The time required by the bit to be rest

Question

You turn off your electric drill and find that the time interval for the rotating bit to come to rest due to frictionl torque in the drill is ∆t. You replace the bit with a larger one that results in a doubling of the moment of inertia of the drill's entire rotating mechanism. When the larger bit is rotated at the same angular speed as the first and the drill is turned off, the frictional torque remains the same as that for the previous situation. What is the time interval for this second bit to come to rest? a. 4∆t b. 2∆t c. ∆t d. 0.5∆t e. 0.25∆t f. Impossible to determine

Answer 1

Question

Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .

Chapter 10.7, Problem 10.6QQ

To determine

The time required by the bit to be rest

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You turn off your electric drill and find that the time interval for the rotating bit to come to rest due to frictionl torque in the drill is ∆t. You replace the bit with a larger one that results in a doubling of the moment of inertia of the drill's entire rotating mechanism. When the larger bit is rotated at the same angular speed as the first and the drill is turned off, the frictional torque remains the same as that for the previous situation. What is the time interval for this second bit to come to rest? a. 4∆t b. 2∆t c. ∆t d. 0.5∆t e. 0.25∆t f. Impossible to determine

In a satellite model for a science project, given the masses of the three satellites ma=1.8 kg, mB=2.2 kg, and mc=4.6 kg that are connected with massless rods, joined at the point the rotation axis is passing through. The satellites have the distances rad RA= 1.2 m, RB= 0.5 m, and Rc=1.6 m, from the rotation axis. The system rotates with an angular speed w=2.9 RA RB RC 1. Calculate the moment of inertia /, for this model: I; = kg m2 %3D 2. Calculate the magnitude of the angular momentum L, = m2 kg 3. Calculate the rotational kinetic energy K; = J %3D 4. As the system is rotating counter-clockwise the direction of the vector is The mass mc was not properly glued and breaks away during the rotation. 4 1. Calculate the moment of inertia If for this model now. I;= kg m2

can you please do (d) and (e)?

Answer 2

Question

Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .

Chapter 10.7, Problem 10.6QQ

To determine

The time required by the bit to be rest

Expert Solution & Answer

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Check out sample textbook solution

Answer 3

Question

Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .

Chapter 10.7, Problem 10.6QQ

To determine

The time required by the bit to be rest

Expert Solution & Answer

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See solution

Check out sample textbook solution

Answer 4

Question

Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .

Chapter 10.7, Problem 10.6QQ

To determine