Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, m1, has a mass of 7.0 kg and the other mass, m2, has a mass of 3.0 kg. The pulley turns on a shaft through the center of the pulley, which supports the pulley and all the masses. The vertical force of the shaft on the pulley is

A) 49 N upward. B) 49 N downward. C) 82 N upward. D) 82 N downward. E) 98 N upward. A) 49 N upward. B) 49 N downward. C) 82 N upward. D) 82 N downward. E) 98 N upward.

The gravitational field at the Moon due to the Earth is approximately (G = 6.67 × 10-11 N m2/kg2, the mass of the Earth is 5.98 × 1024 kg, and the distance to the Moon is 3.85 × 108 m)

A) 2.69 × 10-3 N/kg toward the Earth. B) 2.69 × 10-3 N/kg away from the Earth. C) 7.30 × 10-3 N/kg away from the Earth. D) 7.30 × 10-3 N/kg toward the Earth. E) 5.00 × 10-3 N/kg toward the Earth. A) 2.69 × 10-3 N/kg toward the Earth. B) 2.69 × 10-3 N/kg away from the Earth. C) 7.30 × 10-3 N/kg away from the Earth. D) 7.30 × 10-3 N/kg toward the Earth. E) 5.00 × 10-3 N/kg toward the Earth.

A tractor T is pulling two trailers, M1 and M2, with a constant acceleration. T has a mass of 200 kg, M1 has a mass of 100 kg, and M2 has a mass of 150 kg. If the forward acceleration is 0.60 m/s2, then the horizontal force on the tractor due to the ground is (ignore air resistance)

A) 270 N backward. B) 270 N forward. C) 150 N backward. D) 150 N forward. E) 90 N forward. A) 270 N backward. B) 270 N forward. C) 150 N backward. D) 150 N forward. E) 90 N forward.

A) is a contact force that acts parallel to the contact surfaces. B) is a normal force between contact surfaces. C) is a scalar quantity since it can act in any direction along a surface. D) does not depend on the nature of the surfaces. A) is a contact force that acts parallel to the contact surfaces. B) is a normal force between contact surfaces. C) is a scalar quantity since it can act in any direction along a surface. D) does not depend on the nature of the surfaces.

In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, M1, M2, and M3 with an acceleration of 1.0 m/s2. If T = 300 kg, M1 = 200 kg, M2 = 100 kg, and M3 = 100 kg, and air resistance is negligible, then the tension in the connection between cart M2 and cart M3 is

A) 700 N. B) 400 N. C) 200 N. D) 100 N. E) 0 N. A) 700 N. B) 400 N. C) 200 N. D) 100 N. E) 0 N.

Exam 4: Force and Newtons Laws of Motion

A 750 N box rests on the floor. The coefficient of static friction between the box and the floor is 0.800, and the coefficient of kinetic friction is 0.600. If a horizontal force of 550 N is applied to the box, what will be the magnitude of the force of friction on the box due to the floor?

(Multiple Choice)

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Question 101

An object travels 7.5 m/s toward the west. Under the influence of a constant net force of 5.2 kN, after 4.3 s, it is travelling 2.5 m/s toward the east. What is its mass?

(Multiple Choice)

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Question 102

What is the gravitational force between two 5.00 kg masses that are 10.0 cm apart from center to center? (G = 6.67 × 10^-11 N m²/kg²)

(Multiple Choice)

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Question 103

A 92.5 kg stunt man stands on a piston that will launch him out of a vertical tube. The piston applies a constant force F to the man's feet. Starting from rest, the force is applied for 1.20 s, and during that time interval, the man attains a velocity of 25.5 m/s. What was the man's apparent weight during this time interval?

(Multiple Choice)

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Question 104

A tractor T is pulling a trailer M with a constant velocity. If the velocity is 20 m/s and M = 200 kg and T = 500 kg, then the force on the trailer due to the tractor is (assume there is no friction or air resistance)

(Multiple Choice)

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Question 105

Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, m₁, has a mass of 7.0 kg and the other mass, m₂, has a mass of 3.0 kg. The pulley turns on a shaft through the center of the pulley, which supports the pulley and all the masses. The vertical force of the shaft on the pulley is

(Multiple Choice)

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Question 106

A car is driving on a level highway. It is acted upon by the following forces: a downward gravitational force of 12 kN, an upward contact force due to the road of 12 kN, another contact force due to the road of 7 kN directed West, and a drag force due to air resistance of 5 kN directed East. What is the net force acting on the car?

(Multiple Choice)

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Question 107

The highest spot on Earth is Mt. Everest, which is 8850 m above sea level. If the radius of the Earth (to sea level) is 6370 km, how much does the magnitude of g change between sea level and the top of Mt. Everest? (G = 6.67 × 10^-11 N m²/kg²_,and the mass of the Earth is 5.98 × 10²⁴ kg.)

(Multiple Choice)

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Question 108

One person holds a spring scale while another pulls until the scale reads 32 N. What is the force that the person holding the scale applies?

(Multiple Choice)

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Question 109

The gravitational field at the Moon due to the Earth is approximately (G = 6.67 × 10^-11 N m²/kg², the mass of the Earth is 5.98 × 10²⁴ kg, and the distance to the Moon is 3.85 × 10⁸ m)

(Multiple Choice)

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Question 110

A tractor T is pulling two trailers, M₁ and M₂, with a constant acceleration. T has a mass of 200 kg, M₁ has a mass of 100 kg, and M₂ has a mass of 150 kg. If the forward acceleration is 0.60 m/s², then the horizontal force on the tractor due to the ground is (ignore air resistance)

(Multiple Choice)

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Question 111

An object with a mass of 200.0 kg is 500.0 km above the surface of the Earth. The magnitude of the force of gravity on the 200.0 kg mass is (G = 6.67 × 10^-11 N m²/kg², the radius of the Earth is 6.38 × 10⁶ m, and the mass of the Earth is 5.98 × 10²⁴ kg)

(Multiple Choice)

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Question 112

Two masses are connected by a string which passes over pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degree frictionless incline. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The magnitude of the acceleration of the 4.00 kg mass is

(Multiple Choice)

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Question 113

A friction force

(Multiple Choice)

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Question 114

An airplane flies with a constant speed at an angle of 25 degrees above the horizontal, in a straight line. Which statement below is not true?

