College Physics 1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: Paul Peter Urone, Roger Hinrichs
1 Introduction: The Nature Of Science And Physics 2 Kinematics 3 Two-dimensional Kinematics 4 Dynamics: Force And Newton's Laws Of Motion 5 Further Applications Of Newton's Laws: Friction, Drag, And Elasticity 6 Uniform Circular Motion And Gravitation 7 Work, Energy, And Energy Resources 8 Linear Momentum And Collisions 9 Statics And Torque 10 Rotational Motion And Angular Momentum 11 Fluid Statics 12 Fluid Dynamics And Its Biological And Medical Applications 13 Temperature, Kinetic Theory, And The Gas Laws 14 Heat And Heat Transfer Methods 15 Thermodynamics 16 Oscillatory Motion And Waves 17 Physics Of Hearing 18 Electric Charge And Electric Field 19 Electric Potential And Electric Field 20 Electric Current, Resistance, And Ohm's Law 21 Circuits And Dc Instruments 22 Magnetism 23 Electromagnetic Induction, Ac Circuits, And Electrical Technologies 24 Electromagnetic Waves 25 Geometric Optics 26 Vision And Optical Instruments 27 Wave Optics 28 Special Relativity 29 Introduction To Quantum Physics 30 Atomic Physics 31 Radioactivity And Nuclear Physics 32 Medical Applications Of Nuclear Physics 33 Particle Physics 34 Frontiers Of Physics Chapter4: Dynamics: Force And Newton's Laws Of Motion
Chapter Questions Section: Chapter Questions
Problem 1CQ: Propose a force standard different from the example of a stretched spring discussed in the text.... Problem 2CQ: What properties do forces have that allow us to classify them as vectors? Problem 3CQ: How are inertia and mass related? Problem 4CQ: What is the relationship between weight and mass? Which is an intrinsic, unchanging Property of a... Problem 5CQ: Which statement is correct? (a) Net force causes motion. (b) Net force causes change in motion.... Problem 6CQ: Why can we neglect forces such as those holding a body together when we apply Newton's second law of... Problem 7CQ: Explain how the choice of the “Stem of interest” affects which forces must be considered when... Problem 8CQ: Describe a situation in which the net external force on a system is not zero, yet its speed remains... Problem 9CQ: A system can have a nonzero velocity while the net external force on it is zero. Describe such a... Problem 10CQ: A rock is thrown straight up. What is the net external force acting on the rock when it is at the... Problem 11CQ: (a) Give an example of different net external forces acting on the same system to produce different... Problem 12CQ: If the acceleration of a system is zero, are no external forces acting on it? What about internal... Problem 13CQ: If a constant, nonzero force is applied to an object, what can you say about the velocity and... Problem 14CQ: The gravitational force on the basketball in Figure 4.6 is ignored. When gravity is taken into... Problem 15CQ: When you take off in a jet aircraft, there is a sensation of being pushed back into the seat.... Problem 16CQ: A device used since the 1940s to measure the kick 01 recoil of the body due to heartbeats is the... Problem 17CQ: Describe a Situation in which one a force on and, as a consequence, experiences a force that is... Problem 18CQ: Why does an ordinary rifle recoil (kick backward) when fired? The barrel of a recoilless rifle is... Problem 19CQ: An American football lineman reasons that it is senseless to try to out-push the opposing player,... Problem 20CQ: Newton's third law of motion tells us that forces always occur pars of equal and opposite magnitude.... Problem 21CQ: If a leg is suspended by a traction setup as shown in Figure 4.30, what is the tension in the rope?... Problem 22CQ: Ina traction setup a broken bone, with pulleys and rope available, how might we be able to Increase... Problem 23CQ: To simulate the apparent weightlessness of space orbit, astronauts are trained in the hold of a... Problem 24CQ: A cartoon shows the toupee coming off the head of an elevator passenger when elevator rapidly stops... Problem 25CQ: Explain, in terms of the properties of the four basic forces, why people notice the gravitational... Problem 26CQ: What is the dominant force between astronomical objects? Why are the other three basic forces less... Problem 27CQ: Give a detailed example of the exchange of a particle can result in an attractive force. (For... Problem 1PE: A 63.0-kg sprinter starts a race with an acceleration of 4.20m/s2. What is the net external force on... Problem 2PE: If the sprinter from the previous problem accelerates at that rate for 20 m, and then maintains that... Problem 3PE: A cleaner pushes a 4.50-kg laundry cart in such a way that the net external force on it is 60.0 N.... Problem 4PE: Since astronauts in orbit are apparently weightless, a clever method of measuring their masses is... Problem 5PE: In Figure 4.7, the net external force on the 24-kg mower is stated to be 51 N. If the force of... Problem 6PE: The same rocket sled drawn in Figure 4.31 is decelerated at a rate of 196 m/s2. What force is... Problem 7PE: (a) If the rocket sled shown in Figure 4.32 starts with only one rocket burning, what is the... Problem 8PE: What is the deceleration of the rocket sled if it comes to rest in 1.1 s from a speed of 1000 km/h?... Problem 9PE: Suppose two children push horizontally, but in exactly opposite directions, on a third child in a... Problem 10PE: A powerful motorcycle can produce an acceleration of 3.50 m/s2 while traveling at 90.0 km/h. At that... Problem 11PE: The rocket sled shown in Figure 4.33 accelerates at a rate of 49.0 m/s2. Its passenger has a mass of... Problem 12PE: Repeat the previous problem for the situation