An astronaut who weighs 800 N on the surface of the earth lifts off from planet Zuton in a space ship.The free-fall acceleration on Zuton is 3.0 m/s2 (down).At the moment of liftoff the acceleration of the space ship is 0.50 m/s2 (up).What is the magnitude of the force of the space ship on the astronaut?

A) 41 N B) 0.29 kN C) 0.24 kN D) 0.20 kN E) 0.37 kN A) 41 N B) 0.29 kN C) 0.24 kN D) 0.20 kN E) 0.37 kN

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2.What is the magnitude of the force the object exerts on the floor of the elevator?

A) 59 N B) 10 N C) 89 N D) 68 N E) 78 N A) 59 N B) 10 N C) 89 N D) 68 N E) 78 N

Exam 4: The Laws of Motion

At an instant when a 4.0-kg object has an acceleration equal to $( 5 \hat { \mathbf { i } } + 3 \hat { \mathbf { j } } )$ m/s²,one of the two forces acting on the object is known to be $( 12 \tilde { \mathbf { i } } + 22 \tilde { \mathbf { j } } )$ N.Determine the magnitude of the other force acting on the object.

(Multiple Choice)

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Question 41

Two people,each of 70 kg mass,are riding in an elevator.One is standing on the floor.The other is hanging on a rope suspended from the ceiling.Compare the force $\overrightarrow { \mathbf { F } } _ { F }$ the floor exerts on the first person to the force $\overrightarrow { \mathrm { F } } _ { R }$ the rope exerts on the second person.Which statement is correct?

(Multiple Choice)

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Question 42

A 2.0-kg block slides on a frictionless 15 $\degree$ inclined plane.A force acting parallel to the incline is applied to the block.The acceleration of the block is 1.5 m/s² down the incline.What is the applied force?

(Multiple Choice)

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Question 43

A 1.5-kg object has a velocity of 5 ĵ m/s at t = 0.It is accelerated at a constant rate for five seconds after which it has a velocity of (6 î + 12 ĵ1 )m/s.What is the direction of the resultant force acting on the object during this time interval?

(Multiple Choice)

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Question 44

A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin.Its upper end leans against a vertical frictionless wall as shown in the figure.What is the magnitude of the force the pin exerts on the beam?

(Multiple Choice)

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Question 45

A uniform 100-lb beam is held in a vertical position by a pin at its lower end and a cable at its upper end.A horizontal force (magnitude P)acts as shown in the figure.If P = 75 lb,what is the tension in the cable?

(Multiple Choice)

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Question 46

The diagrams below show forces applied to a wheel that weighs 20 N.The symbol W stands for the weight.In which diagram(s)is(are)the wheel in equilibrium?

(Multiple Choice)

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Question 47

A 3.0-kg block moves up a 40 $\degree$ incline with constant speed under the action of a 26-N force acting up and parallel to the incline.What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?

(Multiple Choice)

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Question 48

A 1.5-kg mass has an acceleration of (4.0 î - ĵ )m/s².Only two forces act on the mass.If one of the forces is (2.0 î - 1.4 ĵ )N,what is the magnitude of the other force?

(Multiple Choice)

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Question 49

A 6.00 kg block is placed on a 30.0 $\degree$ incline and connected to another block on a 36.87 $\degree$ incline.Although the surfaces are frictionless the blocks do not move.What is the mass in kilograms of the block on the 36.87 $\degree$ incline? $A 6.00 kg block is placed on a 30.0 \degree incline and connected to another block on a 36.87 \degree incline.Although the surfaces are frictionless the blocks do not move.What is the mass in kilograms of the block on the 36.87 \degree incline?$

(Multiple Choice)

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Question 50

An astronaut who weighs 800 N on the surface of the earth lifts off from planet Zuton in a space ship.The free-fall acceleration on Zuton is 3.0 m/s² (down).At the moment of liftoff the acceleration of the space ship is 0.50 m/s² (up).What is the magnitude of the force of the space ship on the astronaut?

(Multiple Choice)

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Question 51

If F = 8.0 N and M = 1.0 kg,what is the tension in the connecting string? The pulley and all surfaces are frictionless.

(Multiple Choice)

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Question 52

Three boxes slide on a frictionless horizontal surface when pulled by a force of magnitude F.When we compare the tensions T₁ and T₂ with the force F,we find that

(Multiple Choice)

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Question 53

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s².What is the magnitude of the force the object exerts on the floor of the elevator?

(Multiple Choice)

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Question 54

In order to jump off the floor,the floor must exert a force on you

(Multiple Choice)

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Question 55

A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails of magnitude 6 000 N directed toward the northwest (45 $\degree$ N of W).What is the magnitude and direction of the resultant acceleration?

(Short Answer)

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Question 56

If F = 40 N and M = 1.5 kg,what is the tension in the string connecting M and 2M? Assume that all surfaces are frictionless.

