Concept explainers
(a)
The reading of the scale when the elevator is ascending with the speed of
(a)
Answer to Problem 65P
The reading indicated by the scale is
Explanation of Solution
Given:
The mass of the block is
Formula used:
The expression for the weight of the block is given by,
As the object is ascending at a constant speed, thus the reading of scale will be equal to the tension in the string and the expression for the tension of the string is given by,
Calculation:
The weight of the block is calculated as,
The tension of the string is calculated as,
Conclusion:
Therefore, the reading indicated by the scale is
(b)
The reading of the scale when the elevator is descending with the speed of
(b)
Answer to Problem 65P
The reading indicated by the scale is
Explanation of Solution
Given:
The mass of the block is
Formula used:
The expression for the weight of the block is given by,
As the object is descending at a constant speed, thus the reading of scale will be equal to the tension in the string and the expression for the tension of the string is given by,
Calculation:
The weight of the block is calculated as,
The tension of the string is calculated as,
Conclusion:
Therefore, the reading indicated by the scale is
(c)
The reading of the scale when the elevator is ascending with the speed of
(c)
Answer to Problem 65P
The reading indicated by the scale is
Explanation of Solution
Given:
The mass of the block is
Formula used:
Consider the upward acceleration of the block is
The expression for the reading of the scale is given by,
Calculation:
The value of the reading of the scale is calculated as,
Conclusion:
Therefore, the reading indicated by the scale is
(d)
The reading of the scale for the time interval
(d)
Answer to Problem 65P
The reading indicated by the scale for different time interval is
Explanation of Solution
Given:
The mass of the block is
Formula used:
The expression for the reading of the elevator during the first
The block comes to rest in
The reading of the scale will be equal to the tension in the string and the expression for the tension in the string is given by,
Calculation:
The value of the reading of the scale during the first
The acceleration of the block after
The reading of the scale is calculated as,
Thus, the reading of the scale for different time interval is given by,
Conclusion:
Therefore, the reading indicated by the scale for different time interval is
Want to see more full solutions like this?
Chapter 4 Solutions
Physics for Scientists and Engineers
- A body of mass 5 kg is dropped from a height of 100ft with zero velocity. Assuming no air resistance, find an expression for the velocity at any time tarrow_forwardA slanted roof rises at 35° above the horizontal, and the straight-line distance from the top of the roof to the bottom edge is 4.5 m. The roof is covered with ice, so it offers no friction to objects sliding on it. A piece of ice at the top suddenly breaks loose and begins to slide down from rest.(a) How long will it take for the ice to reach the bottom edge of the roof?(b) How fast will the ice be traveling just as it reaches the bottom edge?arrow_forwardA frictionless plane is 10.0 m long and inclined at 30.0°. A sled starts at the bottom with an initial speed of 5.30 m/s up the incline. When the sled reaches the point at which it momentarily stops, a second sled is released from the top of the incline with an initial speed v₁. Both sleds reach the bottom of the incline at the same moment. (a) Determine the distance that the first sled traveled up the incline. m (b) Determine the initial speed of the second sled. m/sarrow_forward
- Florida Stock/Shutterstock.com Figure 5-12 The force on a woodpecker's head when drilling a hole in a tree is huge. Woodpeckers' heads have several unique features to reduce the shock to the brain, including a thin layer of fluid between the skull and brain (Question 5-29).arrow_forwardA stone is thrown horizontally with an initial speed of 35 m/s from a bridge. Find the stone's total speed when it enters the water 4 seconds later. Assuming that air resistance is negligible.arrow_forwardWhat is the normal force exerted by an elevator on 55kg person if the elevator is moving upward at a constant velocity of 2.2m/sarrow_forward
- A 60 kg person stands on a scale in an elevator. How many Newtons does the scale read: a) when the elevator is ascending with an acceleration of 1 m/s2? b) when the elevator is descending with an acceleration of 1 m/s2? c) when the elevator is ascending at a constant speed of 3 m/s?arrow_forwardAn elevator in a tall building is allowed to reach a maximum speed of 3.5m/s going down. What must the tension be in the cable to stop this elevator over a distance of 2.6 m if the elevator has a mass of 1450 kg including occupants?arrow_forwardA bicyclist is approaching an inclined stretch of road at 14 m/s. If he stops peadlaing at the bottom how much vertical height will he achieve?arrow_forward
- A ball is hung by a cord from the ceiling of an elevator. In which of the conditions below, the tension in the cord will be greatest? O Elevator moving down with a uniform speed Elevator moving down with a decreasing speed Elevator moving down with an increasing speed O Elevator at restarrow_forwardA crate slides down a ramp. Once reaching the bottom of the ramp, the crate slides 15 m horizontally across the floor to a wall. The crate reaches the wall 2.5 s after leaving the ramp. If the ramp is at an elevation angle of 15°, how long is the ramp? Ignore friction.arrow_forward1) In Figure, a block with mass m = 1 kg is released from height h, friction until it reaches the path with first length d,= 3 m, where the friction force between B and C is f, = 9 N, and until it reaches the path, where the friction force between E and F is f, = 7 N. The height is h, = 1 m, and second horizontal length is d,= 1 m. The block continues its motion after the point F. (a) Find the velocity at the point A. (b) Find the velocity at the point D. (c) Find the height h if the velocity of m is v= 9 m/s at the point F.(sin45=0.7 g=9.8 m/s²) 11 m. Its path is without 1 m (F d,=1 m h h, = 11 m D 45° E d,=3 m h,=1 m A Вarrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON