COLLEGE PHYSICS,V.1-W/ENH.WEBASSIGN
10th Edition
ISBN: 9781305411906
Author: SERWAY
Publisher: CENGAGE L
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Chapter 4, Problem 8WUE
A horizontal force of 95.0 N is applied to a 60.0.kg crate on a rough, level surface. If the crate accelerates at 1.20 m/s2, what is the magnitude of the
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Chapter 4 Solutions
COLLEGE PHYSICS,V.1-W/ENH.WEBASSIGN
Ch. 4.3 - Which of the following statements are true? (a) An...Ch. 4.3 - Which has greater value, a newton of gold on Earth...Ch. 4.3 - Respond to each statement, true or false: (a) No...Ch. 4.4 - A small sports car collides head-on with a massive...Ch. 4.5 - Consider the two situations shown in Figure 4.30,...Ch. 4.5 - For the woman being pulled forward on the toboggan...Ch. 4.6 - If you press a book flat against a vertical wall...Ch. 4.6 - A crate is sitting in the center of a flatbed...Ch. 4.6 - Suppose your friend is sitting on a sled and asks...Ch. 4 - Physics Review A hockey player strikes a puck,...
Ch. 4 - Four forces act on an object, given by A = 40.0 N...Ch. 4 - A force of 30.0 N is applied in the positive...Ch. 4 - What would be the acceleration of gravity at the...Ch. 4 - Two monkeys are holding onto a single vine of...Ch. 4 - Two identical strings making an angle of = 30.0...Ch. 4 - Calculate the normal force on a 15.0 kg block in...Ch. 4 - A horizontal force of 95.0 N is applied to a...Ch. 4 - Prob. 9WUECh. 4 - A block of mass 12.0 kg is sliding at an initial...Ch. 4 - A man exerts a horizontal force of 112 N on a...Ch. 4 - An Atwoods machine (Fig. 4.38) consists of two...Ch. 4 - A block of mass m1= 10 kg is on a frictionless...Ch. 4 - A passenger sitting in the rear of a bus claims...Ch. 4 - A space explorer is moving through space far from...Ch. 4 - (a) If gold were sold by weight, would you rather...Ch. 4 - If you push on a heavy box that is at rest, you...Ch. 4 - A ball is held in a persons hand. (a) Identify all...Ch. 4 - A weight lifter stands on a bathroom scale. (a) As...Ch. 4 - (a) What force causes an automobile to move? (b) A...Ch. 4 - If only one force acts on an object, can it be in...Ch. 4 - In the: motion picture It Happened One Night...Ch. 4 - Analyze the motion of a rock dropped in water in...Ch. 4 - Identify the action-reaction pairs in the...Ch. 4 - Draw a free-body diagram for each of the following...Ch. 4 - In a tug-of-war between two athletes, each pulls...Ch. 4 - Suppose you are driving a car at a high speed. Why...Ch. 4 - As a block slides down a frictionless incline,...Ch. 4 - A crate remains stationary after it has been...Ch. 4 - In Figure 4.4, a locomotive has broken through the...Ch. 4 - If an object is in equilibrium, which of the...Ch. 4 - A truck loaded with sand accelerates along a...Ch. 4 - A large crate of mass m is placed on the back of a...Ch. 4 - Which of the following statements are true? (a) An...Ch. 4 - The heaviest invertebrate is the giant squid,...Ch. 4 - A football punter accelerates a football from rest...Ch. 4 - A 6.0-kg object undergoes an acceleration of 2.0...Ch. 4 - One or more external forces are exerted on each...Ch. 4 - A bag of sugar weighs 5.00 lb on Earth. What would...Ch. 4 - A freight train has a mass of 1.5 107 kg. If the...Ch. 4 - A 75-kg man standing on a scale in an elevator...Ch. 4 - Consider a solid metal sphere (S) a few...Ch. 4 - As a fish jumps vertically out of the water,...Ch. 4 - A 5.0-g bullet leaves the muzzle of a rifle with a...Ch. 4 - A boat moves through the water with two forces...Ch. 4 - Two forces are applied to a car in an effort to...Ch. 4 - A 970.