO Bubble Net Fishing Humpback whales sometimes catch fish by swimming rapidly in a circle, blowing... Problem 47PCE: When you take your 1900-kg car out for a spin, you go around a corner of radius 53 m with a speed of... Problem 48PCE: BIO A Human Centrifuge To test the effects of high acceleration on the human body, the National... Problem 49PCE: A car goes around a curve on a road that is banked at an angle of 21.5. Even though the road is... Problem 50PCE: Clearview Screen Large ships often have circular structures in their windshields, as shown in Figure... Problem 51PCE: Predict/Calculate (a) As you ride on a Ferris wheel, your apparent weight is different at the top... Problem 52PCE: Driving in your car with a constant speed of v = 22m/s, you encounter a bump in the road that has a... Problem 53GP: CE If you weigh yourself on a bathroom scale at the equator, is the reading you get greater than... Problem 54GP: CE BIO Maneuvering a Jet Humans lose consciousness if exposed to prolonged accelerations of more... Problem 55GP: CE BIO Gravitropism As plants grow, they tend to align their stems and roots along the direction of... Problem 56GP: BIO Human-Powered Centrifuge One of the hazards of prolonged weightlessness on long space missions... Problem 57GP: Predict/Calculate A 9 3-kg box slides across the floor of an elevator with a coefficient of kinetic... Problem 58GP: A child goes down a playground slide that is inclined at an angle of 26 5 below the horizontal. Find... Problem 59GP: Spin-Dry Dragonflies Some dragonflies splash down onto the surface of a lake to clean themselves.... Problem 60GP: The da Vinci Code Leonardo da Vinci (1452-1519) is credited with being the first to perform... Problem 61GP: A 4 5-kg sled is pulled with constant speed across a rough, horizontal surface with various amounts... Problem 62GP: A 0 045-kg golf ball hangs by a string from the rearview mirror of a car, as shown in Figure 6-63.... Problem 63GP: A physics textbook weighing 22 N rests on a desk. The coefficient of static friction between the... Problem 64GP: Predict/Calculate The blocks shown in Figure 6-64 are at rest. (a) Find the frictional force exerted... Problem 65GP: A Conical Pendulum A 0 075-kg toy airplane is tied to the ceiling with a string. When the airplanes... Problem 66GP: A tugboat tows a barge at constant speed with a 3500-kg cable, as shown in Figure 6-66. If the angle... Problem 67GP: Predict/Calculate Two blocks, stacked one on top of the other, can move without friction on the... Problem 68GP: Predict/Calculate In a daring rescue by helicopter two men with a combined mass of 172 kg are lifted... Problem 69GP: Predict/Calculate A light spring with a fore constant of 13 N/m is connected to a wall and to a... Problem 70GP: Predict/Calculate The blocks in Figure 6-69 have an acceleration of magnitude a = 1.1 m/s2. (a) Is... Problem 71GP: Predict/Calculate Playing a Violin The tension in a violin string is 2.7 N. When pushed down against... Problem 72GP: Predict/Calculate A 9 8-kg monkey hangs from a rope as shown in Figure 6-70. The tension on the left... Problem 73GP: As your plane circles an airport, it moves in a horizontal circle of radius 2300 m with a speed of... Problem 74GP: At a playground, a 22-kg child sits on a spinning merry-go-round as shown from above in Figure 6-71.... Problem 75GP: A 2.0-kg box rests on a plank that is inclined at an angle of 65 above the horizontal. The upper end... Problem 76GP: A wood block of mass m rests on a larger wood block of mass M that rests on a wooden table. The... Problem 77GP: A hockey puck of mass m is attached to a string that passes through a hole in the center of a table,... Problem 78GP: Predict/Calculate A popular ride at amusement parks is illustrated in Figure 6-74. In this ride,... Problem 79GP: A Conveyor Belt A box is placed on a conveyor belt that moves with a constant speed of 1.25 m/s. The... Problem 80GP: As part of a circus act, a person drives a motorcycle with constant speed u around the inside of a... Problem 81PP: On the straight-line segment II in Figure 6-76 (b) we see that increasing the applied mass from 20 g... Problem 82PP: 82. Rank the straight segments I, II, and III in order of increasing stiffness of the nasal strips Problem 83PP: In use on a typical human nose, the end-to-end distance is measured to be 30 mm. What force does the... Problem 84PP: Predict/Calculate Referring to Example 6-3 Suppose the coefficients of static and kinetic friction... Problem 85PP: Predict/Calculate Referring to Example 6-3 The crate begins to slide when the tilt angle is 17.5.... Problem 86PP: Referring to Example 6-13 Suppose that the mass on the frictionless tabletop has the value m1 = 2.45... Problem 87PP: Referring to Example 6-15 (a) At what speed will the force of static friction exerted on the car by... format_list_bulleted