in which the rocket sled decelerates at a rate of 201... Problem 13PE: The weight of an astronaut plus his space suit on the Moon is only 250 N. How much do they weigh on... Problem 14PE: Suppose the mass of a fully loaded module in which astronauts take off from the Moon is 10,000 kg.... Problem 15PE: What net external force is exerted on a 1100-kg artillery shell fired from a battleship if the shell... Problem 16PE: A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a... Problem 17PE: Two teams of nine members each engage in a tug of war. Each of the first team's members has an... Problem 18PE: What force does a trampoline have to apply to a 45.0-kg gymnast to accelerate her straight up at... Problem 19PE: (a) Calculate the tension in a vertical strand of spider web if a spider of mass 8.00105 kg hangs... Problem 20PE: Suppose a 60.0-kg gymnast climbs a rope. (a) What is the tension in the rope if he climbs at a... Problem 21PE: Show that, as stated in the text, a force F exerted on a flexible medium at its center and... Problem 22PE: Consider the baby being weighed in Figure 4.34. (a) What is the mass of the child and basket if a... Problem 23PE: A 5.00105 -kg rocket is accelerating straight up. Its engines produce 1.250107 N of thrust, and air... Problem 24PE: The wheels of a midsize car exert a force of 2100 N backward on the road to accelerate the car in... Problem 25PE: Calculate the force a 70.0-kg high jumper must exert on the ground to produce an upward acceleration... Problem 26PE: When landing after a spectacular somersault, a 40.0-kg gymnast decelerates by pushing straight down... Problem 27PE: A freight train consists of two 8.00104 -kg engines and 45 cars with average masses of 5.50104 kg.... Problem 28PE: Commercial airplanes are sometimes pushed out of the passenger loading area by a tractor. (a) An... Problem 29PE: A 1100-kg car pulls a boat on a trailer. (a) What total force resists the motion of the car, boat,... Problem 30PE: (a) Find the magnitudes of the forces F1 and F2 that add to give the total force Ftot shown in... Problem 31PE: Two children pull a third child on a snow saucer sled exerting forces F1 and F2 as shown from above... Problem 32PE: Suppose your car was mired deeply in the mud and you wanted to use the method illustrated in Figure... Problem 33PE: What force is exerted on the tooth in Figure 4.38 if the tension in the wire is 25.0 N? Note that... Problem 34PE: Figure 4.39 shows Superhero and Trusty Sidekick hanging motionless from a rope. Superhero's mass is... Problem 35PE: A nurse pushes a cart by exerting a force on the handle at a downward angle 35.0° below the... Problem 36PE: Construct Your Own Problem Consider the tension in an elevator cable during the time the elevator... Problem 37PE: Construct Your Own Problem Consider people pushing a toboggan with four children on it up a... Problem 38PE: Unreasonable Results (a) Repeat Exercise 4.29, but assume an acceleration of 1.20 m/s2 is produced.... Problem 39PE:
Problem 40PE: A flea jumps by exerting a force of 1.20105 N straight down on the ground. A breeze blowing on the... Problem 41PE: Two muscles in the back of the leg pull upward on the Achilles tendon, as shown in Figure 4.40... Problem 42PE: A 76.0-kg person is being pulled away from a burning building as shown in Figure 4.41. Calculate the... Problem 43PE: Integrated Concepts A 35.0-kg dolphin decelerates from 12.0 to 7.50 m/s in 2.30 s to join another... Problem 44PE: Integrated Concepts When starting a foot race, a 70.0-kg sprinter exerts an average force of 650 N... Problem 45PE: Integrated Concepts A large rocket has a mass of 2.00106 kg at takeoff, and its engines produce a... Problem 46PE: Integrated Concepts A basketball player jumps straight up for a ball. To do this, he lowers his body... Problem 47PE: Integrated Concepts A 2.50-kg fireworks shell is fired straight up from a mortar and reaches a... Problem 48PE: Integrated Concepts Repeat Exercise 4.47 for a shell fired at an angle 10.0° from the vertical. Problem 49PE: Integrated Concepts An elevator filled with passengers has a mass of 1700 kg. (a) The elevator... Problem 50PE: Unreasonable Results (a) What is the final velocity of a car originally traveling at 50.0 km/h that... Problem 51PE: Unreasonable Results A 75.0-kg man stands on a bathroom scale in an elevator that accelerates from... Problem 52PE: (a) What is the strength of the weak nuclear force relative to the strong nuclear force? (b) What is... Problem 53PE: (a) What is the ratio of the strength of the gravitational force to that of the strong nuclear... Problem 54PE: What is the ratio of the strength of the strong nuclear force to that of the electromagnetic force?... Problem 26CQ: What is the dominant force between astronomical objects? Why are the other three basic forces less...
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Concept explainers
A motorcyclist is able to ride on the vertical wall of a bowl shaped track, as shown. Does centripetal force or central fugal force acts on the motorcycle? Defend your answer.
Transcribed Image Text: 25. A motorcyclist is able to ride on the vertical
wall of a bowl-shaped track, as shown. Does
centripetal force or centrifugal force act on
the motorcycle? Defend your answer.
Definition Definition Force on a body along the radial direction. Centripetal force is responsible for the circular motion of a body. The magnitude of centripetal force is given by F C = m v 2 r m = mass of the body in the circular motion v = tangential velocity of the body r = radius of the circular path
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