-kg car starts from rest on a horizontal...Ch. 4 - An object of mass m is dropped from the roof of a...Ch. 4 - After falling from rest from a height of 30.0 m, a...Ch. 4 - The force exerted by the wind on the sails of a...Ch. 4 - (a) Find the tension in each cable supporting the...Ch. 4 - A certain orthodontist uses a wire brace to align...Ch. 4 - A 150-N bird feeder is supported by three cables...Ch. 4 - The leg and cast in Figure P4.40 weigh 220 N (w1)....Ch. 4 - Two blocks each of mass m are fastened to the top...Ch. 4 - Two blocks each of mass m = 3.50 kg are fastened...Ch. 4 - The distance between two telephone poles is 50.0...Ch. 4 - The systems shown in Figure P4.58 are in...Ch. 4 - A 5.0-kg bucket of water is raised from a well by...Ch. 4 - A crate of mass m = 32 kg rides on the bed of a...Ch. 4 - Two blocks of masses m and 2m are held in...Ch. 4 - Two packing crates of masses 10.0 kg and 5.00 kg...Ch. 4 - Assume the three blocks portrayed in Figure P4.59...Ch. 4 - A block of mass m = 5.8 kg is pulled up a = 25...Ch. 4 - A setup similar to the one shown in Figure P4.53...Ch. 4 - Two blocks of masses m1 and m2 (m1 m2) are placed...Ch. 4 - A 276-kg glider is being pulled by a 1 950-kg jet...Ch. 4 - In Figure P4.63, the light, taut, unstretchable...Ch. 4 - (a) An elevator of mass m moving upward has two...Ch. 4 - An object with mass m1 = 5.00 kg rests on a...Ch. 4 - A 1.00 103 car is pulling a 300.-kg trailer....Ch. 4 - Two objects with masses of 3.00 kg and 5.00 kg are...Ch. 4 - A dockworker loading crates on a ship finds that a...Ch. 4 - In Figure P4.64, m1 = 10. kg and m2 = 4.0 kg. The...Ch. 4 - A 1.00 103-N crate is being pushed across a level...Ch. 4 - A block of mass 3m is placed on a frictionless...Ch. 4 - Consider a large truck carrying a heavy load, such...Ch. 4 - A crate of mass 45.0 kg is being transported on...Ch. 4 - Objects with masses m1 = 10.0 kg and m2 = 5.00 kg...Ch. 4 - A hockey puck struck by a hockey stick is given an...Ch. 4 - The coefficient of static friction between the...Ch. 4 - A student decides to move a box of books into her...Ch. 4 - An object falling under the pull of gravity is...Ch. 4 - A car is traveling at 50.0 km/h on a flat highway....Ch. 4 - A 3.00-kg block starts from rest at the top of a...Ch. 4 - A 15.0-lb block rests on a horizontal floor, (a)...Ch. 4 - To meet a U.S. Postal Service requirement,...Ch. 4 - Objects of masses m1 = 4.00 kg and m2 = 9.00 kg...Ch. 4 - The person in Figure P4.49 weighs 170. lb. Each...Ch. 4 - As a protest against the umpires calls, a baseball...Ch. 4 - Three objects are connected on a table as shown in...Ch. 4 - The force exerted by the wind on a sailboat is...Ch. 4 - (a) What is the resultant force exerted by the two...Ch. 4 - (a) What is the minimum force of friction required...Ch. 4 - A boy coasts down a hill on a sled, reaching a...Ch. 4 - A woman at an airport is towing her 20.0-kg...Ch. 4 - A box rests on the back of a truck. The...Ch. 4 - Three objects are connected by light strings as...Ch. 4 - A frictionless plane is 10.0 m long and inclined...Ch. 4 - A high diver of mass 70.0 kg steps off a board...Ch. 4 - A 2.00-kg aluminum block and a 6.00-kg copper...Ch. 4 - An object of mass m1 hangs from a string that...Ch. 4 - Two boxes of fruit on a frictionless horizontal...Ch. 4 - Measuring coefficients of friction A coin is...Ch. 4 - A fisherman poles a boat as he searches for his...Ch. 4 - A rope with mass m, is attached to a block with...Ch. 4 - A car accelerates down a hill (Fig. P4.87), going...Ch. 4 - Prob. 74APCh. 4 - The parachute on a race car of weight 8 820 N...Ch. 4 - On an airplanes takeoff, the combined action of...Ch. 4 - The board sandwiched between two other boards in...Ch. 4 - A sled weighing 60.0 N is pulled horizontally...Ch. 4 - A 72-kg man stands on a spring scale in an...Ch. 4 - A magician pulls a tablecloth from under a 200-g...Ch. 4 - An inventive child wants to reach an apple in a...Ch. 4 - A fire helicopter carries a 620-kg bucket of water...Ch. 4 - A crate of weight Fg is pushed by a force P on a...Ch. 4 - In Figure P1.84, the pulleys and the cord are...Ch. 4 - What horizontal force must ho applied to a large...
