Problem 1FTD: Distinguish the Aristotelian and Galilean/New Ionian views of the natural stale of motion. Problem 2FTD: A ball bounces off a wall with the same speed it had before it hit the wall. Has its momentum... Problem 3FTD: We often use the term inertia to describe human sluggishness. How is this usage related to the... Problem 4FTD: Does a body necessarily move in the direction of the net force acting on it? Problem 5FTD: A truck crashes into a stalled car. A student trying to explain the physics of this event claims... Problem 6FTD: A barefoot astronaut kicks a ball, hard, across a space station. Does the balls apparent... Problem 7FTD: The surface gravity on Jupiters moon Io is one-fifth that on Earth. What would happen to your weight... Problem 8FTD: In paddling a canoe, you push water backward with your paddle. What force actually propels the canoe... Problem 9FTD: Is it possible for a nonzero net force to act on an object without the objects speed changing?... Problem 10FTD: As your plane accelerates down the runway, you take your keys from your pocket and suspend them by a... Problem 11FTD: A driver tells passengers to buckle their seatbelts, invoking the law of inertia. Whats that got to... Problem 12FTD: If you cut a spring in half, is the spring constant of each new spring less than, equal to, or... Problem 13FTD: As youre sitting on a chair, theres a gravitational force down-ward on you, and an upward normal... Problem 14E: Section 4.2 Newtons First and Second Laws A subway trains mass is 1.5106 kg. What force is required... Problem 15E: A 61-Mg railroad locomotive can exert a 0.12-MN force. At what rate can it accelerate (a) by itself... Problem 16E: A small plane accelerates down the runway at 7.2 m/s2. If its propeller provides an 11-kN force,... Problem 17E: A car leaves the road traveling at 110 km/h and hits a tree, coming to a stop in 0.14 s. What... Problem 18E: By how much does the force required to stop a car increase if the initial speed is doubled while the... Problem 19E: Kinesin is a motor protein responsible for moving materials within living cells. If it exerts a... Problem 20E: Starting from rest and undergoing constant acceleration, a 940-kg racing car covers 400 m in 4.95 s.... Problem 21E: In an egg-dropping contest, a student encases an 85-g egg in a large Styrofoam block. If the force... Problem 22E: In a front-end collision, a 1300-kg car with shock-absorbing bumpers can withstand a maximum force... Problem 23E: Show that the units of acceleration can be written as N/kg. Why does it make sense to give g as 9.8... Problem 24E: Your spaceship crashes on one of the Suns planets. Fortunately, the ships scales are intact and show... Problem 25E: Your friend can barely lift a 35-kg concrete block on Earth. How massive a block could she lift on... Problem 26E: A cereal box says net weight 340 grams. Whats the actual weight (a) in SI units and (b) in ounces? Problem 27E: Youre a safely engineer for a bridge spanning the U.S.-Canadian border. U.S. specifications permit a... Problem 28E: The gravitational acceleration at the International Space Stations altitude is about 89% of its... Problem 29E: A 50-kg parachutist descends at a steady 40 km/h. What force does air exert on the parachute? Problem 30E: A 930-kg motorboat accelerates away from a dock at 2.3 m/s2. Its propeller provides a 3.9-kN thrust... Problem 31E: An elevator accelerates downward at 2.4 m/s2. What force does the elevators floor exert on a 52-kg... Problem 32E: At 560 metric tons, the Airbus A-380 is the worlds largest air-liner. Whats the upward force on an... Problem 33E: Youre an engineer working on Ares I, NASAs replacement for the space shuttles. Performance specs... Problem 34E: You slop into an elevator, and it accelerates to a downward speed of 9.2 m/s in 2.1 s.... Problem 35E: What upward gravitational force does a 5600-kg elephant exert on Earth? Problem 36E: Your friends mass is 65 kg. If she jumps off a 120-cm-high table, now far does Earth move toward her... Problem 37E: What force is necessary to stretch a spring 48 cm, if its spring constant is 270 N/m? Problem 38E: A 35-N force is applied to a spring with spring constant k = 220 N/m. How much does the spring... Problem 39E: A spring with spring constant k = 340 N/m is used to weigh a 6.7-kg fish. How far does the spring... Problem 40P: A 1.25-kg object is moving in the x-direction at 17.4 m/s. Just 3.41 s later, its moving at 26.8 m/s... Problem 