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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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Three forces, Three forces, , ,and ,act on a mass of 4.2 kg.The forces are The magnitude of the net acceleration of the mass is A) 2.9 m/s<sup>2 </sup> B) 5.3 m/s<sup>2 </sup> C) 1.4 m/s<sup>2 </sup> D) 0.0 m/s<sup>2 </sup> E) 18 m/s<sup>2 </sup> , Three forces, , ,and ,act on a mass of 4.2 kg.The forces are The magnitude of the net acceleration of the mass is A) 2.9 m/s<sup>2 </sup> B) 5.3 m/s<sup>2 </sup> C) 1.4 m/s<sup>2 </sup> D) 0.0 m/s<sup>2 </sup> E) 18 m/s<sup>2 </sup> ,and Three forces, , ,and ,act on a mass of 4.2 kg.The forces are The magnitude of the net acceleration of the mass is A) 2.9 m/s<sup>2 </sup> B) 5.3 m/s<sup>2 </sup> C) 1.4 m/s<sup>2 </sup> D) 0.0 m/s<sup>2 </sup> E) 18 m/s<sup>2 </sup> ,act on a mass of 4.2 kg.The forces are Three forces, , ,and ,act on a mass of 4.2 kg.The forces are The magnitude of the net acceleration of the mass is A) 2.9 m/s<sup>2 </sup> B) 5.3 m/s<sup>2 </sup> C) 1.4 m/s<sup>2 </sup> D) 0.0 m/s<sup>2 </sup> E) 18 m/s<sup>2 </sup> The magnitude of the net acceleration of the mass is


A) 2.9 m/s2
B) 5.3 m/s2
C) 1.4 m/s2
D) 0.0 m/s2
E) 18 m/s2

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In the cgs system,the units of force are


A) g · cm
B) g · cm2/s2
C) g · cm/s2
D) g · s/cm
E) cm · s2

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If a force F is required to extend a spring a distance 5y,how far will it be extended by force 3F?


A) 5y
B) (3/5) y
C) (5/3) y
D) 15y
E) (3/8) y

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A net force is exerted toward the east on an object that is initially at rest.In which direction does the object start to move?


A) north
B) east
C) west
D) south
E) It may start to move in any of these directions.

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A force of 3.0 N acts on a body along a direction 30º above the horizontal.In addition,there is a gravitational force of 4.0 N downward.The resultant force has a magnitude of


A) 7.0 N
B) 6.8 N
C) 6.1 N
D) 3.6 N
E) 5.0 N

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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 .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is A) B) C) D) E) and A ball of mass 2.0 kg is acted on by two forces, and .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is A) B) C) D) E) .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is


A) A ball of mass 2.0 kg is acted on by two forces, and .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is A) B) C) D) E)
B) A ball of mass 2.0 kg is acted on by two forces, and .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is A) B) C) D) E)
C) A ball of mass 2.0 kg is acted on by two forces, and .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is A) B) C) D) E)
D) A ball of mass 2.0 kg is acted on by two forces, and .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is A) B) C) D) E)
E) A ball of mass 2.0 kg is acted on by two forces, and .At t = 0 s,the particle is at rest at the origin.The velocity vector at t = 2 s is A) B) C) D) E)

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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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Two tug-of-war teams are pulling on the ends of a rope,each team with a force of 1000 N.If the rope does not move,the tension in the rope is


A) 2000 N
B) 500 N
C) 1000 N
D) 0 N
E) 2000 kg

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A body moves with constant speed in a straight line.Which of the following statements must be true?


A) No force acts on the body.
B) A single constant force acts on the body in the direction of motion.
C) A single constant force acts on the body in the direction opposite to the motion.
D) A net force of zero acts on the body.
E) A constant net force acts on the body in the direction of motion.

