A sphere is dropped from a great height and when its speed reaches 20 m/s,its acceleration downward is 8.4 m/s2.If the drag force is proportional to the square of the speed,what will be its acceleration downward when its speed reached 40 m/s?

A) 2.6 m/s2 B) 4.2 m/s2 C) 8.0 m/s2 D) 0 m/s2 because it has now reached terminal velocity. A) 2.6 m/s2 B) 4.2 m/s2 C) 8.0 m/s2 D) 0 m/s2 because it has now reached terminal velocity. B

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s2 and air resistance is negligible,then what is the magnitude of the horizontal component of velocity as the rock strikes the ground?

A) 7.5 m/s B) 9.0 m/s C) 12 m/s D) 29 m/s A) 7.5 m/s B) 9.0 m/s C) 12 m/s D) 29 m/s

A 6.0-kg object is falling downward with an acceleration of 3.27 m/s2.Of the following values,which is nearest to the drag force on the object?

A) 3.3 N B) 65 N C) 20 N D) 39 N A) 3.3 N B) 65 N C) 20 N D) 39 N

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s2 and air resistance is negligible,then what is the speed of the rock as it hits the ground?

A) 30 m/s B) 32 m/s C) 34 m/s D) 36 m/s A) 30 m/s B) 32 m/s C) 34 m/s D) 36 m/s

Exam 4: The Laws of Motion: Part A

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A sphere is dropped from a great height and when its speed reaches 20 m/s,its acceleration downward is 8.4 m/s².If the drag force is proportional to the square of the speed,what will be its acceleration downward when its speed reached 40 m/s?

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Question 1

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Dana uses a rope to pull a box that weighs 300 N across a level surface with constant velocity.The rope makes an angle of 30° above the horizontal and the tension in the rope is 50 N.What is the coefficient of friction?

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A 12.0-kg mass is placed on a 25.0° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.580 and the coefficient of sliding friction is 0.520.The mass is given a shove causing it to slide down the incline.Taking down the incline as positive,what is the acceleration of the mass while it is sliding?

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A 2000-kg sailboat experiences an eastward force of 2000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest (45° N of W).What is the direction of the resultant acceleration?

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Question 4

A baseball is moving in the air along the customary parabola.Ignoring air drag,where is the force on the baseball zero?

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Question 5

A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 14 m/s.A stop watch measures the stone's trajectory time from top of cliff to bottom to be 7.1 s.How far out from the cliff's edge does the stone travel horizontally? Note: g = 9.8 m/s² and air resistance is negligible.

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Question 6

A projectile is fired over a horizontal surface at an angle of elevation of 70°.Neglecting air resistance,what are possible angles in flight between the acceleration vector and the velocity vector?

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Question 7

A sled is on a horizontal surface and a rope with tension T is pulling on it at an angle θ above the horizontal.The sled had mass M and does not move due to the frictional force.In this case the coefficient of friction is μ_s.In terms of the variables given and g,what is the magnitude of the frictional force in this case?

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Question 8

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s² and air resistance is negligible,then what is the magnitude of the horizontal component of velocity as the rock strikes the ground?

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Question 9

An Olympic skier moving at 22.0 m/s down a 30.0° slope encounters a region of wet snow,of coefficient of friction µ_k = 0.740.How far down the slope does she go before stopping?

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Question 10

A 500-N tightrope walker stands at the center of the rope.If the rope can withstand a tension of 1400 N without breaking,what is the minimum angle the rope can make with the horizontal?

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Question 11

A plane is moving due north,directly towards its destination.Its airspeed is 200 mph.A constant breeze is blowing from west to east at 40 mph.How long will it take for the plane to travel 200 miles north?

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Question 12

A 12.0-kg mass is placed on a 25.0° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.580,and the coefficient of sliding friction is 0.520.The mass is given a shove causing it to slide down the incline.What is the frictional force while the mass is sliding?

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Question 13

A projectile is launched with speed v at an angle θ,the angle being less than 45º.What other angle would give the same range for this projectile launched at the same speed v?

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Question 14

A 6.0-kg object is falling downward with an acceleration of 3.27 m/s².Of the following values,which is nearest to the drag force on the object?

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Question 15

A bridge that was 8.3 m long has been washed out by the rain several days ago.How fast must a car be going to successfully jump the stream? Although the road is level on both sides of the bridge,the road on the far side is 2.0 m lower than the road on this side.

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Question 16

A solid steel ball is dropped from a great height and when its speed reaches 20 m/s its acceleration downward is 7.35 m/s².What would be the terminal velocity in this situation?

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Question 17

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s² and air resistance is negligible,then what is the speed of the rock as it hits the ground?

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Question 18

A 150-N sled is pulled up a 28° slope at a constant speed by a force of 120 N.What is the coefficient of kinetic friction between sled and slope?

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Question 19

Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped).His x-ray vision tells him Lois LaTour is inside.If Superguy is 1.00 km away from the tower,and the elevator falls from a height of 2.1 × 10² m,how long does Superguy have to save Lois,and what must be his average speed?

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Question 20

Showing 1 - 20 of 69

Exam 4: The Laws of Motion: Part A

A sphere is dropped from a great height and when its speed reaches 20 m/s,its acceleration downward is 8.4 m/s2.If the drag force is proportional to the square of the speed,what will be its acceleration downward when its speed reached 40 m/s?

Dana uses a rope to pull a box that weighs 300 N across a level surface with constant velocity.The rope makes an angle of 30° above the horizontal and the tension in the rope is 50 N.What is the coefficient of friction?

A 2000-kg sailboat experiences an eastward force of 2000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest (45° N of W).What is the direction of the resultant acceleration?

A baseball is moving in the air along the customary parabola.Ignoring air drag,where is the force on the baseball zero?

A projectile is fired over a horizontal surface at an angle of elevation of 70°.Neglecting air resistance,what are possible angles in flight between the acceleration vector and the velocity vector?

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s2 and air resistance is negligible,then what is the magnitude of the horizontal component of velocity as the rock strikes the ground?

An Olympic skier moving at 22.0 m/s down a 30.0° slope encounters a region of wet snow,of coefficient of friction µk = 0.740.How far down the slope does she go before stopping?

A 500-N tightrope walker stands at the center of the rope.If the rope can withstand a tension of 1400 N without breaking,what is the minimum angle the rope can make with the horizontal?

A plane is moving due north,directly towards its destination.Its airspeed is 200 mph.A constant breeze is blowing from west to east at 40 mph.How long will it take for the plane to travel 200 miles north?

A projectile is launched with speed v at an angle θ,the angle being less than 45º.What other angle would give the same range for this projectile launched at the same speed v?

A 6.0-kg object is falling downward with an acceleration of 3.27 m/s2.Of the following values,which is nearest to the drag force on the object?

A bridge that was 8.3 m long has been washed out by the rain several days ago.How fast must a car be going to successfully jump the stream? Although the road is level on both sides of the bridge,the road on the far side is 2.0 m lower than the road on this side.

A solid steel ball is dropped from a great height and when its speed reaches 20 m/s its acceleration downward is 7.35 m/s2.What would be the terminal velocity in this situation?

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s2 and air resistance is negligible,then what is the speed of the rock as it hits the ground?

A 150-N sled is pulled up a 28° slope at a constant speed by a force of 120 N.What is the coefficient of kinetic friction between sled and slope?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

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A sphere is dropped from a great height and when its speed reaches 20 m/s,its acceleration downward is 8.4 m/s².If the drag force is proportional to the square of the speed,what will be its acceleration downward when its speed reached 40 m/s?

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s² and air resistance is negligible,then what is the magnitude of the horizontal component of velocity as the rock strikes the ground?

An Olympic skier moving at 22.0 m/s down a 30.0° slope encounters a region of wet snow,of coefficient of friction µ_k = 0.740.How far down the slope does she go before stopping?

A 6.0-kg object is falling downward with an acceleration of 3.27 m/s².Of the following values,which is nearest to the drag force on the object?

A solid steel ball is dropped from a great height and when its speed reaches 20 m/s its acceleration downward is 7.35 m/s².What would be the terminal velocity in this situation?

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s² and air resistance is negligible,then what is the speed of the rock as it hits the ground?