Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 4, Problem 13FTD
As you’re sitting on a chair, there’s a gravitational force down-ward on you, and an upward normal force from the chair on you. Do these forces constitute a third-law pair? If not, what forces are paired with each of these?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Consider the Washington Monument in Washington, D.C. in the United States. What forces act between it and the Earth and how do they compare?
a) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with a force equal to the Earth’s weight acting in the same direction.
b) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with a force equal to the Earth’s weight in the opposite direction.
c) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with an equal force in the same direction.
d) The monument is attracted to the Earth with a force equal to its weight, and the Earth is attracted to the monument with an equal force in the opposition direction.
A box of mass m=4.00 kg is pressed against the ceiling of a room by an upward vertical force F-> =66.0ȷ^ N as shown in the figure. Assume that the magnitude of gravitational acceleration is g-> =10.0ȷ^ m/s2. Determine the normal force N-> that the roof exerts on the box. (In the alternatives below, consider j =ȷ^).
Options are shown bellow:
EuFORCEia! Cassie is sitting on a frictionless playground slide that makes an angle 0 with
the horizontal. Maddy, who is on the top of the slide, is holding Cassie's belt parallel to the
slide. If Cassie weighs 55.0 [kg) and feels a normal force of 403 [N], what should the tension
be to prevent Cassie from sliding? Set the direction down the slide as the positive direction.
O 359 [N]
O 346 [N]
O 326 [N]
O 339 [N]
Chapter 4 Solutions
Essential University Physics (3rd Edition)
Ch. 4.2 - A curved barrier lies on a horizontal tabletop, as...Ch. 4.2 - A nonzero net force acts on an object. Which of...Ch. 4.4 - A popular childrens book explains the...Ch. 4.5 - For each of the following situations, would the...Ch. 4.6 - The figure shows two blocks with two forces acting...Ch. 4.6 - (1) Would the answer to (a) in Example 4.5 change...Ch. 4 - Distinguish the Aristotelian and Galilean/New...Ch. 4 - A ball bounces off a wall with the same speed it...Ch. 4 - We often use the term inertia to describe human...Ch. 4 - Does a body necessarily move in the direction of...
Ch. 4 - A truck crashes into a stalled car. A student...Ch. 4 - A barefoot astronaut kicks a ball, hard, across a...Ch. 4 - The surface gravity on Jupiters moon Io is...Ch. 4 - In paddling a canoe, you push water backward with...Ch. 4 - Is it possible for a nonzero net force to act on...Ch. 4 - As your plane accelerates down the runway, you...Ch. 4 - A driver tells passengers to buckle their...Ch. 4 - If you cut a spring in half, is the spring...Ch. 4 - As youre sitting on a chair, theres a...Ch. 4 - Section 4.2 Newtons First and Second Laws A subway...Ch. 4 - A 61-Mg railroad locomotive can exert a 0.12-MN...Ch. 4 - A small plane accelerates down the runway at 7.2...Ch. 4 - A car leaves the road traveling at 110 km/h and...Ch. 4 - By how much does the force required to stop a car...Ch. 4 - Kinesin is a motor protein responsible for moving...Ch. 4 - Starting from rest and undergoing constant...Ch. 4 - In an egg-dropping contest, a student encases an...Ch. 4 - In a front-end collision, a 1300-kg car with...Ch. 4 - Show that the units of acceleration can be written...Ch. 4 - Your spaceship crashes on one of the Suns planets....Ch. 4 - Your friend can barely lift a 35-kg concrete block...Ch. 4 - A cereal box says net weight 340 grams. Whats the...Ch. 4 - Youre