(Multiple Choice)

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Question 115

In the figure an airport luggage carrying train with a tractor T is pulling three luggage carts M₁, M₂, and M₃, with constant velocity of 4.5 m/s. Unfortunately, the wheels on the carts have locked up and are sliding rather than rolling. If T = 300.0 kg, M₁ = 200.0 kg, M₂ = 100.0 kg, and M₃ = 100.0 kg, and the coefficient of kinetic friction for each is 0.4000, what is the force in the connection between the tractor T and cart M₁? Use g = 9.8 m/s.

(Multiple Choice)

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Question 116

In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, M₁, M₂, and M₃ with an acceleration of 1.0 m/s². If T = 300 kg, M₁ = 200 kg, M₂ = 100 kg, and M₃ = 100 kg, and air resistance is negligible, then the tension in the connection between cart M₂ and cart M₃ is

(Multiple Choice)

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Question 117

Two objects attract each other gravitationally. If the distance between their centers doubles, the gravitational force

(Multiple Choice)

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Question 118

A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on his arms, and the seat exerts an upward force of 500 N. What force does the floor exert on his feet?

(Multiple Choice)

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Question 119

A sled has a mass of 10.0 kg. It is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top of the slope. Find the tension in the rope, assuming it is parallel to the slope.

(Multiple Choice)

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Question 120

Showing 101 - 120 of 130

Exam 4: Force and Newtons Laws of Motion

A 750 N box rests on the floor. The coefficient of static friction between the box and the floor is 0.800, and the coefficient of kinetic friction is 0.600. If a horizontal force of 550 N is applied to the box, what will be the magnitude of the force of friction on the box due to the floor?

An object travels 7.5 m/s toward the west. Under the influence of a constant net force of 5.2 kN, after 4.3 s, it is travelling 2.5 m/s toward the east. What is its mass?

What is the gravitational force between two 5.00 kg masses that are 10.0 cm apart from center to center? (G = 6.67 × 10-11 N m2/kg2)

A tractor T is pulling a trailer M with a constant velocity. If the velocity is 20 m/s and M = 200 kg and T = 500 kg, then the force on the trailer due to the tractor is (assume there is no friction or air resistance)

The highest spot on Earth is Mt. Everest, which is 8850 m above sea level. If the radius of the Earth (to sea level) is 6370 km, how much does the magnitude of g change between sea level and the top of Mt. Everest? (G = 6.67 × 10-11 N m2/kg2, and the mass of the Earth is 5.98 × 1024 kg.)

One person holds a spring scale while another pulls until the scale reads 32 N. What is the force that the person holding the scale applies?

The gravitational field at the Moon due to the Earth is approximately (G = 6.67 × 10-11 N m2/kg2, the mass of the Earth is 5.98 × 1024 kg, and the distance to the Moon is 3.85 × 108 m)

A tractor T is pulling two trailers, M1 and M2, with a constant acceleration. T has a mass of 200 kg, M1 has a mass of 100 kg, and M2 has a mass of 150 kg. If the forward acceleration is 0.60 m/s2, then the horizontal force on the tractor due to the ground is (ignore air resistance)

An object with a mass of 200.0 kg is 500.0 km above the surface of the Earth. The magnitude of the force of gravity on the 200.0 kg mass is (G = 6.67 × 10-11 N m2/kg2, the radius of the Earth is 6.38 × 106 m, and the mass of the Earth is 5.98 × 1024 kg)

A friction force

An airplane flies with a constant speed at an angle of 25 degrees above the horizontal, in a straight line. Which statement below is not true?

Two objects attract each other gravitationally. If the distance between their centers doubles, the gravitational force

A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on his arms, and the seat exerts an upward force of 500 N. What force does the floor exert on his feet?

A sled has a mass of 10.0 kg. It is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top of the slope. Find the tension in the rope, assuming it is parallel to the slope.

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What is the gravitational force between two 5.00 kg masses that are 10.0 cm apart from center to center? (G = 6.67 × 10^-11 N m²/kg²)

The highest spot on Earth is Mt. Everest, which is 8850 m above sea level. If the radius of the Earth (to sea level) is 6370 km, how much does the magnitude of g change between sea level and the top of Mt. Everest? (G = 6.67 × 10^-11 N m²/kg²_,and the mass of the Earth is 5.98 × 10²⁴ kg.)

The gravitational field at the Moon due to the Earth is approximately (G = 6.67 × 10^-11 N m²/kg², the mass of the Earth is 5.98 × 10²⁴ kg, and the distance to the Moon is 3.85 × 10⁸ m)

A tractor T is pulling two trailers, M₁ and M₂, with a constant acceleration. T has a mass of 200 kg, M₁ has a mass of 100 kg, and M₂ has a mass of 150 kg. If the forward acceleration is 0.60 m/s², then the horizontal force on the tractor due to the ground is (ignore air resistance)

An object with a mass of 200.0 kg is 500.0 km above the surface of the Earth. The magnitude of the force of gravity on the 200.0 kg mass is (G = 6.67 × 10^-11 N m²/kg², the radius of the Earth is 6.38 × 10⁶ m, and the mass of the Earth is 5.98 × 10²⁴ kg)