(Multiple Choice)

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Question 57

The apparent weight of a fish in an elevator is greatest when the elevator

(Multiple Choice)

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Question 58

Two people,each of 70 kg mass,are riding in an elevator.One is standing on the floor.The other is hanging on a rope suspended from the ceiling.Compare the acceleration $\overrightarrow { \mathbf { a } } _ { F }$ of the first person to the acceleration $\overrightarrow { \mathbf { a } } _ { R }$ of the second person.Which statement is correct?

(Multiple Choice)

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Question 59

In the figure,if the tension in string 1 is 34 N and the tension in string 2 is 24 N,what is the mass of the object shown?

(Multiple Choice)

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Question 60

Showing 41 - 60 of 97

Exam 4: The Laws of Motion

A 2.0-kg block slides on a frictionless 15 °\degree° inclined plane.A force acting parallel to the incline is applied to the block.The acceleration of the block is 1.5 m/s2 down the incline.What is the applied force?

A 1.5-kg object has a velocity of 5 ĵ m/s at t = 0.It is accelerated at a constant rate for five seconds after which it has a velocity of (6 î + 12 ĵ1 )m/s.What is the direction of the resultant force acting on the object during this time interval?

A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin.Its upper end leans against a vertical frictionless wall as shown in the figure.What is the magnitude of the force the pin exerts on the beam?

A uniform 100-lb beam is held in a vertical position by a pin at its lower end and a cable at its upper end.A horizontal force (magnitude P)acts as shown in the figure.If P = 75 lb,what is the tension in the cable?

The diagrams below show forces applied to a wheel that weighs 20 N.The symbol W stands for the weight.In which diagram(s)is(are)the wheel in equilibrium?

A 3.0-kg block moves up a 40 °\degree° incline with constant speed under the action of a 26-N force acting up and parallel to the incline.What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?

A 1.5-kg mass has an acceleration of (4.0 î - ĵ )m/s2.Only two forces act on the mass.If one of the forces is (2.0 î - 1.4 ĵ )N,what is the magnitude of the other force?

A 6.00 kg block is placed on a 30.0 °\degree° incline and connected to another block on a 36.87 °\degree° incline.Although the surfaces are frictionless the blocks do not move.What is the mass in kilograms of the block on the 36.87 °\degree° incline?

If F = 8.0 N and M = 1.0 kg,what is the tension in the connecting string? The pulley and all surfaces are frictionless.

Three boxes slide on a frictionless horizontal surface when pulled by a force of magnitude F.When we compare the tensions T1 and T2 with the force F,we find that

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2.What is the magnitude of the force the object exerts on the floor of the elevator?

In order to jump off the floor,the floor must exert a force on you

A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails of magnitude 6 000 N directed toward the northwest (45 °\degree° N of W).What is the magnitude and direction of the resultant acceleration?

If F = 40 N and M = 1.5 kg,what is the tension in the string connecting M and 2M? Assume that all surfaces are frictionless.

The apparent weight of a fish in an elevator is greatest when the elevator

In the figure,if the tension in string 1 is 34 N and the tension in string 2 is 24 N,what is the mass of the object shown?

Introduction and Vectors

Motion in One Dimension

Motion in Two Dimensions

More Applications of Newtons Laws

Energy of a System

Conservation of Energy

Momentum and Collisions

Relativity

Rotational Motion

Gravity,planetary Orbits,and the Hydrogen Atom

Oscillatory Motion

Mechanical Waves

Superposition and Standing Waves

Fluid Mechanics

Temperature and the Kinetic Theory of Gases

Energy in Thermal Processes: the First Law of Thermodynamics

Heat Engines,entropy,and the Second Law of Thermodynamics

Electric Forces and Electric Fields

Electric Potential and Capacitance

Current and Direct Current Circuits

Magnetic Forces and Magnetic Fields

Faradays Law and Inductance

Electromagnetic Waves

Reflection and Refraction of Light

Image Formation by Mirrors and Lenses

Wave Optics

Quantum Physics

Atomic Physics

Nuclear Physics

Particle Physics

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A 2.0-kg block slides on a frictionless 15 $\degree$ inclined plane.A force acting parallel to the incline is applied to the block.The acceleration of the block is 1.5 m/s² down the incline.What is the applied force?

A 3.0-kg block moves up a 40 $\degree$ incline with constant speed under the action of a 26-N force acting up and parallel to the incline.What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?

A 1.5-kg mass has an acceleration of (4.0 î - ĵ )m/s².Only two forces act on the mass.If one of the forces is (2.0 î - 1.4 ĵ )N,what is the magnitude of the other force?

Three boxes slide on a frictionless horizontal surface when pulled by a force of magnitude F.When we compare the tensions T₁ and T₂ with the force F,we find that

An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s².What is the magnitude of the force the object exerts on the floor of the elevator?

A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails of magnitude 6 000 N directed toward the northwest (45 $\degree$ N of W).What is the magnitude and direction of the resultant acceleration?