a safely engineer for a bridge spanning the...Ch. 4 - The gravitational acceleration at the...Ch. 4 - A 50-kg parachutist descends at a steady 40 km/h....Ch. 4 - A 930-kg motorboat accelerates away from a dock at...Ch. 4 - An elevator accelerates downward at 2.4 m/s2. What...Ch. 4 - At 560 metric tons, the Airbus A-380 is the worlds...Ch. 4 - Youre an engineer working on Ares I, NASAs...Ch. 4 - You slop into an elevator, and it accelerates to a...Ch. 4 - What upward gravitational force does a 5600-kg...Ch. 4 - Your friends mass is 65 kg. If she jumps off a...Ch. 4 - What force is necessary to stretch a spring 48 cm,...Ch. 4 - A 35-N force is applied to a spring with spring...Ch. 4 - A spring with spring constant k = 340 N/m is used...Ch. 4 - A 1.25-kg object is moving in the x-direction at...Ch. 4 - An airplane encounters sudden turbulence, and you...Ch. 4 - A 74-kg tree surgeon rides a cherry picker lift to...Ch. 4 - A dancer executes a vertical jump during which the...Ch. 4 - Find expressions for the force needed to bring an...Ch. 4 - An elevator moves upward at 5.2 m/s. Whats its...Ch. 4 - A 2.50-kg object is moving along the x-axis at...Ch. 4 - Blocks of 1.0, 2.0, and 3.0 kg are lined up on a...Ch. 4 - A child pulls an 11-kg wagon with a horizontal...Ch. 4 - Biophysicists use an arrangement of laser beams...Ch. 4 - A force F is applied to a spring of spring...Ch. 4 - A 22(M)-kg airplane pulls two gliders, the first...Ch. 4 - A biologist is studying the growth of rats on the...Ch. 4 - An elastic towrope has spring constant 1300 N/m....Ch. 4 - A 2.0-kg mass and a 3.0-kg mass are on a...Ch. 4 - Youre an automotive engineer designing the crumple...Ch. 4 - Frogs tongues dart out to catch insects, with...Ch. 4 - Two large crates, with masses 640 kg and 490 kg,...Ch. 4 - What force do the blades of a 4300-kg helicopter...Ch. 4 - What engine thrust (force) is needed to accelerate...Ch. 4 - Your engineering firm is asked to specify the...Ch. 4 - With its fuel tanks half full, an F-35A jet...Ch. 4 - Two springs have the same unstretched length but...Ch. 4 - Although we usually write Newtons second law for...Ch. 4 - A railroad car is being pulled beneath a grain...Ch. 4 - A block 20% more massive than you hangs from a...Ch. 4 - Youre asked to calibrate a device used to measure...Ch. 4 - A spider of mass ms drapes a silk thread of...Ch. 4 - Figure 4.27 shows vertical accelerometer data from...Ch. 4 - A hockey stick is in contact with a 165-g puck for...Ch. 4 - After parachuting through the Martian atmosphere,...Ch. 4 - Your airplane is caught in a brief, violent...Ch. 4 - Youre assessing the Engineered Material Arresting...Ch. 4 - Two masses are joined by a massless string. A 30-N...Ch. 4 - A mass M hangs from a uniform rope of length L and...Ch. 4 - Jerk is the rate of change of acceleration, and...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...
Additional Science Textbook Solutions
Find more solutions based on key concepts
Using the definitions in Eqs. 1.1 and 1.4, and appropriate diagrams, show that the dot product and cross produc...
Introduction to Electrodynamics
Whether the acceleration of the ball on the way up different from the acceleration of the ball on the way down.
Physics (5th Edition)
8. Light from a sodium lamp (?= 589 nm) illuminates two narrow slits. The fringe spacing on a screen 150 cm beh...
College Physics: A Strategic Approach (4th Edition)
12. String A weighs twice as much as string B. Both strings are thin and light and have the same length. If you...
College Physics (10th Edition)
A thin plate has a round hole whose diameter in its rest frame is D. The plate is parallel to the ground and mo...
