rcelenotherated.A baseball bat striking a ball is an example of an action-reaction pair. If thebat exerts a 50.-newton force on the baseball, the ball exerts a 50.-newtonforce on the bat in the opposite direction. Each member of the action/reaction pair of forces acts on a different object; one force acts on the balland the other on the bat. If no other forces are present, the objects areaccelerated in opposite directions as long as the forces are applied.RevieWestiQuestionsAs mossdecrease intertla55. As the mass of an object on Earth's surfacedecreases, what happens to the inertia andweight of the object?(1) Inertia decreases, and weight decreases.(2) Inertia decreases, and weight remainsKule something proves this59. A cart is uniformly accelerating from rest.The net force acting on the cart is(1) decreasing(2) zero(3) constant but not zero(4) increasing60. An 8.0-kilogram block and a 2.0-kilogram blockrest on a horizontal frictionless surface. Whenhorizontal force F is applied to the 8.0-kilogramblock, it accelerates at 5.0 meters per second?east. If the same force was applied to the2.0-kilogram block, the magnitude of the block'sacceleration would bethe same.(3) Inertia increases, and weight decreases.(4) Inertia remains the same, and weightremains the same.56. Compared to the inertia of a 0.10-kilogram steelball, the inertia of a 0.20-kilogram Styrofoamball is(1) one-half as great(2) twice as great(3) the same(4) four times as great(1) 1.3 m/s?(2) 2.5 m/s?(3) 10. m/s?(4) 20. m/s?61. A 6-newton force and an 8-newton force act57. A ball rolls through a hollow semicirculartube lying flat on a horizontal tabletop. Onthe following diagram, draw a line with anarrowhead to represent the path of the ballafter emerging from the tube, as viewedfrom above.concurrently on a box located on a frictionlesshorizontal surface. Which top-view diagramshows the forces producing the smallestmagnitude of acceleration of the box?8N6N Top of boxTop of box8 N6 N(1)(3)6NTop of box8NTabletopTop of box8 N6 N58. The following graph shows the relationshipbetween the acceleration of an object and thenet force on the object.(2)(4)Acceleration vs. Force62. As the vector sum of all the forces acting on amoving object increases, the magnitude of theacceleration of the object6.2. 2(1) decreases(3) remains the same(2) increases1 23 40.Force (N)63. An unbalanced force of 10.0 newtons northacts on a 20.0-kilogram mass for 5.0 seconds.Calculate the acceleration of the mass.What is the mass of the object?(1) 1 kg(2) 2 kg(3) 0.5 kg (4) 0.2 kgTopic 2: Mechanics 41Acceleration (m/s? an object that has no unbalanced force aangles to the horizon is a vertical component. If air resistance is neglected,67. Which graph best represents the motion of64 Two horizontal forces are applied to a2.0-kilogram block on a frictionless, horizontalsurface, as shown in the following diagram.on it?independent.is known, thegravitationalsuperpositionFi=2.0 NF2 = 8.0 N2.0 kgFrictionless horizontal surfaceTimeTime(1)A ProjectAn object pabove EartIf air resistof the velovertical vevelocity irdue to grastraight athat hasdownwa(3)The acceleration of the block is(1) 5.0 m/s to the right(2) 5.0 m/s to the left(3) 3.0 m/s to the right(4) 3.0 m/s to the leftTimeTime(2)65. Which graph best represents the motion of anobject on which the net force is zero?(4)68. Four forces act on an object, as shown in thefollowing diagram.30. NWhetherhorizonis the saTimeTime(1)TimeTime40. N(2)(3)(4)66. The vector diagram below represents force Facting on point P.seen by30. Nat 1.00-If the object is moving with a constant velocity,what is the magnitude of force F?examp10.0 maboveForceWhich vector diagram represents the pairof concurrent forces that would produceequilibrium when added to force F?69. A 1.0-kilogram book rests on a horizontaltabletop. The magnitude of the force of thetabletop on the book is(1) 1.0 kg (2) 9.8 kg (3) 1.0 N70. In the following diagram, an inflated balloonreleased from rest moves horizontally withvelocity v.time athe saIn ad(4) 9.8 Nan el2-12E(1)(2)andballhoridro(3)(4)AirBalloonincrWhat is the most likely cause of this velocity?thefallTwo-Dimensional Motion and TrajectoriesThe motion of an object traveling in a two-dimensional plane can bedescribed by separating its motion into the horizontal (x) and vertical (1)components of its displacement, velocity, and acceleration. A componentparallel to the horizon is a horizontal component and a component at rightWvediinan example of two-dimensional motion is the motion of a cannonballprojected near the surface of Earth at an angle above the horizontal, 16gravity is the only unbalanced force acting on the cannonball, the verticalcomponent of the ball's motion is identical to that of a freely falling boand the horizontal component is uniform motion. Although the twomotions occur simultaneously, the two components of the motion are2 Topic 2: Mechanics

