A physics student in a hot air balloon ascends vertically at constant speed. Consider the following four forces present in this situation: 1= the weight of the hot air balloon 3= the force of the student pulling on the earth 2= the weight of the student 4= the force of the hot air balloon pulling on the student -Which one of the following relationships concerning the forces or their magnitudes is true?

A) F4 > F2 B) F1 2 C) F4 > F1 D) 2 = - 4 E) 3 = - 4 A) F4 > F2 B) F1 2 C) F4 > F1 D) 2 = - 4 E) 3 = - 4

Exam 4: Forces and Newtons Laws of Motion

An object moves due east at constant speed. A net force directed due north then acts on the object for 5.0 s. At the end of the 5.0-second period, the net force drops to zero newtons. Which one of the following statements is necessarily true?

(Multiple Choice)

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Question 81

Consider the following forces. (1) frictional (2) gravitational (3) tension (4) strong nuclear (5) normal (6) electroweak Which of the forces listed are considered fundamental forces?

(Multiple Choice)

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Question 82

A physics student in a hot air balloon ascends vertically at constant speed. Consider the following four forces present in this situation: 11ec874b_21ea_ddf1_a44c_811fc40246c2_TB34225555_11 1= the weight of the hot air balloon 11ec874b_21ea_ddf1_a44c_811fc40246c2_TB34225555_11 3= the force of the student pulling on the earth 11ec874b_21ea_ddf1_a44c_811fc40246c2_TB34225555_11 2= the weight of the student 11ec874b_21ea_ddf1_a44c_811fc40246c2_TB34225555_11 4= the force of the hot air balloon pulling on the student -Which one of the following relationships concerning the forces or their magnitudes is true?

(Multiple Choice)

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Question 83

A 975-kg car accelerates from rest to 26.7 m/s in a distance of 120 m. What is the magnitude of the average net force acting on the car?

(Multiple Choice)

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Question 84

A 2.0-N rock slides on a frictionless inclined plane. Which one of the following statements is true concerning the normal force that the plane exerts on the rock?

(Multiple Choice)

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Question 85

Two identical blocks are pulled along a rough surface as suggested in the figure. Which one of the following statements is false?

(Multiple Choice)

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Question 86

A massless horizontal strut is attached to the wall at the hinge O. Which one of the following phrases best describes the force that the hinge pin applies to the strut if the weight of the cables is also neglected?

(Multiple Choice)

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Question 87

A 20.0-kg package is dropped from a high tower in still air and is "tracked" by a radar system. When the package is 25 m above the ground, the radar tracking indicates that its acceleration is 7.0 m/s². Determine the force of air resistance on the package.

(Multiple Choice)

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Question 88

What is the weight of a 2.50-kg bag of sand on the surface of the earth?

(Multiple Choice)

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Question 89

Two blocks rest on a horizontal frictionless surface as shown. The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks. A 30-N force is applied to the bottom block as suggested in the figure. -What is the acceleration of the "two block" system?

(Multiple Choice)

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Question 90

A rock is suspended from a string and moves downward at constant speed. Which statement is true concerning the tension in the string if air resistance is ignored?

(Multiple Choice)

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Question 91

A block is at rest on a rough inclined plane and is connected to an object with the same mass as shown. The rope may be considered massless; and the pulley may be considered frictionless. The coefficient of static friction between the block and the plane is μs; and the coefficient of kinetic friction is μk. -If the mass of the suspended object is doubled, what will be the acceleration of the block up the plane?

(Multiple Choice)

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Question 92

A block of weight W is suspended by a string of fixed length. The ends of the string are held at various positions as shown in the figures below. In which case, if any, is the magnitude of the tension along the string the largest?

(Multiple Choice)

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Question 93

Complete the following statement: An inertial reference frame is one in which

(Multiple Choice)

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Question 94

Note the following situations: $Note the following situations: In which case will the magnitude of the normal force on the block be equal to (Mg + F sin \theta )?$ In which case will the magnitude of the normal force on the block be equal to (Mg + F sin $\theta$ )?