41P: An airplane encounters sudden turbulence, and you feel momentarily lighter. If your apparent weight... Problem 42P: A 74-kg tree surgeon rides a cherry picker lift to reach the upper branches of a tree. What force... Problem 43P: A dancer executes a vertical jump during which the floor pushes up on his feet with a force 50%... Problem 44P: Find expressions for the force needed to bring an object of mass m from rest to speed v (a) in lime... Problem 45P: An elevator moves upward at 5.2 m/s. Whats its minimum stopping time if the passengers are to remain... Problem 46P: A 2.50-kg object is moving along the x-axis at 1.60 m/s. As it passes the origin, two forces F1 and... Problem 47P: Blocks of 1.0, 2.0, and 3.0 kg are lined up on a frictionless table, as shown in Fig. 4.22, with a... Problem 48P: A child pulls an 11-kg wagon with a horizontal handle whose mass is 1.8 kg, accelerating the wagon... Problem 49P: Biophysicists use an arrangement of laser beams called optical tweezers to manipulate microscopic... Problem 50P: A force F is applied to a spring of spring constant k0, stretching it a distance x. Consider the... Problem 51P: A 22(M)-kg airplane pulls two gliders, the first of mass 310 kg and the second of mass 260 kg, down... Problem 52P: A biologist is studying the growth of rats on the Space Station. To determine a rats mass, she puts... Problem 53P: An elastic towrope has spring constant 1300 N/m. Its connected between a truck and a 1900-kg car. As... Problem 54P: A 2.0-kg mass and a 3.0-kg mass are on a horizontal friction-less surface, connected by a massless... Problem 55P: Youre an automotive engineer designing the crumple zone of a new carthe region that compresses as... Problem 56P: Frogs tongues dart out to catch insects, with maximum tongue accelerations of about 250 m/s2. What... Problem 57P: Two large crates, with masses 640 kg and 490 kg, are connected by a stiff, massless spring (k = 8.1... Problem 58P: What force do the blades of a 4300-kg helicopter exert on the air when the helicopter is (a)... Problem 59P: What engine thrust (force) is needed to accelerate a rocket of mass m (a) downward at 1.40g near... Problem 60P: Your engineering firm is asked to specify the maximum load for the elevators in a new building. Each... Problem 61P: With its fuel tanks half full, an F-35A jet fighter has mass 18 Mg and engine thrust 191 kN. An... Problem 62P: Two springs have the same unstretched length but different spring constants, k1 and k2. (a) If... Problem 63P: Although we usually write Newtons second law for one-dimensional motion in the form F = ma, which... Problem 64P: A railroad car is being pulled beneath a grain elevator that dumps grain at the rate of 450 kg/s.... Problem 65P: A block 20% more massive than you hangs from a rope that goes over a frictionless, massless pulley.... Problem 66P: Youre asked to calibrate a device used to measure vertical acceleration in helicopters. The device... Problem 67P: A spider of mass ms drapes a silk thread of negligible mass over a stick with its far end a distance... Problem 68P: Figure 4.27 shows vertical accelerometer data from an iPhone that was dropped onto a pillow. The... Problem 69P: A hockey stick is in contact with a 165-g puck for 22.4 ms; during this time, the force on the puck... Problem 70P: After parachuting through the Martian atmosphere, the Mars Science Laboratory executed a complex... Problem 71P: Your airplane is caught in a brief, violent downdraft. To your amazement, pretzels rise vertically... Problem 72P: Youre assessing the Engineered Material Arresting System (EMAS) at New Yorks JFK airport. The system... Problem 73P: Two masses are joined by a massless string. A 30-N force applied vertically to the upper mass gives... Problem 74P: A mass M hangs from a uniform rope of length L and mass m. Find an expression for the rope tension... Problem 75P: Jerk is the rate of change of acceleration, and its what can make you sick on an amusement park... Problem 76PP: Laptop computers are equipped with accelerometers that sense when the device is dropped and then put... Problem 77PP: Laptop computers are equipped with accelerometers that sense when the device is dropped and then put... Problem 78PP: Laptop computers are equipped with accelerometers that sense when the device is dropped and then put... Problem 79PP: Laptop computers are equipped with accelerometers that sense when the device is dropped and then put... format_list_bulleted