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A very light ideal spring stretches by A very light ideal spring stretches by When it is used to hang a 135-N object.What is the weight of a piece of electronic equipment that would stretch the spring by If you hung the equipment using the spring? A) 289 N B) 63 N C) 176 N D) 405 N When it is used to hang a 135-N object.What is the weight of a piece of electronic equipment that would stretch the spring by A very light ideal spring stretches by When it is used to hang a 135-N object.What is the weight of a piece of electronic equipment that would stretch the spring by If you hung the equipment using the spring? A) 289 N B) 63 N C) 176 N D) 405 N If you hung the equipment using the spring?


A) 289 N
B) 63 N
C) 176 N
D) 405 N

E) A) and B)
F) A) and C)

Correct Answer

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A 10-kg sign is held by two ropes as shown in the figure.What is the tension on rope A? A 10-kg sign is held by two ropes as shown in the figure.What is the tension on rope A? A) 44 N B) 69 N C) 72 N D) 88 N E) 98 N


A) 44 N
B) 69 N
C) 72 N
D) 88 N
E) 98 N

F) A) and C)
G) B) and E)

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You are making a circular turn in your car on a horizontal road when you hit a big patch of ice,causing the force of friction between the tires and the road to become zero.While the car is on the ice,it


A) moves along a straight-line path away from the center of the circle.
B) moves along a straight-line path toward the center of the circle.
C) moves along a straight-line path in its original direction.
D) continues to follow a circular path,but with a radius larger than the original radius.
E) moves along a path that is neither straight nor circular.

F) None of the above
G) A) and B)

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A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction.What is the tension in each cable?


A) 231 N
B) 400 N
C) 800 N
D) 2560 N
E) 3920 N

F) B) and C)
G) D) and E)

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An object slides on a level floor.It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s2.What is the coefficient of kinetic friction between the object and the floor?


A) 0.24
B) 0.48
C) 0.12
D) It is impossible to determine without knowing the mass of the object.

E) A) and B)
F) B) and D)

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An object moves with a constant speed of 30 m/s on a circular track of radius 150 m.What is the acceleration of the object?


A) 0 m/s2
B) 0.17 m/s2
C) 5.0 m/s2
D) 6.0 m/s2

E) A) and B)
F) A) and C)

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An ornament of mass 40.0 g is attached to a vertical ideal spring with a force constant (spring constant) of 20.0 N/m.The ornament is then lowered very slowly until the spring stops stretching.How much does the spring stretch?


A) 0.00200 m
B) 0.0196 m
C) 0.0816 m
D) 0.800 m
E) 0.200 m

F) B) and E)
G) A) and B)

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The Moon is accelerated toward the earth,so it is gradually getting closer to the earth.

A) True
B) False

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A driver in a A driver in a Car traveling at Slams on the brakes and skids to a stop.If the coefficient of friction between the tires and the level road is 0.80,how long will the skid marks be? A) 37 m B) 30 m C) 46 m D) 34 m Car traveling at A driver in a Car traveling at Slams on the brakes and skids to a stop.If the coefficient of friction between the tires and the level road is 0.80,how long will the skid marks be? A) 37 m B) 30 m C) 46 m D) 34 m Slams on the brakes and skids to a stop.If the coefficient of friction between the tires and the level road is 0.80,how long will the skid marks be?


A) 37 m
B) 30 m
C) 46 m
D) 34 m

E) None of the above
F) B) and D)

Correct Answer

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A 1000-kg barge is being towed by means of two horizontal cables.One cable is pulling with a force of 80.0 N in a direction 30.0° west of north.In what direction should the second cable pull so that the barge will accelerate northward,if the force exerted by the cable is 120 N? Assume that the water exerts no appreciable frictional drag on the barge.


A) 19.5° east of north
B) 21.1° east of north
C) 39.0° east of north
D) 47.5° east of north
E) 54.7° east of north

F) None of the above
G) A) and B)

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A push of magnitude P acts on a box of weight W as shown in the figure.The push is directed at an angle θ below the horizontal,and the box remains a rest.The box rests on a horizontal surface that has some friction with the box.The friction force on the box due to the floor is equal to A push of magnitude P acts on a box of weight W as shown in the figure.The push is directed at an angle θ below the horizontal,and the box remains a rest.The box rests on a horizontal surface that has some friction with the box.The friction force on the box due to the floor is equal to A) P sin θ. B) P cos θ. C) 0. D) P cos θ + W. E) P + W.


A) P sin θ.
B) P cos θ.
C) 0.
D) P cos θ + W.
E) P + W.

