Please short answer. 1. It's page 94 exercise 13,13,14,152. It's page 100 exercise 22,23,24,25,26,27 3. Page 106 exercise 34,35,36,37,38 4. Page 121 exercise 11,12,13,14.
Check Your Progress 12. Forces Identify each of the following as either 14. Free-Body Diagram Draw a free-body a. b. or c: mass. inertia, the push of a hand, diagram of a water bucket being lifted by a friction, air resistance, spring force, gravity, rope at a decreasing speed. Specifically and acceleration. identify the system. Label all forces with their a. contact force agents and make the arrows the correct b. a field force lengths. c. not a force 15. Critical Thinking A force of 1 N is the only 13. Free-Body Diagram Draw a free-body horizontal force exerted on a block, and the diagram of a bag of sugar being lifted by your horizontal acceleration of the block is hand at an increasing speed. Specifically measured. When the same horizontal force is identify the system. Use subscripts to label all the only force exerted on a second block, the forces with their agents. Remember to make horizontal acceleration is three times as large. the arrows the correct lengths. What can you conclude about the masses of the two blocks? LEARNSMART' Go online to follow your personalized learning path to review, practice, and reinforce your understanding. Check Your Progress 22. Terminal Velocity The skydiver in Figure 13 25. Apparent Weight You take a ride in a fast elevator to the top of a tall building and ride falls at a constant speed in the spread-eagle back down. Compare your apparent and real position. Immediately after opening the parachute, is the skydiver accelerating? If so, weights at each part of the journey. Sketch in which direction? Explain your answer. free-body diagrams to support your answers. 26. Acceleration Tecle, with a mass of 65.0 kg, is Figure 13 standing on an ice-skating rink. His friend applies a force of 9.0 N to him. What is Tecle's resulting acceleration? 27. Critical Thinking You have a job loading Inventory onto trucks at a meat warehouse. 23. Lunar Gravity Compare the force holding a Each truck has a weight limit of 10,000 N of 10.0-kg rock on Earth and on the Moon. The cargo. You push each crate of meat along a gravitational field on the Moon is 1.6 N/kg. low-resistance roller belt to a scale and weigh 24. Motion of an Elevator You are riding in an it before moving it onto the truck. One night. elevator holding a spring scale with a 1-kg right after you weigh a 1000-N crate, the scale mass suspended from it. You look at the scale breaks. Describe a way in which you could and see that it reads 9.3 N. What does this tell apply Newton's laws to approximate the you about the elevator's motion? masses of the remaining crates. LEARNSMART' Go online to follow your personalized learning path to review, practice, and reinforce your understanding Check Your Progress 34. Interaction Pair Identify each force acting on 36. Tension A block hangs from the ceiling by a the ball and its interaction pair in Figure 20. massless rope. A second block is attached to the first block and hangs below it on another piece of massless rope. If each of the two blocks has a mass of 5.0 kg, what is the tension in the rope? 37. Tension A block hangs from the ceiling by a massless rope. A 3.0-kg block is attached to the first block and hangs below it on another piece of massless rope. The tension in the top rope is 63.0 N. Find the tension in the bottom Figure 20 rope and the mass of the top block. 35. Force Imagine lowering the ball in Figure 20 38. Critical Thinking A curtain prevents two at increasing speed. Draw separate free-body tug-of-war teams from seeing each other. One diagrams for the forces acting on the ball and team ties its end of the rope to a tree. If the for each set of interaction pairs. other team pulls with a 500-N force, what is the tension in the rope? Explain. LEARNSMART Go online to follow your personalized learning path to review, practice, and reinforce your understanding. Check Your Progress 11. Vectors Use Figure 9 for these questions. 13. Commutative Operations Vector addition is a. Find the components of vectors K, L, and M. commutative because the order in which b. Find the sum of the three vectors. vectors are added does not matter. c. Subtract vector K from vector L. a. Use the vectors from Figure 9 to show graphically that M + L = L + M. b. Are addition, subtraction, multiplication, and 5.0 division commutative? Give an example of each operation to support your conclusion. - 4.0 14. Critical Thinking You move a box through two unequal displacements. Could the displace- 6.0 ments have directions such that the resultant displacement is zero? Suppose you now move Figure 9 the box through three displacements of 12. Distance v. Displacement Are distance and unequal magnitude. Could the resultant dis- displacement always the same? Give an placement be zero? Support your conclusion example that supports your conclusion. with a diagram. LEARNSMART Go online to follow your personalized learning path to review, practice, and reinforce your understanding.Inclined Planes - This is a graphical method that can onlyr be used for adding two vectors. _ules: r Resolve the vectors at an angle into X and 3; components. r Add all the :1 components together In Add all the v components together r Use Pythagorean Theorem to nd the resultant (hypotenuse) r Resultant = vs\"? + 3&2 r Use trigonometric function to determine the direction: tanEl = opp f adj sample: 621% crate is resting on a plane inclined 30.0\" above the horizontal. Find components of the crate*s weight that are parallel and perpendicular to plane. - The angle from the positive a-asis to m the negative y-asis is 210. = 562\" Elm Correct angle = 270 - 30.0 = 240 :le = 30.0\" known t='? r='? rrect angle='?I :I= Fg (cos angle) C I \"mm\" at i' \".J Friction 0 Push your hand across your desktop and feel the force called friction opposing the motion. A frictional force acts when two surfaces touch. When you push a book across the desk. it experiences a type of friction Friction b that acts on moving objects. Pushing force Two types of friction C Kim, and it is exerted on one surface by another when the two surfaces rub against each other because one or both of them are moving. To understand the other kind of friction. imagine trying to push a heavy couch across the floor. You give it a push. but it does not move. a This force is Static friction, which is the force exerted on one surface by another when there is no motion between the two surfaces. Kineticfriction force Ekinetic = kaN The kinetic friction force is equal to the product of the coefficient of the kinetic friction and the normal force. Inclined Planes This is a graphical method that can only be used for adding two vectors. Rules: Resolve the vectors at an angle into x and y components. . Add all the x components together . Add all the y components together Use Pythagorean Theorem to find the resultant (hypotenuse) Resultant = Vx^2 + y^2 Use trigonometric function to determine the direction: tan0 = opp / adj xample: 562N crate is resting on a plane inclined 30.0 above the horizontal. Find e components of the crate's weight that are parallel and perpendicular to e plane. The angle from the positive x-axis to * X nown the negative y-axis is 270. g= 562N down Correct angle = 270 - 30.0 = 240 Fay gle = 30.0 nknown gx=? +X Fq gy= ? orrect angle=
