Concept explainers
A man stands on a scale and holds a heavy object in his hands. What happens to the scale reading if the man quickly lifts the object upward and then stops lifting it?
a. The reading increases, returns briefly to the reading when standing stationary, then decreases.
b. The reading decreases, returns briefly to the reading when standing stationary, then increases.
c. Nothing, since the mass of the person with the object remains the same, Thus the reading does not change.
Want to see the full answer?
Check out a sample textbook solutionChapter 3 Solutions
Pearson eText for College Physics: Explore and Apply -- Instant Access (Pearson+)
Additional Science Textbook Solutions
College Physics (10th Edition)
Applied Physics (11th Edition)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Lecture- Tutorials for Introductory Astronomy
Conceptual Integrated Science
- A block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.arrow_forwardThe distinction between mass and weight was discovered after Jean Richer transported pendulum clocks from Paris, France, to Cayenne, French Guiana, in 1671. He found that they quite systematically ran slower in (Cayenne than in Paris. The effect was reversed when the clocks returned to Paris. How much weight would a 90.0 kg person lose in traveling from Paris, where g = 9.809 5 m/s2, to Cayenne, where g = 9.780 8 m/s2? (We will consider how the free-fall acceleration influences the period of a pendulum in Section 15.5.)arrow_forwardAn ice cube with a mass of 0.0507 kg is placed at the midpoint of a 1.00-m-long wooden board that is propped up at a 50 angle. The coefficient of kinetic friction between the ice and the wood is 0.133. a. How much time does it take for the ice cube to slide to the lower end of the board? b. If the ice cube is replaced with a 0.0507-kg wooden block, where the coefficient of kinetic friction between the block and the board is 0.275, at what angle should the board be placed so that the block takes the same amount of time to slide to the lower end as the ice cube does? You may find a spreadsheet program helpful in answering this question.arrow_forward
- Chris, a recent physics major, wanted to design and carry out an experiment to show that an objects mass determines its inertia. He used an ultrasound device to measure acceleration of a low-friction cart attached to a hanging block to provide the same force on the cart during each run (Fig. P6.76A). Chris varied the mass of the cart by varying the number of lead rods placed in it. Chris used Newtons second law Fx=FT=Max to predict his results. He reasoned that because FT is the same for each run, the carts acceleration should be inversely proportional to its mass: ax=FTM=constantM(1) Chriss goal was to show that his data fit Equation (1). He decided to analyze his results by plotting ax as a function of 1/M; Equation (1) predicted that he should get a straight line, passing through the origin with a slope equal to the tension (red line in Fig. P6.76B): Chris ran several trials for each run, averaged his results and estimated the error. He then plotted his data (green line in Fig. P6.76B). Chris was excited to see that he correctly predicted that the data fell along a straight line: ax=(0.27N)1M(0.048m/s2) According to the straight-line fit to the data, the slope of the line is 0.27 N, which was close to the weight of the hanging mass and therefore close to the tension in the string. Chris, though, was disappointed to see that the line had a negative intercept. Mathematically, as M, 1M0. Chris was confused because he believed that as the mass increased, the carts acceleration should approach zero. He was quite sure that he did not discover some new property of inertia or mass. After convincing himself that he was not being careless in the laboratory and that his data were correct, he started to search for an explanation for the discrepancy between his prediction and his data. Help Chris find an explanation. FIGURE P6.76 A. Chriss experimental apparatus. B. Chriss prediction (red line) and experimental results (green line).arrow_forwardWhich of the following statements is correct regarding an apple hanging on a tree on earth? a. The force on the apple is greater than the force on the Earth because the Earth is more massive. b. The force on the apple is less than the force on the Earth because the tree is supporting the apple. C. The force on the Earth is greater than the force on the apple because the Earth is more massive. d. The forces on the apple and Earth are equal.arrow_forward7. To pull an old stump out of the ground, you and a friend tie two ropes to the stump. You pull on it with a force of 500 N to the north while your friend pulls with a force of 450 N to the northwest. The total force from the two ropes is A. less than 950 N. B. exactly 950 N. C. more than 950 N.arrow_forward
- What is most likely to happen when an object in motion stays in motion and an object at rest stays at rest? A. An unbalanced force acts on it. B. A balanced force acts on it. C. Objects in motion naturally come to rest. D. A constant force is required to keep it in constant motionarrow_forwardA large massive rock is in contact with the Earth. Draw a force diagram for the rock and the Earth. Which of the following statements is true? A. The contact force on the Earth due to the rock and the gravitational force on the Earth due to the rock are interaction partners. B. The gravitational force on the rock due to the Earth and the gravitational force on the Earth due to the rock y are interaction partners. C. The gravitational force on the Earth due to the rock and the contact force on the Earth due to the rock are interaction partners. D. The gravitational force on the rock due to the Earth and the contact force on the Earth due to the rock are interaction partners.arrow_forward30. An object is acted upon by an applied force F and a normal force N due to a surface with coefficients of static and kinetic friction µ, and µk, respectively. Which of the following statements is ALWAYS TRUE? A. The frictional force is opposite in direction to F. B. The static frictional force is equal to µ,N. C. The kinetic frictional force is proportional to N. D. The kinetic frictional force is greater than the static frictional force.arrow_forward
- A bus driver is driving at 25 mph and has to make an emergency stop by slamming on the bus's brakes. Later, he slams on the breaks again, but this time he is driving at 50 mph. How far will the bus skid compared to the first time? A. The stopping distance stays the same. А. B. The stopping distance is tripled. В. C. The stopping distance is quadrupled. D. The mass of the bus is required. E. The stopping distance is doubled.arrow_forwardA child of mass 43 kg stands on a scale inside an elevator. Select one or more: A. The scale would show his weight as 335.40 N when the elevator accelerates downward at 2 m/s2. B. The scale would show his weight as 507.4 N when the elevator accelerates upward at 2 m/s2. C. The scale would show his weight as 335.40 N when the elevator accelerates upward at 2 m/s2. D. The scale would show his weight as 335.40 N when the elevator decelerates upward at 2 m/s2. E. The scale would show his weight as 421.4 N when the elevator is stationary. F. The scale would show his weight as 335.4 N when the elevator decelerates upward at 2 m/s2. G. The scale would show his weight as 421.40 N when the elevator moves with a constant velocity 2.5 m/s.arrow_forwardA box is pulled at a constant speed, v, along a horizontal surface with a kinetic coefficient of friction less than 1. The person pulls with a constant horizontal force, F, on the box. The constant horizontal force the person pulls with: A. Has the same size as the weight of the box. B. Is greater than the weight of the box. C. Is less than the weight of the box. D. Is greater than the friction force.arrow_forward
- Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
- College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning