A ventilation fan with a moment of inertia of 0.034 kg*m2 has a net torque of 0.11 N*m applied to it.If it starts from rest, what kinetic energy will it have 8.0 s later?

A) 31 J B) 17 J C) 11 J D) 6.6 J A) 31 J B) 17 J C) 11 J D) 6.6 J

Exam 8: Rotational Equilibrium and Rotational Dynamics

A gyroscope has a moment of inertia of 0.140 kgm²and has an initial angular speed of 15.0 rad/s.If a lubricant is applied to the bearings of the gyroscope so that frictional torque is reduced to 2.00 10^-2 N*m, then in what time interval will the gyroscope coast from 15.0 rad/s to zero?

(Multiple Choice)

4.8/5

(40)

Question 41

The torque caused by a force F applied at a distance r from the axis of rotation, is given by $The torque caused by a force F applied at a distance r from the axis of rotation, is given by , where q is the angle between and .If the magnitudes r and F remain the same, what other angle q¢ will produce the same torque as was produced at angle q if q was less than 90 \degree ?$ , where q is the angle between $The torque caused by a force F applied at a distance r from the axis of rotation, is given by , where q is the angle between and .If the magnitudes r and F remain the same, what other angle q¢ will produce the same torque as was produced at angle q if q was less than 90 \degree ?$ and $The torque caused by a force F applied at a distance r from the axis of rotation, is given by , where q is the angle between and .If the magnitudes r and F remain the same, what other angle q¢ will produce the same torque as was produced at angle q if q was less than 90 \degree ?$ .If the magnitudes r and F remain the same, what other angle q¢ will produce the same torque as was produced at angle q if q was less than 90 $\degree$ ?

(Multiple Choice)

4.9/5

(29)

Question 42

An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall.If the ladder has a mass of 20 kg and it makes an angle of 60 $\degree$ with the ground, find the force of friction of the ground on the foot of the ladder.

(Multiple Choice)

4.7/5

(32)

Question 43

A uniform solid sphere rolls down an incline of height 3 m after starting from rest.In order to calculate its speed at the bottom of the incline, one needs to know:

(Multiple Choice)

4.8/5

(39)

Question 44

A rod of length L is pivoted about its left end and has a force F applied perpendicular to the other end.The force F is now removed and another force F' is applied at the midpoint of the rod.If F' is at an angle of 30 $\degree$ with respect to the rod, what is its magnitude if the resulting torque is the same as when F was applied?

(Multiple Choice)

4.7/5

(37)

Question 45

A baseball pitcher, loosening up his arm before a game, tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball.If the ball starts at rest and is released with a speed of 12 m/s in a time of 0.40 s, what is the average angular acceleration of the arm and ball?

(Multiple Choice)

4.8/5

(43)

Question 46

A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape.Each baton was 0.80 m long and each ball on the end is 0.20 kg.(Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods?

(Multiple Choice)

4.7/5

(32)

Question 47

A ventilation fan with a moment of inertia of 0.034 kgm² has a net torque of 0.11 Nm applied to it.If it starts from rest, what kinetic energy will it have 8.0 s later?

(Multiple Choice)

4.8/5

(31)

Question 48

A cylinder (I = MR²/2) is rolling along the ground at 7.0 m/s.It comes to a hill and starts going up.Assuming no losses to friction, how high does it get before it stops?

(Multiple Choice)

4.8/5

(32)

Question 49

A 3.0-m rod is pivoted about its left end.A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m from the pivot.The 5.2 N is at an angle of 30 $\degree$ to the rod and causes a cw torque.What is the net torque about the pivot?

(Multiple Choice)

4.9/5

(31)

Question 50

A gyroscope has a moment of inertia of 0.14 kg*m² and an initial angular speed of 15 rad/s.Friction in the bearings causes its speed to reduce to zero in 30 s.What is the value of the average frictional torque?

(Multiple Choice)

4.9/5

(40)

Question 51

A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m.What is the moment of inertia of this system of masses about the x-axis?

(Multiple Choice)

4.7/5

(36)

Question 52

A box slides down a frictionless incline, and a hoop rolls down another incline.Both inclines have the same height, and both the box and the hoop have the same mass.If both objects start from rest, upon reaching the bottom of the incline which one will have the greater kinetic energy and which one will have the greater speed?

(Multiple Choice)

4.9/5

(36)

Question 53

A solid cylinder (I = MR²/2) has a string wrapped around it many times.When I release the cylinder, holding on to the string, the cylinder falls and spins as the string unwinds.What is the downward acceleration of the cylinder as it falls?

(Multiple Choice)

4.8/5

(37)

Question 54

A uniform 1.0-N meter stick is suspended horizontally by vertical strings attached at each end.A 2.0-N weight is suspended from the 10-cm position on the stick, another 2.0-N weight is suspended from the 50 cm position, and a 3.0-N weight is suspended from the 60 cm position.What is the tension in the string attached at the 100-cm end of the stick?

(Multiple Choice)

5.0/5

(35)

Question 55

A turntable has a moment of inertia of 3.00 * 10^-2 kg*m² and spins freely on a frictionless bearing at 25.0 rev/min.A 0.300-kg ball of putty is dropped vertically onto the turntable and sticks at a point 0.100 m from the center.What is the new rate of rotation of the system?

(Multiple Choice)

4.8/5

(39)

Question 56

An 800-N billboard worker stands on a 4.0-m scaffold supported by vertical ropes at each end.If the scaffold weighs 500 N and the worker stands 1.0 m from one end, what is the tension in the rope nearest the worker?

