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 34E
You slop into an elevator, and it accelerates to a downward speed of 9.2 m/s in 2.1 s. Quantitatively compare your apparent weight during this time with your actual weight.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Fernanda is standing on a scale while riding an elevator. The elevator accelerates upward from rest to 1.8m/s1.8m/s in 2.0 s. If the scale reads 720 N while the elevator is accelerating upwards, what is Fernanda’s mass?
A student weighs 200 N. If he is in an elevator that is accelerating upward at 2.00 m/s/s, what will be his apparent weight?
Zola (the wonder dog) is told to sit and stay on a bathroom scale that reads 150 newtons with her on it. But soon she gets bored with sitting on the scale and leaps straight up into the air with an acceleration of magnitude 2m/s2.
a) What is Zola's mass?
b) What is the reading on the scale when she launches herself upward?
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
42. A bicycle wheel is rotating at 50 rpm when the cyclist begins to
pedal harder, giving the wheel a constant...
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
Review Question 3.5 Your friend says that m is a force exerted on an object and it should be represented on t...
College Physics
The pV-diagram of the Carnot cycle.
Sears And Zemansky's University Physics With Modern Physics
If a rigid body has a constant angular acceleration, what is the functional form of the angular position?
University Physics Volume 1
39. || bio Bird migration. Canada geese migrate essentially along a north–south direction for well over a thous...
College Physics (10th Edition)
14.47 A building in San Francisco has light fixtures consisting of small 2.35-kg bulbs with shades hanging from...
University Physics with Modern Physics (14th 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
- You have most likely been in an elevator that accelerates upward as it moves toward a higher floor. In this case, you feel heavier. In fact, if you are standing on a bathroom scale at the time, the scale measures a force having a magnitude that is greater than your weight. Therefore, you have tactile and measured evidence that leads you to believe you are heavier in this situation. Are you heavier?arrow_forwardA 75 kg astronaut brings a standard bathroom scale with him into space. What does the scale read if the astronaut weighs himself on the moon where g = 1.61 m/s2? Express your answer in kg.arrow_forwardA woman in a lift is trying to weigh a parcel with a spring scale. The lift accelerates downwards at 1.7 m/s, then travels at a constant speed of 3 m/s, and finally decelerates at 1.1 m/s. During the first stage of the motion, the scale reads 6.6 kg. Note: a spring scale is a device for measuring weight, where the parcel is suspended below a spring that is attached to a dial. The extension of the spring is proportional to the weight of the parcel, but the dial is calibrated to give the mass of the parcel in kilograms. The dial will only give the correct mass if the parcel is subjected to the Earth's normal gravity. What does the scale read during the other stages of the motion? Second Stage kg. Third Stage kg. Give your answers correct to 1 decimal place.arrow_forward
- Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 6.2-kg projectile from rest to a speed of 3.1 × 103 m/s. The net force accelerating the projectile is 4.8 × 105 N. How much time is required for the projectile to come up to speed?Type your answer here Units Choose your answer herearrow_forwardConsider a human who weighs 862 N on Earth. What is the person's mass on Earth? And what is the same person's mass on Mars, where the acceleration due to gravity is 3.7 m/s2?arrow_forwardA person of mass M-80 kg stands on a scale inside an elevator to measure her apparent weight. What will her apparent weight be if the elevator moving up with an initial velocity V = (4j) m/s slows down under constant acceleration to stop in a distance d=4m ? (Acceleration due to Earth's gravity is ở = (– 1oj) m/s² ) 320 N 480 N 640 N 960 N 1280 Narrow_forward
- Mary applies a force of 78 N to push a box with an acceleration of 0.40 m/s2. When she increases the pushing force to 90 N, the box's acceleration changes to 0.66 m/s?. There is a constant friction force present between the floor and the box. (a) What is the mass of the box in kilograms? kg (b) What is the coefficient of kinetic friction between the floor and the box?arrow_forwardJoe pushes down the length of the handle of a 14.1 kg lawn spreader. The handle makes an angle of 47.1° with the horizontal. Joe wishes to accelerate the spreader from rest to 1.39 m/s in 1.7 s. What force must Joe apply to the handle? Answer in units of N.arrow_forwardA physics student, in a stationary elevator, places a 240.0 g mass on an electronic balance. The student hits the elevator button and it begins to move upwards. Just before the elevator comes to a stop at a higher floor, the balance 198.0 g. What is the acceleration of the elevator? Consider: UP to be (+), DOWN to be (-) and g =9.8 m/s - Give your answer in m/s2 to 2 decimal placesarrow_forward
- Mary applies a force of 75 N to push a box with an acceleration of 0.43 m/s?. When she increases the pushing force to 85 N, the box's acceleration changes to 0.68 m/s?. There is a constant friction force present between the floor and the box. (a) What is the mass of the box in kilograms? kg (b) What is the coefficient of kinetic friction between the floor and the box?arrow_forwardA 4.0 kg sphere and 8.0 kg sphere are both dropped from the same height at the same time. If the two objects are experiencing free fall, what is true about the spheres? Your answer: The 4.0 kg sphere will hit the ground first because it is easier to accelerate. The 8.0 kg sphere will hit the ground first because the force of gravity on it will be stronger. They will hit the ground at the same time. Neither one will ever hit the ground.arrow_forwardZach, whose mass is 77 kg, is in an elevator descending at 12 m/s. The elevator takes 3.2 s to brake to a stop at the first floor. Part A: What is Zach's weight before the elevator starts braking? Part B: What is Zach's weight while the elevator is braking?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.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