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A vertical rope is attached to an object that has a mass of 40.0 kg and is at rest.The tension in the rope needed to give the object an upward speed of 3.50 m/s in 0.700 s is


A) 592 N
B) 390 N
C) 200 N
D) 980 N
E) 720 N

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Two masses m1 and m2 (with m2 > m1) are connected by a massless rope hung over a frictionless light pulley.If the masses are released then the acceleration of m2 in the downward direction is given by Two masses m<sub>1</sub> and m<sub>2</sub> (with m<sub>2</sub> > m<sub>1</sub>) are connected by a massless rope hung over a frictionless light pulley.If the masses are released then the acceleration of m<sub>2</sub> in the downward direction is given by A) (m<sub>2</sub> - m<sub>1</sub>) \times g/(m<sub>1</sub> - m<sub>2</sub>) B) (m<sub>2</sub> - m<sub>1</sub>) \times g/(m<sub>1</sub> + m<sub>2</sub>) C) (m<sub>1</sub> + m<sub>2</sub>) \times g/(m<sub>2</sub> - m<sub>1</sub>) D) m<sub>2</sub> \times g/(m<sub>1</sub> + m<sub>2</sub>) E) g


A) (m2 - m1) ×\times g/(m1 - m2)
B) (m2 - m1) ×\times g/(m1 + m2)
C) (m1 + m2) ×\times g/(m2 - m1)
D) m2 ×\times g/(m1 + m2)
E) g

Correct Answer

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Which of the following is a unit of force?


A) m2/s2
B) kg · s2/m
C) kg · m/s2
D) N · s
E) N/kg

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A cricket batsman hits a ball with a bat.If the force with which the bat hits the ball is considered the action force,what is the reaction force?


A) the force the bat exerts on the batsman's hands
B) the force on the ball exerted by the hand of the person who catches it
C) the force the ball exerts on the bat
D) the force the bowler exerts on the ball in throwing it
E) friction as the ball rolls to a stop

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Spiral springs A and B are identical.When a weight of 12 N is fastened to the hook on A,the hook is lowered 2 cm.If a weight of 18 N is fastened to the hook on B,that hook is lowered


A) 8 cm
B) 6 cm
C) 3 cm
D) 4 cm
E) 5 cm

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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 acceleration vector of the mass is (in m/s<sup>2</sup>) A) B) C) D) E) and A ball of mass 2.0 kg is acted on by two forces, and .The acceleration vector of the mass is (in m/s<sup>2</sup>) A) B) C) D) E) .The acceleration vector of the mass is (in m/s2)


A) A ball of mass 2.0 kg is acted on by two forces, and .The acceleration vector of the mass is (in m/s<sup>2</sup>) A) B) C) D) E)
B) A ball of mass 2.0 kg is acted on by two forces, and .The acceleration vector of the mass is (in m/s<sup>2</sup>) A) B) C) D) E)
C) A ball of mass 2.0 kg is acted on by two forces, and .The acceleration vector of the mass is (in m/s<sup>2</sup>) A) B) C) D) E)
D) A ball of mass 2.0 kg is acted on by two forces, and .The acceleration vector of the mass is (in m/s<sup>2</sup>) A) B) C) D) E)
E) A ball of mass 2.0 kg is acted on by two forces, and .The acceleration vector of the mass is (in m/s<sup>2</sup>) A) B) C) D) E)

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A 6-kg block sitting on a smooth table is connected to a free-hanging 2-kg mass by a stretchless,massless cord that passes over a small frictionless pulley.The acceleration of the two-block system is


A) equal to g.
B) half of g.
C) one-third of g.
D) one-fourth of g.
E) two-thirds of g.

Correct Answer

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If a force F is required to extend a spring by 20 cm,what force is required to extend it by 30 cm?


A) F
B) (2/3) F
C) (3/2) F
D) 600F
E) (3/5) F

Correct Answer

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The acceleration due to gravity on the moon is only about 1/6 of that on Earth.An astronaut whose weight on Earth is 600 N travels to the lunar surface.His mass as measured on the moon is


A) 600 kg
B) 100 kg
C) 61.2 kg
D) 10.0 kg
E) 360 kg

Correct Answer

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An astronaut lands on an Earthlike planet and drops a small lead ball with a mass of 76.5 g from the top of her spaceship.The point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground.The astronaut's mass on Earth is 68.5 kg.Her weight on the planet is


A) 69.0 N
B) 395 N
C) 670 N
D) 990 N
E) 1.02 kN

Correct Answer

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