(Multiple Choice)

4.8/5

(35)

Question 57

A bucket of water with total mass 23 kg is attached to a rope, which in turn, is wound around a 0.050-m radius cylinder at the top of a well.A crank with a turning radius of 0.25 m is attached to the end of the cylinder.What minimum force directed perpendicular to the crank handle is required to just raise the bucket? (Assume the rope's mass is negligible, that cylinder turns on frictionless bearings, and that g = 9.8 m/s².)

(Multiple Choice)

4.7/5

(32)

Question 58

A tetherball is attached to a pole with a 2.0-m rope.It is circling at 0.20 rev/s.As the rope wraps around the pole it shortens.How long is the rope when the ball is moving at 5.0 m/s?

(Multiple Choice)

4.9/5

(33)

Question 59

The total kinetic energy of a baseball thrown with a spinning motion is a function of:

(Multiple Choice)

4.8/5

(33)

Question 60

Showing 41 - 60 of 83

Exam 8: Rotational Equilibrium and Rotational Dynamics

A gyroscope has a moment of inertia of 0.140 kg*m2 and has an initial angular speed of 15.0 rad/s.If a lubricant is applied to the bearings of the gyroscope so that frictional torque is reduced to 2.00 * 10-2 N*m, then in what time interval will the gyroscope coast from 15.0 rad/s to zero?

The torque caused by a force F applied at a distance r from the axis of rotation, is given by , where q is the angle between and .If the magnitudes r and F remain the same, what other angle q¢ will produce the same torque as was produced at angle q if q was less than 90 °\degree° ?

An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall.If the ladder has a mass of 20 kg and it makes an angle of 60 °\degree° with the ground, find the force of friction of the ground on the foot of the ladder.

A uniform solid sphere rolls down an incline of height 3 m after starting from rest.In order to calculate its speed at the bottom of the incline, one needs to know:

A ventilation fan with a moment of inertia of 0.034 kg*m2 has a net torque of 0.11 N*m applied to it.If it starts from rest, what kinetic energy will it have 8.0 s later?

A cylinder (I = MR2/2) is rolling along the ground at 7.0 m/s.It comes to a hill and starts going up.Assuming no losses to friction, how high does it get before it stops?

A gyroscope has a moment of inertia of 0.14 kg*m2 and an initial angular speed of 15 rad/s.Friction in the bearings causes its speed to reduce to zero in 30 s.What is the value of the average frictional torque?

A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m.What is the moment of inertia of this system of masses about the x-axis?

A solid cylinder (I = MR2/2) has a string wrapped around it many times.When I release the cylinder, holding on to the string, the cylinder falls and spins as the string unwinds.What is the downward acceleration of the cylinder as it falls?

A turntable has a moment of inertia of 3.00 * 10-2 kg*m2 and spins freely on a frictionless bearing at 25.0 rev/min.A 0.300-kg ball of putty is dropped vertically onto the turntable and sticks at a point 0.100 m from the center.What is the new rate of rotation of the system?

An 800-N billboard worker stands on a 4.0-m scaffold supported by vertical ropes at each end.If the scaffold weighs 500 N and the worker stands 1.0 m from one end, what is the tension in the rope nearest the worker?

A tetherball is attached to a pole with a 2.0-m rope.It is circling at 0.20 rev/s.As the rope wraps around the pole it shortens.How long is the rope when the ball is moving at 5.0 m/s?

The total kinetic energy of a baseball thrown with a spinning motion is a function of:

Introduction

Motion in One Dimension

Vectors and Two-Dimensional Motion

The Laws of Motion

Energy

Momentum and Collisions

Rotational Motion and the Law of Gravity

Solids and Fluids

Thermal Physics

Energy in Thermal Processes

The Laws of Thermodynamics

Vibrations and Waves

Sound

Electric Forces and Electric Fields

Electrical Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetism

Induced Voltages and Inductance

Alternating Current Circuits and Electromagnetic Waves

Reflection and Refraction of Light

Mirrors and Lenses

Wave Optics

Optical Instruments

Relativity

Quantum Physics

Atomic Physics

Nuclear Physics

Nuclear Energy and Elementary Particles

Filters

A gyroscope has a moment of inertia of 0.140 kgm²and has an initial angular speed of 15.0 rad/s.If a lubricant is applied to the bearings of the gyroscope so that frictional torque is reduced to 2.00 10^-2 N*m, then in what time interval will the gyroscope coast from 15.0 rad/s to zero?

An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall.If the ladder has a mass of 20 kg and it makes an angle of 60 $\degree$ with the ground, find the force of friction of the ground on the foot of the ladder.

A ventilation fan with a moment of inertia of 0.034 kgm² has a net torque of 0.11 Nm applied to it.If it starts from rest, what kinetic energy will it have 8.0 s later?

A cylinder (I = MR²/2) is rolling along the ground at 7.0 m/s.It comes to a hill and starts going up.Assuming no losses to friction, how high does it get before it stops?

A gyroscope has a moment of inertia of 0.14 kg*m² and an initial angular speed of 15 rad/s.Friction in the bearings causes its speed to reduce to zero in 30 s.What is the value of the average frictional torque?

A solid cylinder (I = MR²/2) has a string wrapped around it many times.When I release the cylinder, holding on to the string, the cylinder falls and spins as the string unwinds.What is the downward acceleration of the cylinder as it falls?

A turntable has a moment of inertia of 3.00 * 10^-2 kg*m² and spins freely on a frictionless bearing at 25.0 rev/min.A 0.300-kg ball of putty is dropped vertically onto the turntable and sticks at a point 0.100 m from the center.What is the new rate of rotation of the system?