A mass of 25 kg is acted on by two forces: 1 is 15 N due east,and 2 is 10 N due north.The acceleration of the mass is

A) 0.72 m/s2,56.3º north of east. B) 0.20 m/s2,due east. C) 0.72 m/s2,33.7º north of east. D) 1.0 m/s2,33.7º north of east. E) 0.20 m/s2,56.3º north of east. A) 0.72 m/s2,56.3º north of east. B) 0.20 m/s2,due east. C) 0.72 m/s2,33.7º north of east. D) 1.0 m/s2,33.7º north of east. E) 0.20 m/s2,56.3º north of east.

Three forces F1,F2 and F3 act on an object.If F1 = 3N i + 5N j + 7N k,F2 = -5N i - 2N j -2N k,and the object is moving at constant velocity then the vector force F3 is

A) -2N i - 3N j - 5N k B) 2N i - 3N j - 5N k C) 2N i + 3N j - 5N k D) -8N i - 7N j - 9N k E) 8N i + 7 N j +9N k A) -2N i - 3N j - 5N k B) 2N i - 3N j - 5N k C) 2N i + 3N j - 5N k D) -8N i - 7N j - 9N k E) 8N i + 7 N j +9N k

Exam 4: Newtons Laws

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A boy sits in a tire that is attached to a rope that passes over a pulley fastened to the ceiling and then passes back down to the boy's hands.The weight of the boy plus the tire is W.The force with which the boy must pull on the free end of the rope to support his weight in the tire is

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Question 81

A boy holds a bird in his hand.The reaction force to the weight of the bird is the force of the:

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Question 82

A force F produces an acceleration a on an object of mass m.A force 3F is exerted on a second object,and an acceleration 8a results.What is the mass of the second object?

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Question 83

A fat cat,ever conscious of its weight,walks into an elevator and steps on a scale.The elevator begins to accelerate downward.While the elevator is accelerating,the scale reads

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Question 84

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

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Question 85

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

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Question 86

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

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Question 87

A 44.5-N weight is hung on a spring scale,and the scale is hung on a string.The string is lowered at a rate such that the entire assembly has a downward acceleration of 4.90 m/s².The scale reads

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Question 88

Two springs with different spring constants,k₁ and k₂,are connected as shown in the figure below. A force F is applied to one end.The force exerted by the wall on the spring is (take + to the right)

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Question 89

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

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Question 90

A lamp of mass m hangs from a spring scale that is attached to the ceiling of an elevator.When the elevator is stopped at the fortieth floor,the scale reads mg.What does it read as the elevator slows down to stop at the forty-fifth floor?

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Question 91

Which of the following statements is true?

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Question 92

A girl walks on a level floor in a straight line in the +x direction.Her foot exerts a force on the floor.The direction of the reaction force by the floor on her foot is in

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Question 93

A mass of 25 kg is acted on by two forces: ₁ is 15 N due east,and ₂ is 10 N due north.The acceleration of the mass is

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Question 94

An 80-kg man on ice skates pushes a 40-kg boy,also on skates,with a force of 100 N.The force exerted by the boy on the man is

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Question 95

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

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Question 96

You are going up in an elevator that is accelerating upwards on Earth.Suppose you were to do the same thing on Mars.Your weight on Mars will be ___ your weight on Earth.

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Question 97

The concept of a field

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Question 98

Three forces F₁,F₂ and F₃act on an object.If F₁ = 3N i + 5N j + 7N k,F₂ = -5N i - 2N j -2N k,and the object is moving at constant velocity then the vector force F₃ is

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Question 99

Three forces, , ,and ,act on a mass of 4.2 kg.The forces are The direction of the net acceleration

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Question 100

Showing 81 - 100 of 106

Exam 4: Newtons Laws

A boy sits in a tire that is attached to a rope that passes over a pulley fastened to the ceiling and then passes back down to the boy's hands.The weight of the boy plus the tire is W.The force with which the boy must pull on the free end of the rope to support his weight in the tire is

A boy holds a bird in his hand.The reaction force to the weight of the bird is the force of the:

A force F produces an acceleration a on an object of mass m.A force 3F is exerted on a second object,and an acceleration 8a results.What is the mass of the second object?

A fat cat,ever conscious of its weight,walks into an elevator and steps on a scale.The elevator begins to accelerate downward.While the elevator is accelerating,the scale reads

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

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

A 44.5-N weight is hung on a spring scale,and the scale is hung on a string.The string is lowered at a rate such that the entire assembly has a downward acceleration of 4.90 m/s2.The scale reads

Two springs with different spring constants,k1 and k2,are connected as shown in the figure below. A force F is applied to one end.The force exerted by the wall on the spring is (take + to the right)

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

A lamp of mass m hangs from a spring scale that is attached to the ceiling of an elevator.When the elevator is stopped at the fortieth floor,the scale reads mg.What does it read as the elevator slows down to stop at the forty-fifth floor?

Which of the following statements is true?

A girl walks on a level floor in a straight line in the +x direction.Her foot exerts a force on the floor.The direction of the reaction force by the floor on her foot is in

A mass of 25 kg is acted on by two forces: 1 is 15 N due east,and 2 is 10 N due north.The acceleration of the mass is

An 80-kg man on ice skates pushes a 40-kg boy,also on skates,with a force of 100 N.The force exerted by the boy on the man is

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

You are going up in an elevator that is accelerating upwards on Earth.Suppose you were to do the same thing on Mars.Your weight on Mars will be ___ your weight on Earth.

The concept of a field

Three forces F1,F2 and F3 act on an object.If F1 = 3N i + 5N j + 7N k,F2 = -5N i - 2N j -2N k,and the object is moving at constant velocity then the vector force F3 is

Three forces, , ,and ,act on a mass of 4.2 kg.The forces are The direction of the net acceleration

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Applications of Newtons Laws

Work and Energy

Conservation of Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Conservation of Angular Momentum

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

The Electric Field I: Discrete Charge Distributions

The Electric Field Ii: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

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Elementary Particles and the Beginning of the Universe

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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 44.5-N weight is hung on a spring scale,and the scale is hung on a string.The string is lowered at a rate such that the entire assembly has a downward acceleration of 4.90 m/s².The scale reads

Two springs with different spring constants,k₁ and k₂,are connected as shown in the figure below. A force F is applied to one end.The force exerted by the wall on the spring is (take + to the right)

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

A mass of 25 kg is acted on by two forces: ₁ is 15 N due east,and ₂ is 10 N due north.The acceleration of the mass is

Three forces F₁,F₂ and F₃act on an object.If F₁ = 3N i + 5N j + 7N k,F₂ = -5N i - 2N j -2N k,and the object is moving at constant velocity then the vector force F₃ is