COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 4, Problem 56QAP
To determine
The maximum magnitude of acceleration of two car system
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The coefficient of static friction between a persons shoe and the ground is 0.80. Determine the maximum magnitude of acceleration of a 60 kg person, if he starts running on a horizontal surface from rest.
25- A Hospital bed requires a frictional force Fr to keep it moving with constant velocity across a floor. If the coefficient of friction is μ, then the normal force N is given by:
A.μ /Fr
B.μ Fr
C.Fr /μ
D.Fr
E.μ
55.
Subject :- Physics
You are designing a high-speed elevator for a new skyscraper. The elevator will have a mass limit of 2400 kg (including passengers). For passenger comfort, you choose the maximum ascent speed to be 18.0 m/s, the maximum descent speed to be 10.0 m/s, and the maximum acceleration magnitude to be 3.30 m/s2. Ignore friction. What is the minimum value of a 60.0-kg passenger’s apparent weight during the ascent?
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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- 3. Jasmine is driving her car at 90.0km / h when she sees a squirrel . She slams on her breaks and is able to stop after moving 15.0 m . If the mass of the car is 1500.00 kg determine the coefficient of kinetic friction acting on the car .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 salmon’s acceleration and (b) the magnitude of the force F during this interval.arrow_forwardAn object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes,then state an example.arrow_forward
- A 2200 kg car is driving down a highway at a constant velocity when a deer jumps out onto the road 50.5 m ahead. The coefficient of friction between the car tires and the road is 0.29. Calculate the initial velocity of the car if it is able to stop just before hitting the deer. (You do not need to account for reaction time of the driver. Assuming the car is breaking the entire 50.5 m distance and that friction is the only force stopping the car.) v0 = m/sarrow_forward1. How fast can you accelerate 60-kg object if you push on it with 120-newton of force? (Assume no friction opposes you.)arrow_forwardThe Top Thrill Dragster stratacoaster at Cedar Point Amusement Park in Ohio uses a hydraulic launching system to accelerate riders from 0 to 54 m/s (120 mi/hr) in 3.8 seconds before climbing a completely vertical 420-foot hill . Determine the net force required to accelerate an 86-kg man.arrow_forward
- A 65-kg ice skater pushes off his partner and accelerates backwards at 1.15 m/s2. If the partner accelerates in the opposite direction at 1.65 m/s2. Find the mass of the other skater assuming that frictional forces are negligible.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 a tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 48.5 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 5.80 m/s after two-thirds of its length has left the surface. what is the magnitude of the force F during the intervalarrow_forward3. A 25.0-kg block is initially at rest on a horizontal surface. A horizontal force of 75.0 N is required to set the block in motion, after which a horizontal force of 60.0 N is required to keep the block moving with constant speed. Find the coefficient of kinetic friction between the block and the surface.arrow_forward
- As 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_forwardSuppose you are driving a car at a high speed. Why should you avoid slamming on your brakes when you want to stop in the shortest possible distance? (Newer cars have antilock brakes that avoid this problem.)arrow_forwardWhen you learn to drive, you discover that you need to up slightly on the brake pedal as you come to a stop or the car will stop with a jerk. Explain this in terms of the relationship between static and friction.arrow_forward
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Newton's Second Law of Motion: F = ma; Author: Professor Dave explains;https://www.youtube.com/watch?v=xzA6IBWUEDE;License: Standard YouTube License, CC-BY