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Two boxes m1 and m2 are connected by a lightweight cord and sitting on a frictionless surface. A horizontal force of 66 N pulls on box m1 and then m2 is pulled along. If the acceleration of both boxes is 2.2 m/s2 and the mass of m1 is 12 kg, find the mass of m2.


A) 12 kg
B) 18 kg
C) 30 kg
D) 48 kg
E) 42 kg

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A force of F = 90 N is exerted on mass m1 as shown. Both m1 and m2 accelerate to the right at 3 m/s2 along the frictionless surface. The force F makes an angle of 25 degrees to the horizontal. Calculate the force that the horizontal surface exerts on mass m1. (m2 = 10 kg) A force of F = 90 N is exerted on mass m<sub>1</sub> as shown. Both m<sub>1</sub> and m<sub>2</sub> accelerate to the right at 3 m/s<sup>2</sup> along the frictionless surface. The force F makes an angle of 25 degrees to the horizontal. Calculate the force that the horizontal surface exerts on mass m<sub>1</sub>. (m<sub>2</sub> = 10 kg) A) 2.5 \times 10<sup>2</sup> N B) 1.5 \times 10<sup>2</sup> N C) 82 N D) 3.5 \times 10<sup>2</sup> N E) 2.1 \times 10<sup>2</sup> N


A) 2.5 ×\times 102 N
B) 1.5 ×\times 102 N
C) 82 N
D) 3.5 ×\times 102 N
E) 2.1 ×\times 102 N

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Of the following values, which is most nearly equal to the weight of a 1-kg body?


A) 1 N
B) 103 dynes
C) 2.2 lb
D) 0.454 lb
E) 2.2 N

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An inertial reference frame is one in which


A) Newton's first law describes the behavior of matter.
B) the law of inertia is not applicable.
C) there is a great deal of matter.
D) the object of interest is traveling in a circular path.
E) forces do not necessarily exist in pairs.

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The system in the figure consists of a steel ball attached by a cord to a large block of wood. If the system is dropped in a vacuum, the force in the cord is The system in the figure consists of a steel ball attached by a cord to a large block of wood. If the system is dropped in a vacuum, the force in the cord is A) zero. B) equal to the difference of the masses of B and W. C) equal to the difference of the weights of B and W. D) equal to the weight of B. E) equal to the sum of the weights of B and W.


A) zero.
B) equal to the difference of the masses of B and W.
C) equal to the difference of the weights of B and W.
D) equal to the weight of B.
E) equal to the sum of the weights of B and W.

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Three boxes are connected by stretchless strings and are pulled by a force as shown in the figure. Which string has to be the strongest so as not to break? A) A B) B C) C D) A, B, and C must be equally strong. E) A and B must be equally strong. Three boxes are connected by stretchless strings and are pulled by a force Three boxes are connected by stretchless strings and are pulled by a force as shown in the figure. Which string has to be the strongest so as not to break? A) A B) B C) C D) A, B, and C must be equally strong. E) A and B must be equally strong. as shown in the figure. Which string has to be the strongest so as not to break?


A) A
B) B
C) C
D) A, B, and C must be equally strong.
E) A and B must be equally strong.

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An object with a mass M = 250 g is on a plane inclined at 30º above the horizontal and is attached by a string to a mass m = 150 g. There is no friction and mass m hangs freely and is initially at rest. When mass m has descended a distance h = 10 cm, its speed will be


A) 35.0 cm/s
B) 7.00 cm/s
C) 140 cm/s
D) 110 cm/s
E) 70.0 cm/s

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Three boxes are connected by stretchless strings and are pulled by a force as shown in the figure. Which box has the greatest acceleration? A) A B) B C) C D) they all have the same acceleration E) the accelerations of B and C are greater than that of A Three boxes are connected by stretchless strings and are pulled by a force Three boxes are connected by stretchless strings and are pulled by a force as shown in the figure. Which box has the greatest acceleration? A) A B) B C) C D) they all have the same acceleration E) the accelerations of B and C are greater than that of A as shown in the figure. Which box has the greatest acceleration?


A) A
B) B
C) C
D) they all have the same acceleration
E) the accelerations of B and C are greater than that of A

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Which of the following is not a unit of mass?


A) pound
B) kilogram
C) gram
D) slug
E) milligram

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A horse exerts a force F on a cart, causing the cart to move with increasing speed. What force does the cart exert on the horse?


A) zero
B) F
C) greater than F
D) less than F
E) The force cannot be determined unless the acceleration is given.

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A large (15,000-kg) military helicopter lifts a 6000-kg truck straight up out of a danger zone with an acceleration of 4 m/s2. Calculate the tension in the lifting cable.


A) 3.5 ×\times 104 N
B) 8.3 ×\times 104 N
C) 2.1 ×\times 102 N
D) 5.9 ×\times 104 N
E) 2.4 ×\times 104 N

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A car is accelerating at a rate of 2.5 m/s2. A mass of 250 g is hanging from the ceiling on a string 1.2 m long. The angle that the string makes with the vertical is


A) 14.3º toward the back of the car.
B) 76º toward the back of the car.
C) 7º toward the front of the car.
D) 14.3º toward the front of the car.
E) 0º, or straight down.

Correct Answer

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A net force of 64 N acts on a mass of 16 kg. The resulting acceleration is


A) 16 m/s2
B) 0.51 m/s2
C) 64 m/s2
D) 9.0 m/s2
E) 4.0 m/s2

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A particle of mass 1.3 kg is sliding down a frictionless slope inclined at 30º to the horizontal. The acceleration of the particle down the slope is


A) 1.3 m/s2
B) 9.8 m/s2
C) 0.5 m/s2
D) 8.5 m/s2
E) 4.9 m/s2

Correct Answer

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A ball of mass 2.0 kg is acted on by two forces, A ball of mass 2.0 kg is acted on by two forces, and . The magnitude of the acceleration is A) 2.5 m/s<sup>2</sup> B) 3.9 m/s<sup>2</sup> C) 4.6 m/s<sup>2</sup> D) 5.1 m/s<sup>2</sup> E) 5.8 m/s<sup>2</sup> and A ball of mass 2.0 kg is acted on by two forces, and . The magnitude of the acceleration is A) 2.5 m/s<sup>2</sup> B) 3.9 m/s<sup>2</sup> C) 4.6 m/s<sup>2</sup> D) 5.1 m/s<sup>2</sup> E) 5.8 m/s<sup>2</sup> . The magnitude of the acceleration is


A) 2.5 m/s2
B) 3.9 m/s2
C) 4.6 m/s2
D) 5.1 m/s2
E) 5.8 m/s2

Correct Answer

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The word "normal," as it applies to forces, means


A) usual.
B) mean.
C) average.
D) perpendicular.
E) straight up, in the direction opposite to the force of gravity.

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What is the weight of a 50-kg boy on the moon, where the acceleration due to gravity is 1.6 m/s2?


A) 80 N
B) 100 N
C) 490 N
D) 50 N
E) 80 lb

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