EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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(3.) In the figure shown below, the 20 kg block is acted upon by friction (assume µk = 0.39) and is connected
by cords that do not break or stretch to the freely-hanging 10 kg and 30 kg blocks.
(a) Draw a freebody diagram for each object, taking the +x-axis in the direction of motion in each case,
and let TL and TR be the tensions in the left and right cords, as shown, respectively, in the figure.
f201
TR
30
10
(b) Solve for the friction force fg on the 20 kg block.
(C) Apply Newton's 2nd law to all three objects (freebodies), and write the three appropriate equations.
(d) Solve these equations simultaneously for the tensions (TL and TR) in the cords and the acceleration (a)
of the whole system.
A body of mass 9 kg moves along the x-axis
under the action of a force given by: F = (-3x) N
%3D
Find (a) the equation of motion; (b) the
displacement of the mass at any time, if t=0
then x = 5 m and 0 =v
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Chapter 4 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
Ch. 4.4 - Suppose you watch a cup slide on the (smooth)...Ch. 4.5 - Prob. 1BECh. 4.5 - If you push on a heavy desk, does it always push...Ch. 4.5 - Return to the first Chapter-Opening Question, page...Ch. 4.7 - Prob. 1FECh. 4.7 - Prob. 1GECh. 4.7 - Prob. 1HECh. 4 - Why does a child in a wagon seem to fall backward...Ch. 4 - If an object is moving, is it possible for the net...Ch. 4 - If the acceleration of an object is zero, are no...
Ch. 4 - Only one force acts on an object. Can the object...Ch. 4 - When a golf ball is dropped to the pavement, it...Ch. 4 - If you walk along a log floating on a lake, why...Ch. 4 - (a) Why do you push down harder on the pedals of a...Ch. 4 - Prob. 9QCh. 4 - The force of gravity on a 2-kg rock is twice as...Ch. 4 - Prob. 11QCh. 4 - When an object falls freely under the influence of...Ch. 4 - Compare the effort (or force) needed to lift a...Ch. 4 - When you stand still on the ground, how large a...Ch. 4 - Whiplash sometimes results from an automobile...Ch. 4 - Mary exerts an upward force of 40N to hold a bag...Ch. 4 - A father and his young daughter are ice skating....Ch. 4 - Prob. 19QCh. 4 - Which of the following objects weighs about 1 N:...Ch. 4 - Why might your foot hurt if you kick a heavy desk...Ch. 4 - When you are running and want to slop quickly, you...Ch. 4 - Suppose that you are standing on a cardboard...Ch. 4 - Prob. 2MCQCh. 4 - Prob. 3MCQCh. 4 - Prob. 4MCQCh. 4 - Prob. 5MCQCh. 4 - Prob. 7MCQCh. 4 - Prob. 9MCQCh. 4 - Prob. 10MCQCh. 4 - Prob. 11MCQCh. 4 - Prob. 12MCQCh. 4 - Prob. 13MCQCh. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - (II) Superman must stop a 120-km/h train in 150 m...Ch. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - (II) A fisherman yanks a fish vertically out of...Ch. 4 - Prob. 12PCh. 4 - (II) A 20.0-kg box rests on a table. (a) What is...Ch. 4 - (II) A particular race car can cover a...Ch. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - (II) Can cars stop on a dime? Calculate the...Ch. 4 - Prob. 19PCh. 4 - (II) Using focused laser light, optical tweezers...Ch. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - (II) An exceptional standing jump would raise a...Ch. 4 - (II) High-speed elevators function under two...Ch. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - (I) Draw the free-body diagram for a basketball...Ch. 4 - (I) A 650-N force acts in a northwesterly...Ch. 4 - (I) Sketch the tree body diagram of a baseball (a)...Ch. 4 - Prob. 32PCh. 4 - Prob. 33PCh. 4 - Prob. 34PCh. 4 - (II) The cords accelerating the buckets in Problem...Ch. 4 - Prob. 36PCh. 4 - (II) A train locomotive is pulling two cars of the...Ch. 4 - Prob. 38PCh. 4 - (II) A skateboarder, with an initial speed of...Ch. 4 - (II) At the instant a race began, a 65-kg sprinter...Ch. 4 - (II) A mass m is at rest on a horizontal...Ch. 4 - Prob. 42PCh. 4 - (II) A 27-kg chandelier hangs from a ceiling on a...Ch. 4 - (II) Redo Example 413 but (a) set up the equations...Ch. 4 - (II) The block shown in Fig. 4-43 has mass m = 7.0...Ch. 4 - Prob. 46PCh. 4 - Prob. 47PCh. 4 - Prob. 48PCh. 4 - Prob. 49PCh. 4 - (II) As shown in Fig. 4-41, five balls (masses...Ch. 4 - A super high-speed 14-car Italian train has a mass...Ch. 4 - Prob. 52PCh. 4 - Prob. 53PCh. 4 - (II) A child on a sled reaches the bottom of a...Ch. 4 - Prob. 55PCh. 4 - Prob. 56PCh. 4 - (III) Determine a formula for the acceleration of...Ch. 4 - (III) Suppose the pulley in Fig. 446 is suspended...Ch. 4 - Prob. 59PCh. 4 - (II) Three blocks on a frictionless horizontal...Ch. 4 - Prob. 61PCh. 4 - (III) A small block of mass m rests on the sloping...Ch. 4 - (III) The double Atwood machine shown in Fig. 4-48...Ch. 4 - (III) Determine a formula for the magnitude of the...Ch. 4 - Prob. 65PCh. 4 - Prob. 66PCh. 4 - Prob. 67GPCh. 4 - Prob. 69GPCh. 4 - Prob. 70GPCh. 4 - Prob. 71GPCh. 4 - Prob. 72GPCh. 4 - Prob. 73GPCh. 4 - Prob. 74GPCh. 4 - Prob. 75GPCh. 4 - A block (mass mA) lying on a fixed frictionless...Ch. 4 - Prob. 77GPCh. 4 - Prob. 78GPCh. 4 - (a) What minimum force F is needed to lift the...Ch. 4 - Prob. 80GPCh. 4 - A jet aircraft is accelerating at 3.8m/s2 as it...Ch. 4 - Prob. 82GPCh. 4 - Prob. 83GPCh. 4 - A fisherman in a boat is using a 10-lb test...Ch. 4 - Prob. 85GPCh. 4 - Prob. 86GPCh. 4 - Prob. 87GPCh. 4 - Prob. 88GPCh. 4 - Prob. 90GPCh. 4 - Prob. 91GPCh. 4 - Prob. 92GPCh. 4 - Prob. 93GPCh. 4 - Prob. 94GP
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- (3) A force F moves the 2.0 kg block on a horizontal plane. Fig. 3 shows the velocity (v) of the block as a function of time (t). The normal force N of floor on m acting in the first 2 seconds is A) 8N B) 20 C) 8 N D) 27 N (4) A 3.0-kg object is moving in a plane, with its x and y coordinates given by x = 5t² - 1 and y = 3t ³ + 2, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 2.0 s. A) 108 N B) 138 N C) 30 N D) 112 N F 60° 4 m = 2 kg v. (m/s) 2 Fig.3 4 -t(s)arrow_forwardA body of mass 100 gm is suspended from a light spring which stretches it by 10 cm. Find the force constant of the spring,arrow_forwardFind the magnitude of force on the mass at t=1.00s;arrow_forward
- Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 79 kg, and the mass of the woman is 54 kg. The woman pushes on the man with a force of 58 N due east. Determine the acceleration (magnitude and direction) of (a) the man and (b) the woman. (a) aman (b) awom 0.73 i -1.1 eTextbook and Media m/s^2 v m/s^2 v due east due westarrow_forwardA 5 kg block resting on a frictionless inclined plane with an inclination angle of 20 degrees is attached to another 5 kg block that hangs freely by a string passing over a massless, frictionless pulley. What is the resulting acceleration of the two blocks. please include clear solutions :)))))arrow_forward(2) A 10.0 kg mass has the following two forces acting on it F₁ = (28 N)i + (-20N)j F₂ = (-32 N)i + (17 N)j (a) Find Fnet = F₁ + F2 in į, j notation. [Answer: Fnet = (-4 N)i + (-3 N)j] (b) Write a in i. j notation. [Answer: a = (-0.4 m/s²)i + (-0.3 m/s²)j] (c) Find a (magnitude and direction) of the acceleration of the mass. [answer: a = 0.5 m/s² at an angle 36.9° below the negative x-axis]arrow_forward
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- (2) A force with magnitude 8.86 N pushes three boxes with masses m₁ = 1.30 kg, m2 = 3.20 kg, and m3 = 4.90 kg, as shown in the figure below. The surface the boxes are sliding on is so slippery that the surface can be considered to be frictionless. (a) Calculate the force that boxes 1 and 2 exert on each other and the force that boxes 2 and 3 exert on each other. [answer: F2-on-1 = F1-on-2 = 7.63 N; F3-on-2 = F2-on-3 = 4.62 N]. (b) To obtain the values of F1-on-2 and F3-on-2 in (a), you needed to assume that Newton's 3rd Law is valid. If you examine the FBD for m2, you should see that F1-on-2-F3-on-2= m2a. Verify the validity of Newton's 3rd Law by showing that the values of F1-on-2 - F3-on-2 and m2a are indeed equal. [answer: They are both equal to 3.0 N.] Fnet = ma F = 8.86 N 1.30 kg 3.20 kg t 4.90 kgarrow_forward(d) What are the two conditions for forces that are equal in magnitude and opposite in direction to be Newton's 3rd law pairs? (e) What is an inertial reference frame? Give one way that you can tell if your frame is NOT an inertial reference frame, i.e., that it is a non-inertial reference frame. referencearrow_forward1. Two blocks are connected by a massless rope as shown below. The mass of the block on the table is m₁ and the hanging mass is m₂. The table and the pulley are frictionless. a₁ y m₁ X 3 Subpart 1: Draw FBDs In your notebook, draw free body diagrams for m, and m₂ using the template as shown below. The forces acting on the system are weights of the blocks, m₁g, and mêg, the tension in the string T and the normal reaction N₁ of the table on m₁. m m₂ Subpart 2: Set up Newton's Second Law Equations a2 m₂arrow_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