COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 27QAP
To determine
The condition of an object in absence of a net force.
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1) Listen
When a 54.0-kg crate is pushed across a frictionless horizontal floor with a force of
240.0 N, directed 20.0° below the horizontal, the magnitude of the aceleration of
the crate is m/s².
20.0
A rope exerts a constant horizontal force of 280 N to pull a 50kg crate across the floor. the velocity of the crate is observed to increase from 1m/s to 7m/s in a time of 2 seconds under the influence of this force and the frictional force exerted by the floor on the crate. What force would have to be applied to the crate by the rope in order for the crate to move with constant velocity? Explain
2) A 400-N block is dragged along a horizontal surface by an applied force F as shown. The coefficient of
kinetic friction is uk = 0.4 and the block moves at constant velocity. The magnitude of F is:
(3/5) F
(4/5) F
A) 100 N
B) 150 N
C) 200 N
D) 290 N
E) 400 N
Chapter 4 Solutions
COLLEGE PHYSICS
Ch. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAPCh. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAP
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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
- Describe a situation in which the net external force on a system is not zero, yet its speed remains constant.arrow_forwardCalculate the normal force on a 15.0 kg block in the following circumstances: (a) The block is resting on a level surface. (b) The block is resting on a surface tilted up at a 30.0 angle with respect to the horizontal. (c) The block is resting on the floor of an elevator that is accelerating upwards at 3.00 m./s2. (d) The block is on a level surface and a force of 125 N is exerted on it at an angle of 30.0 above the horizontal. (Sec Section 1.5.)arrow_forwardA 3.00-kg block starts from rest at the top of a 30.0 incline and slides a distance of 2.00 m down the incline in 1.50 s. Find (a) the magnitude of the acceleration of the block, (b) the coefficient of kinetic friction between block and plane, (c) the friction force acting on the block, and (d) the speed of the block after it has slid 2.00 m.arrow_forward
- A magician pulls a tablecloth from under a 200-g mug located 30.0 cm from the edge of the cloth. The cloth exerts a friction force of 0.100 N on the mug and is pulled with a constant acceleration of 3.00 m/s2. How far does the mug move relative to the horizontal tabletop before the cloth is completely out from under it? Note that the cloth must move more than 30 cm relative to the tabletop during the process.arrow_forwardAs a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 61.0 kg. If this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 6.00 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine (a) the salmons acceleration and (b) the magnitude of the force F during this interval.arrow_forwardAn object of mass m is dropped al t = 0 from the roof of a building of height h. While the object is falling, a wind blowing parallel to the face of the building exerts a constant horizontal force F on the object. (a) At what time t does the object strike the ground? Express t in terms of g and h. (b) Find an expression in terms of m and F for the acceleration ax of the object in the horizontal direction (taken as the positive x direction). (c) How far is the object displaced horizontally before hitting the ground? Answer in terms of m, g, F, and h. (d) Find the magnitude of the objects acceleration while it is falling, using the variables F, m, and g.arrow_forward
- PROBLEM 2 • An elevator and its load have a total mass of 800kg.Find the tension in the supporting cable when the elevator or lift originally moving downwards at 10m/s is brought to rest with a constant acceleration in a distance 25m Answer T-9600N.Since T> W the system is retarding.arrow_forward3) A crate of mass of mass 180.0 kg is pushed with intial speed of 33 m/s along a concrete floor. If the crate comes to rest after covering 30 m, determing the coeficient of kinetic friction between thecrate and the floor. A B C D E 0.435 0.476 0.615 0.492 0.532arrow_forwardPlease select TWO options as your correct answers. TWO correct answers will give you correct answer.WRONG answers If you choose ONE answer only or only ONE answer is correct. In a Tesco supermarket parking lot, an employee is pushing ten empty shopping carts, lined up in a straight line. The acceleration of the carts is 0.050ms ^ -2 . The ground is level, and cach cart has a mass of 2.6 kg. (i) What is the net force acting on any one of the carts? (ii) Assuming friction is negligible, what is the force exerted by the firth cart on the sixth cart? A. 0.13 N B. 0.65 N C. 1.25 N D. 1.30 N E. 6.50 Narrow_forward
- 5) A 6 kg block initially at rest is pulled to the right along a frictionless, horizontal surface by a constant horizontal force of 12 N. Find the block's speed after it has moved 3 m.arrow_forward32 - A diver with a mass of 70 kg jumps from the 10.0 meter high tower for a direct-vertical dive. Its movement ends at 2.50 meters below the water level. Find the average drag force exerted by the water on the diver. a) 3.09 kN B) 5.34 kN NS) 1.50 kN D) 1.05 kN TO) 4.12 kNarrow_forward25 - A diver with a mass of 70 kg jumps from the 10.0 meter high tower for a direct-vertical dive. Its movement ends at 2.50 meters below the water level. Find the average drag force exerted by the water on the diver. A) 1.50 kN B) 4.12 kN C) 3.09 kN D) 5.34 kN E) 1.05 kNarrow_forward
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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