An elevator suspended by a cable is descending at constant velocity. How many forcevector would be shown on a free-body diagram? Name them.
The force vectors acting on the elevator under given conditions
Explanation of Solution
The elevator is descending at a constant velocity.
Since the elevator is descending at a constant velocity, it experiences no acceleration. Therefore, the net force acting on the elevator is zero. The elevator is supported by the cable. Therefore, the tension of the cable acts upward. The other force on the elevator is its weight. The situation is explained by the free-body diagram given below.
When the net force acting on the elevator is zero and two forces act on it, both forces will be equal in magnitude and opposite in direction.
Conclusion:
There are two forces acting on the elevator when it is descending with a constant velocity. The forces are the tension of the cable and the weight of the elevator.
Want to see more full solutions like this?
Chapter 5 Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Additional Science Textbook Solutions
Sears And Zemansky's University Physics With Modern Physics
The Cosmic Perspective Fundamentals (2nd Edition)
Conceptual Integrated Science
Physics (5th Edition)
Cosmic Perspective Fundamentals
- A 65-Kg woman descends in an elevator that briefly accelerates at 0.20g downward. She stands on a scale that reads in Kg. a-) During this acceleration, what is her weight and what does the scale read? b-) What does the scale read when the elevator descends at a constant speed of 2.0 m/s?arrow_forwardSuppose you jump from the cliffs of Acapulco and perform a perfectswan dive. As you fall, you exert an upward force on the Earth equalin magnitude to the downward force the Earth exerts on you. Why,then, does it seem that you are the one doing all the accelerating?Since the forces are the same, why aren’t the accelerations?arrow_forwardA ball is thrown up from the ground with some initial velocity at an angle of 45degree to the horizontal. If it travels 30m horizontally before landing again. a) Find initial launch velocity? b) Findthe highest point it reaches? A box is at rest on a table. The book has a mass of 6 kg. You pull straight upwards on the box by a rope attached to it with a force of 10 N and the box remains at rest. What is the normal force on the box due to the table?arrow_forward
- You are in an elevator standing on a scale. The scale reads the normal force that it needs to exert on you (upwards) so you stay on top of it. What would the FBD of you look like if the elevator was at rest?arrow_forwardA frictionless surface is inclined at an angle of 30.0° relative to the horizontal. A 10.0 kg box on the ramp is attached to a 12.0 kg box using a frictionless pulley, as shown in figure. When released from rest, m1 will move up the ramp. (a) Draw a free-body diagram for each box.(b) Is the magnitude of acceleration the same for two boxes? Explain your answer.(c) Write Newton’s second law equations for both objects.(d) Find the tension in the string and the acceleration of the box on the ramp (m1).(e) Starting from rest, how long does it take for m1 to move 2.00 m along the surface?arrow_forwardI have a question for elevator problems: Newton's law states that there is always an equal and opposite force. But for elevator problems, if it accelerates upwards... we say that the normal force is greater than the gravitational force. So is Newton's third law still applied here and if so how? Because technically the opposite force is not equal in magnitude for it to be able to acceleratearrow_forward
- a 2000-kg car initially at rest is held by a friction force that can resist up to 1200 N. If the person can push with a force of 500 N, what is the minimum number of people needed to overcome the friction force? What is the accleration?arrow_forwardAn egg is free-falling from a nest in a tree. Neglect air resistance. Diagram the forces acting on the egg as it is falling (Fgrav). A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance. Diagram the forces acting on the squirrel. (Fgrav and Fair)arrow_forwardOn a beautiful winter Sunday, you drag your two nieces in a sleigh on a snowy sidewalk. You pull on the rope with a force of 50N oriented 30 degrees above the horizontal. Julie, 25 kg, is in the first sled. Behind her, tied by another rope, is Marie's sled, 15 kg. Calculate the acceleration experienced by your nieces: Calculate the tension in the middle string (between the two sleds):arrow_forward
- Riders on the Power Tower are launched skyward with an acceleration of 4.0 g, after which they experience a period of free fall. A: What is a 60kg riders apparent weight during the launch? B: What is a 60 kg riders apparent weight during the period of free fall?arrow_forwardHint Check Answer stion 8 of 8 Suppose a 61.5 kg gymnast climbs a rope. What is the tension in the rope if she climbs at a constant speed? tension: What is the tension in the rope if she accelerates upward at a rate of 1.15 m/s"? tension: Question Credit: OpenStax College Physicsarrow_forwardThree blocks are suspended at rest by the system of strings and frictionless pulleys shown in the figure below, where W = 43.0 N, and ? = 26.4°. What are the weights w1 and w2?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning