A circular disk of mass 0.5 kg and radius 21 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.5 rad/s. a) Find the new angular velocity of the combination; 2.7 rad/s b) The change in the kinetic energy? 0 J c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the original speed in 3 s? 0.013 N*m

A circular disk of mass 0.5 kg and radius 21 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.5 rad/s. a) Find the new angular velocity of the combination; 2.7 rad/s b) The change in the kinetic energy? 0 J c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the original speed in 3 s? 0.013 N*m

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Related questions

Q: A disk with mass m = 9 kg and radius R = 0.37 m begins at rest and accelerates uniformly for t =…

Q: (c) Astronomical observations indicate that the rotational velocity follows a different behaviour:…

A: Vobserved - Black Vcalculated – Red, Blue

Q: A 2 kg ball with a radius of 0.35 meters is initially at rest. The rotational inertia equation for…

A: We know that Torque= Ta=Fr

Q: A wheel accelerates with a constant angular acceleration of 4.5 rad/s^2. If the initial angular…

A: Given data: Angular acceleration (α) = 4.5 rad/s2 Initial angular velocity (ωi) = 1.0 rad/s Time…

Q: A wheel initially has an angular velocity of 18 rad/s but it is slowing at a rate of 2.0 rad/s2. By…

A: Given, The initial angular velocity, ωu=18 rad/s The final angular velocity, ωv=0 rad/s The angular…

Q: An airplane propeller is 2.01 m in length (from tip to tip) with mass 127 kg and is rotating at 2900…

Q: A hollow sphere with a mass of 2.1 kg and radius of 0.15 m rolls without slipping down an incline of…

A: Given, mass of hallow sphere m = 2.1 Kg Radius of hallow sphere r = 0.15 m Incline angle θ=35∘…

Q: A uniform circular disk of moment of inertia 8.0 kg m2 is rotating at 4.0rad/s. A small lump of mass…

Q: A bicycle wheel has a radius r = 0.21 m and rotates at a constant frequency of f = 51 rev/min. r =…

A: The angular frequency, ω = 51rev/min = 5.34rad/s. The time period of rotation of the wheel is

Q: A wheel of radius 0.250 m and mass 35.0 kg starts from rest, and is rotationally accelerated with a…

Q: A sphere of radius R = 30 cm and mass m = 1.8 kg starts from rest and rolls without sliding down a…

Q: Two wheels of moment of inertia 3.6 kg m and 7.6 kg.m2 are set in rotation with angular speed 9.6…

A: Given information: Here, I1 and I2 are the MOI of the two wheels with initial angular speed ω1 and…

Q: 7) A 25-cm-radius wheel is rotating with an angular speed of 16 rad/s. It experiences an angular…

A: Given data: Radius of wheel is, r=25 cm =0.25 m. Initial angular speed is, ω1=16 rad/s. Angular…

Q: A wheel accelerates with a constant angular acceleration, α, of 4.5 rad/s2. If the initial angular…

Q: A grinding wheel is spinning counterclockwise at a rate of 168 rad's When the power to the grinder…

A: The expression for the required time is, ω=αtt=ωα

Q: A 2.0 kg cat (not shown) is on the outer radius (R2) of a ring that can rotate about its center like…

A: The moment of the inertia of the given annular ring, which will remain constant throughout the…

Q: A wheel is rotating freely at angular speed 800 rotations per minute (rpm) on an axle which has…

Q: What is the kinetic energy of a 123 cm long thin uniform rod with a mass of 458 g that is rotating…

A: The rod is rotating about its center of mass so it has only rotational kinetic energy. Kinetic…

Q: A solid sphere of mass 1.5 kg and radius 15 cm rolls without slipping down a 35° incline that is 7.0…

Q: A disk-shaped wheel of mass 1.75 kg and radius 0.6 m is rotating at an initial angular speed of 30…

A: Given: The mass of the disk is 1.75 kg. The radius of the disk is 0.6 m. The initial angular speed…

Q: The two objects in the figure are separated by 4 m, each have a mass of 5 kg, and are connected by a…

Q: A door 1.00 m wide, of mass 15 kg, can rotate freely about a vertical axis through its hinges. A…

A: Step 1:Width of the door is 1mMass of the door is 15kgMass of the bullet is 10g is 0.01kgVelocity of…

Q: A concept car includes a solid disk-shaped flywheel which can be spun up to store rotational kinetic…

A: Given data : Mass of flywheel, m=380kg Radius of the flywheel, r=0.4m Angular speed of the flywheel,…

Q: A uniform sphere with mass 22.0 kgkg and radius 0.340 mm is rotating at constant angular velocity…

A: Given Data: The mass of a uniform sphere is, m=22.0 kg The radius of a sphere is, r=0.340 mm The…

Q: having negligible masses in the figure, and Solid rods running along the y-axis connect the three pa…

A: rotational kinetic energy =(1/2)Iw2

Q: If the wheel of a moment of inertia of 0.150 kg x m^2 slows uniformly from 15.0 rad/s to a stop in…

Q: A neutron star of mass 2 x 100 kg and radius 11.1 km rotates with a period of 0.02 seconds. What is…

A: The moment of inertia here (for a disk) can be given by I=25MR2 ...... (I) The…

Q: A disk spins counter-clockwise at 25.6 rad/s. Due to friction, it slows down at a constant rate.…

Q: A 2.0 kg cat (not shown) is on the outer radius (R2) of a ring that can rotate about its center like…

A: Given: The mass of the cat is 2.0 kg. The inner radius of the ring is 0.80 m. The outer radius of…

Q: A sphere of radius r =34.5 cm and mass m = 1.80 kg starts from rest and rolls without slipping down…

A: Mass of sphere (m) = 1.80 kg Radius of sphere (r) = 34.5 cm = 0.345 m Angle of inclination (θ) = 30°…

Q: Small bodies of mass m, and m₂ are attached to opposite ends of a thin rigid rod of length L and…

Q: The angular velocity of a pulley of mass m and radius R changes with time w(t) = 60e-0.02t (rad/s).…

A: Given: The angular velocity isωt=60e-0.02t rads The expression fir angle rotated is:…

Question

A circular disk of mass 0.5 kg and radius 21 cm, initially not
rotating, slips down a thin spindle onto a turntable (disk) of
mass 1.7 kg and the same radius, rotating freely at 3.5 rad/s.
a) Find the new angular velocity of the combination;
2.7 rad/s
b) The change in the kinetic energy?
0
J
c) If the motor is switched on after the disk has landed, what
is the constant torque needed to regain the original speed in
3 s?
0.013 N*m

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1: Determine the given variables

VIEW

Step 2: Part(a) Calculate the new angular velocity of combination

VIEW

Step 3: Part(b) Calculate The change In the kinetic energy

VIEW

Step 4: Part (c) Calculate constant torque needed to regain the original speed in 3s

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 5 steps with 7 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.

Similar questions

Hi please help: A 20-kg sphere 0.05 m in radius starts from rest and rolls (without slipping) 8.0 m down a ramp that is inclined at 30 degrees with the horizontal. (a) What is the angular speed of the sphere at the bottom of the slope if it starts from rest? (b)How much rotational kinetic energy does the sphere have at the bottom of the slope?
Computation M t = An electric grinder is switched on at t = 0, accelerates uniformly for 17 s to its operating angular speed of 34 rad/s. The wheel then turns at constant angular speed for 34 s and is switched off, slowing uniformly at 9.3 rad/s² until it stops. From the time it is switched off, how long does the grinder take to stop turning? S QL Record your numerical answer below, assuming three significant figures. Remember to include a "-" as necessary.
B. A compact disk rotates from rest to 420 rev/min in 4.5 seconds. (a) How far does a point on the edge of the disk, radius 8.0 cm, travel during this interval? (b) If the disk has mass of 18.2 grams, what is its kinetic energy when rotating at 400 rev/min? (I = MR2) (c) What average power is needed to accelerate the disk to 420rev/min in 4.5 seconds?
A turntable rotates at 33 rev/min. Calculate the angular velocity of the turntable. 3.46 rad/s You are correct. Previous Tries Your receipt no. is 161-6996 > A particle on the turntable is located 0.14 m from the center of the rotating turntable. What is the speed of the particle? Submit Answer Tries 0/40 The particle on the turntable has a mass of 12.2 g. Calculate the force of friction which keeps it from sliding off. Submit Answer Tries 0/40
a) A diver leaps from a platform and immediately goes into a tuck position. If we assume that the diver has an initial angular velocity of 7.5 rad/sec, and has an angular acceleration of -0.22rad/sec2,how long will it take for the diver to complete 2 full revolutions?b) Assume that the diver is 6 m above the water with an initial vertical velocity of 1.74 m/s when she begins to rotate. Will she be able to complete 2 full revolutions before hitting the water? Why or why not?
What is the kinetic energy of a 123 cm long thin uniform rod with a mass of 458 g that is rotating about its center at 4.0 rad/s? Give your answer in Joules.
LAA-2 A solid disk of radius 15.0cm starts at rest and reaches a final angular speed of 1,200rev/min clockwise after turning thru a total of 80.0 revolutions. rotation a) Find the (constant) angular acceleration of the disk in units of radians and seconds. b) Find the final linear speed in m/s of point P on the rim of the disk. c) Find the magnitude of the tangential acceleration of point P on the rim of the disk. point P R=15.0cm d) Find the magnitude of the radial acceleration of point P on the rim of the disk. e) Sketch on your paper a figure like the one to the right and show arrows that represents atan and arad at point P. 9:47 PM 梦 0 arch 66°F Mostly cloudy 9/23/2021 Gup ISTRUCTION