F) A) and E)
G) A) and D)

Correct Answer

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A 50.0-kg crate is being pulled along a horizontal smooth surface.The pulling force is 10.0 N and is directed 20.0° above the horizontal.What is the magnitude of the acceleration of the crate?


A) 0.0684 m/s2
B) 0.188 m/s2
C) 0.200 m/s2
D) 0.376 m/s2
E) 0.0728 m/s2

F) All of the above
G) A) and D)

Correct Answer

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Two boxes are connected to each other by a string as shown in the figure.The 10-N box slides without friction on the horizontal table surface.The pulley is ideal and the string has negligible mass.What is true about the tension T in the string? Two boxes are connected to each other by a string as shown in the figure.The 10-N box slides without friction on the horizontal table surface.The pulley is ideal and the string has negligible mass.What is true about the tension T in the string? A) T = 10 N B) T = 20 N C) T = 30 N D) T < 30 N E) T > 30 N


A) T = 10 N
B) T = 20 N
C) T = 30 N
D) T < 30 N
E) T > 30 N

F) D) and E)
G) A) and B)

Correct Answer

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A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the horizontal.What must be true about force of static friction f on the block?


A) f > mg
B) f > mg cos θ
C) f > mg sin θ
D) f = mg cos θ
E) f = mg sin θ

F) B) and C)
G) All of the above

Correct Answer

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A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation.What is the acceleration of that point due to the spin of the wheel?


A) 0.050 m/s2
B) 1.4 m/s2
C) 48 m/s2
D) 200 m/s2
E) 0.00 m/s2

F) D) and E)
G) A) and D)

Correct Answer

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In the figure,what does the spring scale read? The pulleys are ideal and the strings and scale are also massless. In the figure,what does the spring scale read? The pulleys are ideal and the strings and scale are also massless. A) exactly 2.0 N. B) exactly 1.0 N C) 0.50 N D) 0.00 N E) more than 19.6 N


A) exactly 2.0 N.
B) exactly 1.0 N
C) 0.50 N
D) 0.00 N
E) more than 19.6 N

F) D) and E)
G) C) and E)

Correct Answer

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Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord.The mass of P is greater than that of Q.A horizontal force Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord.The mass of P is greater than that of Q.A horizontal force Is applied to box Q as shown in the figure,accelerating the bodies to the right.The magnitude of the force exerted by the connecting cord on body P is A) zero. B) less than F but not zero. C) equal to F. D) greater than F. Is applied to box Q as shown in the figure,accelerating the bodies to the right.The magnitude of the force exerted by the connecting cord on body P is Two boxes P and Q on a perfectly smooth horizontal surface are connected by a light horizontal cord.The mass of P is greater than that of Q.A horizontal force Is applied to box Q as shown in the figure,accelerating the bodies to the right.The magnitude of the force exerted by the connecting cord on body P is A) zero. B) less than F but not zero. C) equal to F. D) greater than F.


A) zero.
B) less than F but not zero.
C) equal to F.
D) greater than F.

E) A) and D)
F) None of the above

Correct Answer

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Two objects have masses m and 5m,respectively.They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance.Which one of the following statements about these objects is correct?


A) It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier.
B) It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier.
C) It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter.
D) It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter.
E) The two objects reach the bottom of the ramp at exactly the same time.

F) D) and E)
G) A) and B)

Correct Answer

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A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal.It is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block,as shown in the figure.The string pulls on the 15-kg block parallel to the surface of the ramp.Find the magnitude of the acceleration of the 19-kg block after the system is gently released? A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal.It is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block,as shown in the figure.The string pulls on the 15-kg block parallel to the surface of the ramp.Find the magnitude of the acceleration of the 19-kg block after the system is gently released? A) 4.0 m/s<sup>2</sup> B) 3.8 m/s<sup>2</sup> C) 4.2 m/s<sup>2</sup> D) 4.5 m/s<sup>2</sup>


A) 4.0 m/s2
B) 3.8 m/s2
C) 4.2 m/s2
D) 4.5 m/s2

E) None of the above
F) C) and D)

Correct Answer

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A horizontal 52-N force is needed to slide a A horizontal 52-N force is needed to slide a Box across a flat surface at a constant velocity of 3.5 m/s.What is the coefficient of kinetic friction between the box and the floor? A) 0.11 B) 0.09 C) 0.10 D) 0.13 Box across a flat surface at a constant velocity of 3.5 m/s.What is the coefficient of kinetic friction between the box and the floor?


A) 0.11
B) 0.09
C) 0.10
D) 0.13

E) B) and C)
F) A) and D)

Correct Answer

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