Problem 1RQ: Review Question 3.1 How do we determine how many forces to draw on a force diagram?
Problem 2RQ: Review Question 3.2 A book bag hanging from a spring scale is partially supported by a platform... Problem 3RQ: Review Question 3.3 An elevator in a tall office building moves downward at constant speed. How does... Problem 4RQ: Review Question 3.4 What is the main difference between inertial and noninertial reference frames?... Problem 5RQ: Review Question 3.5 Your friend says that m is a force exerted on an object and it should be... Problem 6RQ: Review Question 3.6 Newton’s second law says that the acceleration of an object is inversely... Problem 7RQ: Review Question 3.7 Three friends argue about the type of information a bathroom scale reports:... Problem 8RQ: Review Question 3.8 Is the following sentence true? When you hold a heavy object in your hands, you... Problem 9RQ: Review Question 3.9 Explain how an air bag and seat belt reduce the force exerted on the driver of a... Problem 1MCQ: An upward-moving elevator slows to a stop as it approaches the top floor. Which answer below best... Problem 2MCQ: You apply the brakes of your car abruptly and your book starts sliding off the front seat. Three... Problem 3MCQ: Which of the statements below explains why a child lurches forward in a stroller when you abruptly... Problem 4MCQ: Which observers can explain the phenomenon of whiplash, which occurs when a car stops abruptly,... Problem 5MCQ: 5. Which vector quantities describing a moving object are always in the same direction?
a. Velocity... Problem 6MCQ: You have probably observed that magnets attract objects made of certain metals, such as steel... Problem 7MCQ: Which of the following velocity-versus-time graphs represent the motion of the object for which ... Problem 8MCQ: A book sits on a tabletop. What force is the Newtons third law pair to the force that Earth exerts... Problem 9MCQ: 9. A spaceship moves in outer space. What happens to its motion if there are no external forces... Problem 10MCQ: 10. A 0.10-kg apple falls on Earth, whose mass is about kg. Which is true of the gravitational force... Problem 11MCQ: 11. A man stands on a scale and holds a heavy object in his hands. What happens to the scale reading... Problem 12MCQ: You stand on a bathroom scale in a moving elevator. What happens to the scale reading if the cable... Problem 13MCQ: A person pushes a 10-kg crate, exerting a 200-N force on it, but the crates acceleration is only 5... Problem 14MCQ: Two small balls of the same material, one of mass m and the other of mass 2m, are dropped... Problem 15MCQ: 15. A box full of lead and a box of the same size full of feathers are floating inside a spaceship... Problem 16MCQ:
16. Figure Q3.16 shows an unlabeled force diagram for a moving object that is missing one force.... Problem 17MCQ: A person jumps from a wall and lands stiff-legged. Which statement best explains why the person is... Problem 18MCQ: A 3000-kg spaceship is moving away from a space station at a constant speed of 3 m/s. The astronaut... Problem 19CQ: Figure Q3.19 is a velocity-versus-time graph for the vertical motion of an object. Choose the... Problem 20CQ: 20. Explain the purpose of crumple zones, that is, the front of a car that collapses during a... Problem 21CQ: 21. Explain why when landing on a firm surface after a fall you should not land with stiff legs.
Problem 22CQ: A small car bumps into a large truck. Compare the forces that the truck exerts on the car and the... Problem 23CQ: 23. You are pulling a sled. Compare the forces that you exert on the sled and the sled exerts on you... Problem 25CQ: 25. You are holding a 100-g apple. (a) What is the force that you exert on the apple? (b) What is... Problem 26CQ: 26. You throw a 100-g apple upward. (a) While the apple is still in your hand (we'll call this... Problem 27CQ: After having been thrown upward, a 100-g apple falls back into your hand and you catch it. (a) While... Problem 1P: * In Figure P3.1 you see unlabeled force diagrams for balls in different situations. Match the... Problem 2P: 2. Draw a force diagram (a) for a bag hanging at rest from a spring; (b) for the same bag sitting on... Problem 3P: 3. For each of the following situations, draw the forces exerted on the moving object and identify... Problem 4P: 4. You hang a book bag on a spring scale and place the bag on a platform scale so that the platform... Problem 5P: 5. A block of dry ice slides at constant velocity along a smooth, horizontal surface. (a) Construct... Problem 6P: 6. * You throw a ball upward. (a) Draw a motion diagram and two force diagrams for the ball on its... Problem 7P: 7. A string pulls horizontally on a cart so that it moves at increasing speed along a smooth... Problem 8P: 8. * Solving the previous problem, your friend says that after the string stops pulling, the cart... Problem 9P: 9. * A string pulls horizontally on a cart so that it moves at increasing speed along a smooth... Problem 10P: A block of dry ice slides at a constant velocity on a smooth horizontal surface. A second block of... Problem 11P: 11 .Three motion diagrams for a moving elevator are shown in Figure P3.11 . Construct two force... Problem 12P: 12. * A