EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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(2) Two forces F₁ = (36.0 N)i - (16.0 N)j and F₂(x,y) = (ax)i + (by)j displace a 12.0 kg object from the
point (10.0 m, 10.0 m) to the point (30.0 m, 40.0 m). The numerical values of a and b are 6.0 and 8.0
respectively when the units of F2(x,y) are Newtons.
(a) What are the units of a and b?
(b) Calculate the work done on the object by the net force (Fnet = F₁ + F2) acting on it. (answer: 8640 J)
(c) If the object started from rest at (10.0 m, 10.0 m), what was its speed when it reached (30.0 m, 40.0
m)? (answer: 37.9 m/s)
(II) A 27-kg chandelier hangs from a ceiling on a vertical 4.0-m-long wire. (a) What horizontal force would be necessary to displace its position 0.15 m to one side? (b) What will be the tension in the wire?
Two masses are hang over an ideal pulley using a rope. One mass is m1=120N and the other is m2=63N. Determine the tension of the rope when: (a) You hold m2 so that it won't mave: (b) You release m2 and m1 descends: (c) m1 lands and the two buckets come to rest.
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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- (II) Two snowcats in Antarctica are towing a housing unit north, as shown in Fig. 4–50. The sum of the forces F→A and F→B exerted on the unit by the horizontal cables is north, parallel to the line L, and FA = 4500 N. Determine FB and the magnitude of F→A+F→B.arrow_forwardSuppose you have a 110-kg wooden crate resting on a wood floor. (a) What maximum force can you exert horizontally on the crate without moving it?arrow_forward(II) A small box is held in place against a rough verticalwall by someone pushing on it with a force directed upwardat 28° above the horizontal. The coefficients of static andkinetic friction between the box and wall are 0.40 and0.30, respectively. The box slides down unless the appliedforce has magnitude 23 N. What is the mass of the box?arrow_forward
- A 1-N pendulum bob is held at an angle 0 from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob (in newtons) is: /// 114 O cos 0 O2/ cos 0 01 O none of the given choices O √5 Farrow_forwardTwo boxes are connected by a lightweight (mass-less!) cord & are resting on a smooth (frictionless!) table. The masses are mA =10 kg & mB = 3 kg. A horizontal force F = 80 N is applied to mA. Calculate: Acceleration of the boxes. Tension in the cord connecting the boxes.arrow_forward13-2. The two boxcars A and B have a weight of 20 000 lb and 30 000 lb, respectively. If they are freely coasting down the incline when the brakes are applied to all the wheels of car A, determine the force in the coupling C between the two cars. The coefficient of kinetic friction between the wheels of A and the tracks is uz = 0.5. The wheels of car B are free to roll. Neglect their mass in the calculation. Suggestion: Solve the problem by representing single resultant normal forces acting on A and B, respectively. вarrow_forward
- The 10-kg lamp in Fig. 3-11a is suspended from the three equal-length cords. Determine its smallest vertical distance s from the ceiling if the force developed in any cord is not allowed to exceed 50 N.arrow_forwardA box filled with appliances rests on a floor. Only gravity and the support force of the floor act on it. When a slight pull P is exerted on the box but not enough to move it, the force of friction would be:arrow_forwardA child on a sled comes flying over the crest of a small hill, as shown in Fig. 5–32. His sled does not leave the ground, but he feels the normal force between his chest and the sled decrease as he goes over the hill. Explain this decrease using Newton's second law. FIGURE 5–32 Question 5.arrow_forward
- (I) At the surface of a certain planet, the gravitational acceleration g has a magnitude of 12.0 m/s2 A 24.0-kg brass ball is transported to this planet. What is (a) the mass of the brass ball on the Earth and on the planet, and (b) the weightof the brass ball on the Earth and on the planet?arrow_forwardQUESTION 12 A person pushes a crate of mass 48 kg upa ramp at angle 26 with the horizontal. The coeficient of static friction along the ramp is 0.45, and the coefficient of kinetic triction along the ramp is 0.3. To move the crate up with constant speed, with what magnitude of force in newtons (N must the person push? QUESTION 11 A man puls a crate of mass 24 kg with a force of 56 N at an angle 30 with respect to the horizontal. Calculate the normal force on the crate, in the unit newton (N 30arrow_forward(d) A block of mass 110 kg rests on the floor. The value of the coefficient of static friction is 0.66 and value of the coefficient of kinetic friction is 0.42. Calculate the frictional force that exists between bottom of the block and the floor when a person tries to pull this block with the following forces given and comment on the results obtained: (i) 400 N (ii) 1000 Narrow_forward
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