(Multiple Choice)

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Question 95

pulls on a crate of mass m that is in contact with a rough surface. The figure shows the magnitudes and directions of the forces that act on the crate in this situation. represents the weight of the crate. represents the normal force on the crate, and represents the frictional force. -Which statement best describes the motion of the crate?

(Multiple Choice)

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Question 96

A rock is thrown straight up from the earth's surface. Which one of the following statements concerning the net force acting on the rock at the top of its path is true?

(Multiple Choice)

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Question 97

What is the tension in the right-hand cable?

(Multiple Choice)

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Question 98

A muscle builder holds the ends of a massless rope. At the center of the rope, a 7.9-kg ball is hung as shown. What is the tension in the rope if the angle $\theta$ in the drawing is 6.0°? $A muscle builder holds the ends of a massless rope. At the center of the rope, a 7.9-kg ball is hung as shown. What is the tension in the rope if the angle \theta in the drawing is 6.0°?$

(Multiple Choice)

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Question 99

Two forces act on a hockey puck. For which orientation of the forces will the puck acquire an acceleration with the largest magnitude?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 103

Exam 4: Forces and Newtons Laws of Motion

An object moves due east at constant speed. A net force directed due north then acts on the object for 5.0 s. At the end of the 5.0-second period, the net force drops to zero newtons. Which one of the following statements is necessarily true?

Consider the following forces. (1) frictional (2) gravitational (3) tension (4) strong nuclear (5) normal (6) electroweak Which of the forces listed are considered fundamental forces?

A 975-kg car accelerates from rest to 26.7 m/s in a distance of 120 m. What is the magnitude of the average net force acting on the car?

A 2.0-N rock slides on a frictionless inclined plane. Which one of the following statements is true concerning the normal force that the plane exerts on the rock?

Two identical blocks are pulled along a rough surface as suggested in the figure. Which one of the following statements is false?

A massless horizontal strut is attached to the wall at the hinge O. Which one of the following phrases best describes the force that the hinge pin applies to the strut if the weight of the cables is also neglected?

A 20.0-kg package is dropped from a high tower in still air and is "tracked" by a radar system. When the package is 25 m above the ground, the radar tracking indicates that its acceleration is 7.0 m/s2. Determine the force of air resistance on the package.

What is the weight of a 2.50-kg bag of sand on the surface of the earth?

Two blocks rest on a horizontal frictionless surface as shown. The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks. A 30-N force is applied to the bottom block as suggested in the figure. -What is the acceleration of the "two block" system?

A rock is suspended from a string and moves downward at constant speed. Which statement is true concerning the tension in the string if air resistance is ignored?

A block of weight W is suspended by a string of fixed length. The ends of the string are held at various positions as shown in the figures below. In which case, if any, is the magnitude of the tension along the string the largest?

Complete the following statement: An inertial reference frame is one in which

Note the following situations: In which case will the magnitude of the normal force on the block be equal to (Mg + F sin θ\thetaθ )?

A rock is thrown straight up from the earth's surface. Which one of the following statements concerning the net force acting on the rock at the top of its path is true?

What is the tension in the right-hand cable?

A muscle builder holds the ends of a massless rope. At the center of the rope, a 7.9-kg ball is hung as shown. What is the tension in the rope if the angle θ\thetaθ in the drawing is 6.0°?

Two forces act on a hockey puck. For which orientation of the forces will the puck acquire an acceleration with the largest magnitude?

Introduction and Mathematical Concepts

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A 20.0-kg package is dropped from a high tower in still air and is "tracked" by a radar system. When the package is 25 m above the ground, the radar tracking indicates that its acceleration is 7.0 m/s². Determine the force of air resistance on the package.

Note the following situations: $Note the following situations: In which case will the magnitude of the normal force on the block be equal to (Mg + F sin \theta )?$ In which case will the magnitude of the normal force on the block be equal to (Mg + F sin $\theta$ )?