student holds a thin aluminum pie pan horizontally 2 m above the ground and releases it... Problem 13P: * Figures P3.11a b, and c show three motion diagrams for an elevator moving downward. (a) For each... Problem 14P: 14. * A train traveling from New York to Philadelphia is passing a station. A ball is sitting on the... Problem 15P: *Explain the phenomenon of whiplash from two points of view: that of an observer on the ground and... Problem 16P: An astronaut exerts a 100-N force pushing a beam into place on the International Space Station The... Problem 17P: 17. Four people participate in a rope competition. Two of them pull the rope right, exerting forces... Problem 18P: 18. * Shot put throw During a practice shot put throw, the 7.0-kg shot left world champion C. J.... Problem 19P: * You know the sum of the forces F exerted on an object of mass m during t seconds. The object is... Problem 20P: * You record the displacement of an object as a constant force is exerted on it. (a) If the time... Problem 25P: 25. * Spider-Man Spider-Man holds the bottom of an elevator with one hand. With his other hand, he... Problem 26P: ** Matt is wearing Rollerblades. Beth pushes him along a hallway with a large spring, keeping the... Problem 27P: 27. * Stuntwoman The downward acceleration of a 60-kg stuntwoman near the end of a fall from a very... Problem 28P: EST Estimate the average force that a baseball pitchers hand exerts on a 0.145-kg baseball as he... Problem 29P: * Super Hornet jet takeoff A2.1104-kgF-18 Super Hornet jet airplane (see Figure P3.29) goes from... Problem 30P: Lunar Lander The Lunar Lander of mass 2.01024 kg made the last 150 m of its trip to the Moons... Problem 31P: 31. Aisha throws a ball upward Frances, standing on a balcony above Aisha, catches the ball by... Problem 32P: Students Lucia. Isabel, and Austin are investigating how snow stops a dropped 500-g lemon juice... Problem 33P: 33. * Astronaut Karen Nyberg, a 60-kg astronaut, sits on a bathroom scale in a rocket that is taking... Problem 34P: * A 0.10-kg apple falls off a tree branch that is 2.0 m above the grass. The apple sinks 0.060 m... Problem 35P: 35. ** An 80-kg fireman slides 5.0 m down a fire pole. He holds the pole, which exerts a 500-N... Problem 36P: * Earth exerts a 1.0-N gravitational force on an apple as it falls toward the ground. (a) What force... Problem 37P: * You push a bowling ball down the lane toward the pins. Draw force diagrams for the ball (a) just... Problem 38P: 38. * EST (a) A 50-kg skater initially at rest throws a 4-kg medicine ball horizontally. Describe... Problem 39P: 39. ** EST Basketball player LeBron James can jump vertically over 0.9 m. Estimate the force that he... Problem 40P: * EST The Scottish Tug of War Association contests involve eight-person teams pulling on a rope in... Problem 41P: Consider the experiment described in Question 3.6 (Figure Q3.6 ). (a) Draw force diagrams for the... Problem 42P: 42. * EST A friend drops a 0.625-kg basketball from 2 m above you. (a) Estimate the smallest force... Problem 43P: 43 Car safety The National Transportation Safety Board indicates that a person in a car crash has a... Problem 44P: 44. * A 70-kg person in a moving car stops during a car collision in a distance of 0.60 m. The... Problem 45GP: BIOESTLeft ventricle pumpingThe lower left chamber of the heart (the left ventricle) pumps blood... Problem 46GP Problem 47GP: 47. ** EST Olympic dive During a practice dive, Olympic diver Fu Mingxia reached a maximum height of... Problem 49GP: 49. ** EST You are doing squats on a bathroom scale. You decide to push off the scale and jump up.... Problem 50GP: ** EST Estimate the horizontal speed of the runner shown In Figure P3.50 at the instant she leaves... Problem 51GP: 51. ** EST Estimate the maximum acceleration of Earth if all people got together and jumped up... Problem 52GP: ** EST Estimate how much Earth would move during the jump described in Problem 51. Problem 53RPP: In an early practice run while the rocket sled was stopping, a passenger dummy broke its restraining... Problem 54RPP: What is Stapps67m/sspeed in miles per hour? 30mi/h 40mi/h 100mi/h 120mi/h 150mi/h Problem 55RPP: 55. What is the magnitude of the acceleration of Stapp and his sled as their speed increased from... Problem 56RPP: 56. What is the magnitude of the acceleration of Stapp and his sled as their speed decreased... Problem 57RPP: What is the average force exerted by the restraining system on 80-kg Stapp while his speed decreased... Problem 58RPP: 58. What is the time interval for Stapp and his sled to stop as their speed decreased from 67 m/s to... Problem 59RPP: Using proportions A proportion is defined as an equality between two ratios; for instance, a/b=c/d.... Problem 60RPP: Using proportions A proportion is defined as an equality between two ratios; for instance, a/b =... Problem 61RPP: Using proportions A proportion is defined as an equality between two ratios; for instance, a/b =... Problem 62RPP: Using proportions A proportion is defined as an equality between two ratios; for instance, a/b =... Problem 63RPP: Using proportions A proportion is defined as an equality between two ratios; for instance, a/b =... format_list_bulleted