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55. As the mass of an object on Earth's surface decreases, what happens to the inertia and weight of the object? (1) Inertia decreases, and weight decreases. (2) Inertia decreases, and weight remains the same. (3) Inertia increases, and weight decreases. (4) Inertia remains the same, and weight remains the same. 5063

55. As the mass of an object on Earth's surface decreases, what happens to the inertia and weight of the object? (1) Inertia decreases, and weight decreases. (2) Inertia decreases, and weight remains the same. (3) Inertia increases, and weight decreases. (4) Inertia remains the same, and weight remains the same. 5063

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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2. Astronauts in space (aboard the International Space Station, for instance) are effectively weightless. Suppose an astronaut gently throws a tool to a companion. What type of path (a circle, parabola, straight line, zigzag etc.) will the tool follow? Once let go, which of the three laws is the tool explicitly obeying?
2. The International Space Station operates at an altitude of 350 km. When final construction is completed, it will have a weight (measured at the Earth's surface) of 4.22 x 106 N. What is its weight when in orbit?
1. What force is required to spin a 3 kg weight with speed 3 m/s using a rope of length 0.5 m? [m=meter, kg-kilogram, s=second; unit for force = Newton (N), 1 N = 1 kg m/s²].
1. Why is it difficult to push a stalled car from rest than to keep it in motion once it has started to run? 2. When you are inside a train, what do you experience when the vehicle starts to move? What do you do when a moving vehicle suddenly stops? Explain these experiences in terms of Law of Inertia.
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3. String tension is needed to keep a block of mass m moving on a smooth floor in a circular path of radius 'r'. The block makes a complete revolution in time t. (a) Derive an equation for the tension in the string. (b) Calculate the tension in the string if the mass of the block is 2 kg, the radial distance is 1 m, and each revolution takes 5 s.
Three masses are arranged on the surface of a pool table which is marked by a grid as follows: m1 4 kg at the origin, m2 7 kg at (0, 5) and m3 6 kg at (7, 0). What is the net gravitational force on m1 due to m2 and m3? G = 6.67 x 10-11 (Nm2/kg2)
5. An atwood's pulley system has a mass, m2 of 5.0 kg and a mass, m1 of 2.0 kg. What is the approximate magnitude of the acceleration of the masses? 4.2 m/s m2 b) 7.0 m/s c) 3.3 m/s d) 9.8 m/s I
5. A ball is thrown with an initial velocity of 8.5 m/s at an angle of 30.0⁰ from the horizontal. How long the ball is in flight? (assume g = 9.81 m/s²) 6. The planet A has a mass of 1.972-1024 kg and the planet B has a mass of 5.348-1024 kg. What is the distance between the planet A and planet B if the force of gravity between them is 2.111-1022 N?. (assume G = 6.670-10-¹¹ Nm²/kg²) 1770
27. A car resting on a level road acting on it: its weight (down) and the nor- mal force (up). Recall from Chapter 4 that the normal force is the support force, which is always perpendicular to the supporting sur- face. If the car makes a turn on a level road, the normal force is still straight up. Friction between the wheels and road is the only cen- tripetal force providing curved motion. Suppose the road is banked so the normal force has a component that provides cen- tripetal force as shown in the sketch. Do you think the road could be banked so that for a given speed and a given radius of curvature, a vehicle could make the turn without fric- tion? Explain. Normal Weight
1. A flat, unbanked curve on a highway has a radius of 195 m. If the coefficient of static friction between a car's tires and the road is 0.750, what is the fastest speed the car can drive around the curve without sliding?
22 1. The earth has a mass of 5.98 x 1024 kg and the moon has a mass of 7.35 × 10²2 kg. The distance from the centre of the moon to the centre of the earth is 3.84 x 10³ m. A rocket with a total mass of 1200 kg is 3.0 × 108 m from the centre of the earth and directly in between the earth and the moon. Find the net gravitational force on the rocket from the earth and moon. 2. A 500 kg satellite experiences a gravitational force of 3000 N, while moving in a circular orbit around the earth. a. Determine the radius of the circular orbit. Round to 2 significant figures. b. Determine the speed of the satellite. Round to 2 significant figures. c. Determine the period of the orbit. Round to 3 significant figures.