Modified Mastering Physics without Pearson eText-- Instant Access -- for Physics for Scientists & Engineers with Modern Physics
5th Edition
ISBN: 9780134402659
Author: GIANCOLI, Douglas
Publisher: PEARSON
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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.
(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)
A block of mass m =
1 kg is found
on an inclined plane that makes an
angle 30° with the horizontal. The
coefficient of static friction and coef-
ficient of kinetic friction between the
block and the incline are: 71, = 0.6
and p, 0.5. Take the positive di
rection to be up the inclined plane
130°
With the block initially at ret, the acceleration of the block is
Chapter 4 Solutions
Modified Mastering Physics without Pearson eText-- Instant Access -- for Physics for Scientists & Engineers with Modern Physics
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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- Two 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_forwardI'm trying to find out number 17arrow_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
- 13–35. The coefficient of static friction between the 200-kg crate and the flat bed of the truck is µ, = 0.3. Determine the shortest time for the truck to reach a speed of 60 km/h, starting from rest with constant acceleration, so that the crate does not slip.arrow_forward(c) The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.25 with the floor. If the train is initially moving at a speed of 48 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide over the floor?arrow_forward(2) uhai block is resting (Kg mass 10) on a rough horizontal surface for which the coefficient of friction is (u=0.30). Determine the force P applied to the *.block 3 P 0=30°arrow_forward
- 6 m D 3m 4 'm 4 m 4 m 6 m `3 m 3 m 4 m Determine the tension developed in the three cables required to support the traffic light, which has a mass of 20 kg. Take h=3.5 m.arrow_forwardA 25kg wooden plate is held in place by two strings attached to the ceiling and the wall. The string attached to the ceiling makes an angle 40o with the horizontal and the string attached to the wall makes 90o with the wall. Determine the force in each string.arrow_forwardHow much is the total force acting on a point experiencing forces from A=50N: 10° N of W. B=75N; S and C=100N; 45°.arrow_forward
- Logs weighing 1.3 kg and 2.2 kg lie on a flat surface and are connected by a rope that breaks at a force of 20 N. The coefficient of friction between the lighter log and the base is 0.50, and between the heavier log and the base 0.30. With what maximum force can we pull the lighter log so that the string does not break?arrow_forward(ex) Two masses, pulley, incline with friction, static vs. kinetic friction: The two blocks shown below are connected by a light string over a massless frictionless pulley. The coefficient of static friction between each block and surface is 0.35, and the coefficient of kinetic friction is 0.20. The mass of block A is 10.0 kg, and the mass of block B is unknown. The angle of the incline is 30 degrees. Do everything in symbols first substitute numbers in only at the end. (See PSL 5.5,7,8,9) a) The blocks are released from rest, and they are on the verge of sliding, but they do not move. Draw FBDs for each block. b) In symbols, solve for the mass of block B. (What else could you solve for?) c) Substitute the numbers to determine the mass of block B. A 0 Barrow_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
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