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 1.2 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 M1 is

A) 840 N. B) 480 N. C) 240 N. D) 120 N. E) 0 N. A) 840 N. B) 480 N. C) 240 N. D) 120 N. E) 0 N.

The Moon (mass 7.35 × 1022 kg) orbits the Earth (mass 5.98 × 1024 kg) at a distance of 3.85 × 108 meters. Meanwhile, the Earth orbits the Sun (mass 1.99 × 1030 kg) at a distance of 1.50 × 1011 meters. When the Moon is directly between the Earth and the Sun, what is the gravitational force on the Moon due to the Earth and the Sun combined? (G = 6.67 × 10-11 N m2/kg2)

A) 4.36 × 1020 N toward the Sun B) 4.36 × 1020 N toward the Earth C) 2.36 × 1020 N toward the Sun D) 2.38 × 1020 N toward the Earth E) 1.98 × 1020 N toward the Earth A) 4.36 × 1020 N toward the Sun B) 4.36 × 1020 N toward the Earth C) 2.36 × 1020 N toward the Sun D) 2.38 × 1020 N toward the Earth E) 1.98 × 1020 N 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, and air resistance is negligible, then the horizontal force on M2 due to the attachment to M1 is

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.

Exam 4: Force and Newtons Laws of Motion

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 1.2 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 M₁ is

(Multiple Choice)

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Question 41

The fundamental force that is the weakest of the four is the

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Question 42

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 as the man moves vertically 3.25 m, and while the piston is pushing, 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 43

A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of friction of magnitude 19 N acts opposite the direction of motion. A stiff wind also opposes the box's motion. What force does the box exert on the boy's hand?

(Multiple Choice)

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Question 44

The Moon (mass 7.35 × 10²² kg) orbits the Earth (mass 5.98 × 10²⁴ kg) at a distance of 3.85 × 10⁸ meters. Meanwhile, the Earth orbits the Sun (mass 1.99 × 10³⁰ kg) at a distance of 1.50 × 10¹¹ meters. When the Moon is directly between the Earth and the Sun, what is the gravitational force on the Moon due to the Earth and the Sun combined? (G = 6.67 × 10^-11 N m²/kg²)

(Multiple Choice)

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Question 45

A skydiver has bailed out of his airplane at a height of 3000 m. The mass of the skydiver and his parachute is 80 kg. What is the drag (force of air resistance) on the system (man plus parachute) when he reaches terminal speed?

(Multiple Choice)

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Question 46

Diane (weight 255 N) is practicing on a tightrope that is 6.00 meters long (when unstretched) and sags by 0.120 meters under her weight. When she is in the middle of the rope, what is the force (due to the rope) on each eyebolt holding the tightrope?

(Multiple Choice)

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Question 47

A box that weighs 300 N is pulled by a rope across a level surface with a constant velocity. The rope makes an angle of 30.0 degrees above the horizontal, and the tension in the rope is 100 N. What is the magnitude of the normal force from the floor on the box?

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Question 48

Two masses are connected by a string which passes over a 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 3.00 kg and the mass on the incline is 6.00 kg. The magnitude of the acceleration of the 3.00 kg mass is

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Question 49

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

(Multiple Choice)

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Question 50

An airplane is traveling in level flight at a constant velocity. L is the lift, W is the weight, T is the thrust, and D is the drag. Which of the diagrams is the correct free-body force diagram for the airplane?

(Multiple Choice)

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Question 51

A 120 N traffic light is located at the midpoint of a cable between two poles. The cable makes an angle of 30° to the horizontal at each pole. What is the tension in the cable? Ignore the mass of the cable.

(Multiple Choice)

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Question 52

A mountain climber lies flat on the surface of a glacier (assumed frictionless), which is inclined at 30 degrees to the horizontal. He remains stationary because he is holding on to a rope that is attached to a spike in the ice further up the slope. The rope is parallel to the surface of the ice. If the force of the ice on the climber is 210 N, what is the tension in the rope?

(Multiple Choice)

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Question 53

A worker lifts a heavy load using a two-pulley system as in the figure. If the tension in the rope segment labeled A is 1450 N, what are the weight of the load and the force that the worker exerts on the rope, respectively?

(Multiple Choice)

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Question 54

An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?

(Multiple Choice)

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Question 55

A 750 N box moves at a constant velocity on a floor with a coefficient of static friction μ_s = 0.800 and coefficient of kinetic friction μ_k = 0.600. What horizontal force is required to keep the box moving?

(Multiple Choice)

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Question 56

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, and air resistance is negligible, then the horizontal force on M₂ due to the attachment to M₁ is

(Multiple Choice)

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Question 57

Your friend applies a horizontal force to your 2.0-kg physics textbook, holding it stationary against a vertical wall. The static and kinetic friction coefficients between the book and the wall are 0.20 and 0.15, respectively. With what force must your friend push on the book in order for it not to slip down the wall?

(Multiple Choice)

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Question 58

A space probe leaves the solar system to explore interstellar space. Once it is far from any stars, when must it fire its rocket engines?

(Multiple Choice)

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Question 59

A 20-kg sack of potatoes at the corner store weighs

(Multiple Choice)

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Question 60

Showing 41 - 60 of 130

Exam 4: Force and Newtons Laws of Motion

The fundamental force that is the weakest of the four is the

A box is pushed across a horizontal table by a boy applying a force of 32 N to the box. A force of friction of magnitude 19 N acts opposite the direction of motion. A stiff wind also opposes the box's motion. What force does the box exert on the boy's hand?

A skydiver has bailed out of his airplane at a height of 3000 m. The mass of the skydiver and his parachute is 80 kg. What is the drag (force of air resistance) on the system (man plus parachute) when he reaches terminal speed?

Diane (weight 255 N) is practicing on a tightrope that is 6.00 meters long (when unstretched) and sags by 0.120 meters under her weight. When she is in the middle of the rope, what is the force (due to the rope) on each eyebolt holding the tightrope?

A box that weighs 300 N is pulled by a rope across a level surface with a constant velocity. The rope makes an angle of 30.0 degrees above the horizontal, and the tension in the rope is 100 N. What is the magnitude of the normal force from the floor on the box?

An airplane is traveling in level flight at a constant velocity. L is the lift, W is the weight, T is the thrust, and D is the drag. Which of the diagrams is the correct free-body force diagram for the airplane?

A 120 N traffic light is located at the midpoint of a cable between two poles. The cable makes an angle of 30° to the horizontal at each pole. What is the tension in the cable? Ignore the mass of the cable.

A worker lifts a heavy load using a two-pulley system as in the figure. If the tension in the rope segment labeled A is 1450 N, what are the weight of the load and the force that the worker exerts on the rope, respectively?

An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?

A 750 N box moves at a constant velocity on a floor with a coefficient of static friction μs = 0.800 and coefficient of kinetic friction μk = 0.600. What horizontal force is required to keep the box moving?

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, and air resistance is negligible, then the horizontal force on M2 due to the attachment to M1 is

A space probe leaves the solar system to explore interstellar space. Once it is far from any stars, when must it fire its rocket engines?

A 20-kg sack of potatoes at the corner store weighs

Introduction

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A 750 N box moves at a constant velocity on a floor with a coefficient of static friction μ_s = 0.800 and coefficient of kinetic friction μ_k = 0.600. What horizontal force is required to keep the box moving?