Concept explainers
A student wrote: “The only reason an apple falls downward to meet the earth instead of the earth rising upward to meet the apple is that the earth is much more massive and so exerts a much greater pull.” Please comment.
Validation of the given statement
Explanation of Solution
Newton’s Third Law states that for every action, there is an equal and opposite reaction.
The gravitational force exerted on an apple by the earth will be equal in magnitude and opposite in direction as the gravitational force exerted on the earth by the apple.
As
Conclusion: The reason that apple falls downward to meet the earth instead of the earth rising upward to meet the apple is that the earth is much more massive and so exerts a much greater pull.
Want to see more full solutions like this?
Chapter 13 Solutions
University Physics with Modern Physics (14th Edition)
Additional Science Textbook Solutions
University Physics (14th Edition)
The Cosmic Perspective Fundamentals (2nd Edition)
College Physics
University Physics Volume 2
Modern Physics
Essential University Physics: Volume 1 (3rd Edition)
- Review. The first stage of a Saturn V space vehicle consumed fuel and oxidizer at the rate of 150 104 kg/s with an exhaust speed of 2.60 101 m/s. (a) Calculate the thrust produced by this engine. (b) Find the acceleration the vehicle had just as it lifted off the launch pad on the Earth, taking the vehicles initial mass as 3.00 106 kg.arrow_forwardWhen the angle is big, the dumbbell will go straight forward(the direction is opposite to the force), however, if the angle is small enough,the dumbbell will go backward. Why?arrow_forwardA person steps horizontally off the roof of a single-story house that is 3.1 m high. When his feet hit theground below, he bends his knees such that his torso decelerates over a distance of 0.65 m before coming to astop. If the mass of his torso is 50 kg, what is the average net force exerted on his torso over this distance?arrow_forward
- A passenger is standing on a scale in an elevator. The building has a height of 500 feet, the passenger has a mass of 80 kg, and the scale has a mass of 7 kg. The scale sits on the floor of the elevator. (It is an Otis elevator, so we will label it as "O" so as not to confuse its forces with those caused by the earth.) You may take g = 10 N/kg. For doing this problem it might be useful to start by drawing free-body diagrams for the passenger and the scale. Consider the vertical forces acting on the passenger and the scale WE→P: The force of the earth pulling down on the passenger (weight). WE→S: The force of the earth pulling down on the scale (weight). NP→S: The force of the passenger pushing down on the scale (normal). NS→P: The force of the scale pushing up on the passenger (normal). NO→S: The force of the elevator pushing up on the scale (normal). NO→P: The force of the elevator pushing up on the passenger (normal). Which of these forces affect the motion of the passenger? Select…arrow_forwardMultiple-choice question: As shown in the figure, both the vertical wall and the fixed slope are smooth, then the magnitude of the force acting on the slope by a ball with mass marrow_forwardChristian is making a Tyrolean traverse as shown in the figure. That is, he traverses a chasm by stringing a rope between a tree on one side of the chasm and a tree on the opposite side, 25 m away. The rope must sag sufficiently so it won't break. Assume the rope can provide a tension force of up to 26 kN before breaking, and use a "safety factor" of 10 (that is, the rope should only be required to undergo a tension force of 2.6 kN) at the center of the Tyrolean traverse. Figure 1 of 1 > Part A Determine the distance that the rope must sag if it is to be within its recommended safety range and Christian's mass is 72.0 kg Express your answer using two significant figures. x= Submit Part B T= VG| ΑΣΦ Submit Request Answer If the Tyrolean traverse is incorrectly set up so that the rope sags by only one-fourth the distance found in part A, determine the tension force in the rope. (Figure 1) Express your answer using two significant figures. —| ΑΣΦ ? Request Answer m ? Narrow_forward
- A person starts from rest at the top of a large frictionless spherical surface, and slides into the water below (see the drawing). At what angle does the person leave the surface? (Hint: When the person leaves the surface, the normal force is zero.) Number Units 8arrow_forwardA passenger is standing on a scale in an elevator. The building has a height of 500 feet, the passenger has a mass of 80 kg, and the scale has a mass of 7 kg. The scale sits on the floor of the elevator. (It is an Otis elevator, so we will label it as "O" so as not to confuse its forces with those caused by the earth.) You may take g = 10 N/kg. For doing this problem it might be useful to start by drawing free-body diagrams for the passenger and the scale. a) The elevator now begins to descend. Starting from rest, it takes the elevator 6 seconds to get up to its downward speed of 12 m/s. Assuming that it is accelerating downward at a uniform rate during these 6 seconds, what is the acceleration? b) While it is accelerating downward, what does the scale read (in newtons)?arrow_forwardA 80.0 kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a position 2.4 m sideways from its original position, always keeping the rope taut.arrow_forward
- In the illustration below, the beam is 12 meters long and weighs 20 N (positioned at its center of mass right in the middle). Find the reading on weighing scale 2. 2 m 100 kg Weighing Scale 1 Weighing Scale 2 Weight of the beam: 20 N Length of the beam: 12 m 208 N 320 N O 32 N O 20.8 N O None of the choices given. O O O OOarrow_forwardDetermine the magnitude of the y-component of the reaction force at pin A (in kN). The beam AB is a standard 0.5 m I-beam with a mass of 95 kg per meter of length. 14 l A 0.25 m 0.5 m 0.12 m 5 m 25° 1.5 m 10 kN Barrow_forwardA skier (of mass 55 kg) skies down the smooth (friction less) ski slope illustrated in the cross-sectional diagram: She pushes off at the top with a speed of 10m/s. At the bottom (0m), she comes to a stop by digging her skis in sideways. (c) Substitute all known values of constants and variables, and identify any unknown(s).arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Classical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning