COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 10QAP
To determine
Whether there is a contradiction of the situations which at low speeds the drag force on an object moving through a fluid is proportional to its velocity and according to Newton's law, force is proportional to acceleration.
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You pull a sled with a constant force across a level field and it moves with constant velocity instead of an increasing velocity. Doesn’t this violate Newton’s first and second laws of motion, which imply that no force is required to maintain a constant velocity? Explain this seeming contradiction. Hint: is your pulling force the only force acting on the sled?
A body begins to slide over the surface of another, when pulled with a force of 10N. If we pull with a force of 4 N, the force of friction that will come into play is:
a) Zero. b) 10N c) 6N. d) 4N
A boy drags a 100-N sled up a 20.0° slope at constant velocity. If the coefficient of friction between sled and hill is 0.2, what force must he exert at an angle of 35° with respect to the hill?
Chapter 5 Solutions
COLLEGE PHYSICS
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- Why can we neglect forces such as those holding a body together when we apply Newton’s second law?arrow_forwardA skydiver will reach a terminal velocity when the air drag equals his or her weight. For a skydiver with a large body, turbulence is a factor at high speeds. The drag force then is approximately proportional to the square of the velocity. Taking the drag force to be FD=12Av2 , and setting this equal to the skydiver's weight, find the terminal speed for a person falling "spread eagle.arrow_forwardA 9.00-kg hanging object is connected by a light, in extensible cord over a light, frictionless pulley to a 5.00-kg block that is sliding on a flat table (Fig. P5.22). Taking the coefficient of kinetic friction as 0.200, find the tension in the string.arrow_forward
- A crate of weight Fg is pushed by a force P on a horizontal floor as shown in Figure P5.45. The coefficient of static friction is s, and P is directed at angle below the horizontal. (a) Show that the minimum value of P that will move the crate is given by P=sFgsec1stan Figure P5.45 (b) Find the condition on in terms of s, for which motion of the crate is impossible for any value of P.arrow_forwardTwo expressions were used for the drag force experienced by a moving object a liquid. One depended upon the speed, while the other was proportional to the square of the speed. In which types of motion would each of these expressions be more applicable than the other one?arrow_forwardWhen you learn to drive, you discover that you need to let 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 kinetic friction.arrow_forward
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- A 4.00 kg block sits on a table top with a coefficient of static friction of 0.470 and a coefficient of kinetic friction of 0.320. A weight is attached by a string to the block so as to just overcome the force of static friction acting on the block. What is the acceleration of the block?Please give a step by step for the solution and a final answer.Thanks!!arrow_forwardAs a rocket is launched, the net force on it stays constant even though the mass decreases (in the form of rocket fuel being consumed). By using Newton's second law of motion, explain what happens to the acceleration and why.arrow_forwardA steel ball is traveling downwards through liquid at constant velocity. Given that the oil exerts a force of 4N on the ball, what is the weight of the ball? Hence, find the mass of the ball.arrow_forward
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