Modern Physics
3. What is free-fall, and why does it make you weightless? Briefly describe why astronauts are weightless in th...
The Cosmic Perspective (8th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A father gives his son a ride by pulling on a sled. The father pulls the sled across the ground with a force F =75.0 N, directed 30° above %3D (Consider Newton's Laws and the forces/components} the horizontal (as shown). The combined mass of his son and sled is 44.0 kg. What normal force does the ground exert on the sled? O 394 N 485N O 270 N N 69arrow_forwardWhat is the direction of the net force, expressed as an angle in degrees measured clockwise relative to the positive x axis? Two small forces are exerted on a small 186kg asteroid by a pair of space tractors. F⃗ 1F⃗ 2==(−3.13N)î +(−4.72N)ĵ (10.58N)î +(−4.04N)ĵarrow_forwardYou find it takes 190 N of horizontal force to move an unloaded pickup truck along a level road at a speed of 2.4 m/s . You then load up the pickup and pump up its tires so that its total weight increases by 42%while the coefficient of rolling friction decreases by 19%. Now what horizontal force will you need to move the pickup along the same road at the same speed? The speed is low enough that you can ignore air resistance..arrow_forward
- Consider these two cases for the following two questions: (1) a book sits at rest on a table, touching only the table, and (2) a string pulls up on a book which is at rest on a table. 1. The magnitude of the normal force of the table on the book in (1) is _______ the magnitude of the normal force of the table on the book in (2). 2. The direction of the normal force of the table on the book in (1) is in the _______ direction as the normal force of the table on the book in (2).arrow_forwardConsider the following statement: “The normal force on an object is always equal to the weight of the object.”Select all the reasons that this statement is false . The normal force is not always parallel to the force of gravity The normal force is independent of the force of gravity The normal force is only equal to the weight of the object when sitting on a horizontal surface and there are no other forces in the y-direction except gravity The normal force causes an acceleration and therefore does not interact with gravityarrow_forwardA football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1500 NN and the angle between the two ropes is 20 ∘∘. Assume both players pull with the same force. How hard must each player pull to drag the coach at a steady 2.0 m/s?arrow_forward
- The small cart of mass m is nudged with negligible velocity from its horizontal position at A onto the parabolic path, which lies in a vertical plane. Neglect friction and show that the cart maintains contact with the path for all values of k. Then calculate the normal force N under the cart if m = 4.6 kg, k = 3.4 m²¹, and x = 1.5 m. Answer: N= i -y=kx² Narrow_forwardIf a 58.9 kg person jumps onto a seesaw at an angle of 29 degrees at a distance of 7.0 m from the fulcrum. How much force will their friend feel if they are sitting 7.0 m on the opposite side of the seesaw? If a 45.9 kg person jumps onto a seesaw at an angle of 25 degrees at a distance of 5.1 m from the fulcrum. How much force will their friend feel if they are sitting 6.4 m on the opposite side of the seesaw?arrow_forwardThis is one of three questions from #18: 18. A scale in the elevator's floor measures the weight of the passengers, and it has the correct value when the elevator is not moving. The combined mass of the passengers is 572 kg. What will the scale read if. Part b) has the elevator accelerating up at 1.5 m/s?, while part c) has it accelerating down at 1.5 m/s. Which of the following best describes the difference between part b) and part c)? Your answer: O One acceleration is positive and the other is negative because they are in opposite directions. O The upward acceleration is 1.5 m/s?, but the downward acceleration is actually -9.8 m/s?. O The upward acceleration is 1.5 m/s?, but the downward acceleration means a = 0. O The directions makes no difference, so the math will be exactly the same for b) and c)arrow_forward
- 1. In below figure, four coplanar forces act on a body at point O. Find the resultant (magnitude and direction) using GRAPHICAL METHOD. 100 N 110 N 30° 45° 20° 80 N 160 Narrow_forwardCalculate the magnitude of the normal force on a 17.7 kg block in the following circumstances. (Enter your answers in N.) HINT (a) The block is resting on a level surface. X N (b) The block is resting on a surface tilted up at a 40.8° angle with respect to the horizontal. N (c) The block is resting on the floor of an elevator that is accelerating downward at 3.28 m/s. (d) The block is on a level surface and a force of 145 N is exerted on it at an angle of 40.8° above the horizontal. Narrow_forwardA traffic light is hanging from two cables. Cable #1 pulls up and left, making an angle of 45o with the horizontal on the left, and cable #2 pulls up and to the right with a force of 50 N, making an angle of 45o with the horizontal on the right. FInd the mass of the traffic light. Hint: Apply ΣFx = 0 and ΣFy = 0arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax CollegePrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Newton's First Law of Motion: Mass and Inertia; Author: Professor Dave explains;https://www.youtube.com/watch?v=1XSyyjcEHo0;License: Standard YouTube License, CC-BY