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- A block of mass m = 5.8 kg is pulled up a = 25 incline as in Figure P4.24 with a force of magnitude F = 32 N. (a) Find the acceleration of the bloc k if the incline is frictionless. (b) Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.10. Figure P4.24arrow_forwardA 3.00-kg block starts from rest at the top of a 30.0 incline and slides a distance of 2.00 m down the incline in 1.50 s. Find (a) the magnitude of the acceleration of the block, (b) the coefficient of kinetic friction between block and plane, (c) the friction force acting on the block, and (d) the speed of the block after it has slid 2.00 m.arrow_forwardA block of mass m = 5.8 kg is pulled up a = 25 incline as in Figure P4.24 with a force of magnitude F = 32 N. (a) Find the acceleration of the bloc k if the incline is frictionless. (b) Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.10. Figure P4.24arrow_forward
- The systems shown in Figure P4.22 are in equilibrium. If the spring scales are calibrated in newtons, what do they read? Ignore the masses of the pulleys and strings and assume the pulleys and the incline in Figure P4.22d are frictionless. Figure P4.22arrow_forwardA car accelerates down a hill (Fig. P5.95), going from rest to 30.0 m/s in 6.00 s. A toy inside the car hangs by a string from the car's ceiling. The ball in the figure represents the toy, of mass 0.100 kg. The acceleration is such that the string remains perpendicular to the ceiling. Determine (a) the angle 0 and (b) the tension in the string.arrow_forwardA certain orthodontist uses a wire brace to align a patients crooked tooth as in Figure P4.88. The tension in the wire is adjusted to have a magnitude of 18.0 N. Find the magnitude of the net force exerted by the wire on the crooked tooth. Figure P4.38arrow_forward
- The manager of a department store is pushing horizontally with a force of magnitude 200 N on a box of shirts. The box is sliding across the horizontal floor with a forward acceleration. Nothing else touches the box. What must be true about the magnitude of the force of kinetic friction acting on the box (choose one)? (a) It is greater than 200 N. (b) It is less than 200 N. (c) It is equal to 200 N. (d) None of those statements is necessarily true.arrow_forwardTwo objects, m1 = 3.00 kg and m2 = 8.50 kg, are attached by a massless cord passing over a frictionless pulley as shown in Figure P5.51. Assume the horizontal surface is frictionless. a. Draw a free-body diagram for each of the two objects. b. What is the tension in the cord? c. What is the magnitude of the acceleration of the two objects? FIGURE P5.51 Problems 51 and 65.arrow_forwardThe coefficient of static friction between the 3.00-kg crate and the 35.0 incline of Figure P4.31 is 0.300. What minimum force F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline? Figure P4.31arrow_forward
- A crate of weight Fg is pushed by a force P on a horizontal floor as shown in Figure P4.83. 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 (b) Find the condition on in terms of , for which motion of the crate is impossible for any value of P. Figure P4.83arrow_forwardA nurse pushes a cart by exerting a force on the handle at a downward angle 35.0° below the horizontal. The loaded cart has a mass of 28.0 kg, and the force of friction is 60.0 N. (a) Draw a free-body diagram for the system of interest. (b) What force must the nurse exert to move at a constant velocity?arrow_forwardTwo blocks connected by a rope of negligible mass are being dragged by a horizontal force (Fig. P5.13). Suppose F = 68.0 N, m1 = 12.0 kg, m2 = 18.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.100. (a) Draw a free-body diagram for each block. Determine (b) the acceleration of the system and (c) the tension T in the rope. Figure P5.13arrow_forward
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