Question

3. A horizontal 800.N merry-go-round of radius 1.50 m is started from rest by a constant horizontal force of 50.0 N applied tangentially to the merry-go-round.

(a) Find the kinetic energy of the merry-go-round after 3.00 s. (Assume it is a solid cylinder.)

(b) A 10.0kg mass is dropped vertically onto the merry-go-round at a point 1.40 m from the center of rotation and sticks to the merry-go-round. Determine the final angular speed of the system.

Answer #1

A horizontal 810-N merry-go-round of radius 1.70 m is started
from rest by a constant horizontal force of 55 N applied
tangentially to the merry-go-round. Find the kinetic energy of the
merry-go-round after 2.0 s. (Assume it is a solid cylinder. Also
assume the force is applied at the outside edge.)

A horizontal 804-N merry-go-round is a solid disk of radius 1.44
m and is started from rest by a constant horizontal force of 49.8 N
applied tangentially to the edge of the disk. Find the kinetic
energy of the disk after 2.91 s.

A horizontal 803-N merry-go-round is a solid disk of radius 1.59
m and is started from rest by a constant horizontal force of 50.2 N
applied tangentially to the edge of the disk. Find the kinetic
energy of the disk after 2.97 s.

A girl and a boy push a merry go round that is initially at
rest. The boy applies 20 N force from 1.0 meter away from the
center tangentially and the girl applies T2=40 N from 0.9 m away
from the center tangentially both rotating counterclockwise. Merry
go round is a solid disc of radius 1.0 m and with mass m=80kg. a)
Calculate the moment of inertia of the merry go round b) Calculate
the net torque c) Calculate its...

a 50.0 kg child is on a 200. kg merry-go-round with a radius of
1.50 m. the child starts at 0.5 m from the center and moves to the
edge. the child's parent accelerates the merry-go-round from rest
at 0.75 rad/s^2 to a speed of 1.5 rad/s. How long did the parent
push the merry-go-round? how much force is required to hold the
child when at 0.5 m from the center? determine the kinetic energy
of the system when moving...

A merry-go-round (radius = 4 m) with a perfect frictionless
bearing is pushed with a force of 24 N by a young girl. She pushes
with a constant force that is oriented tangentially to the
edge of the merry-go-round. After she pushes the merry-go-round
through 14 full rotations (at which point she lets go) it is
spinning with an angular speed of 3 rad/s.
a) What is the moment of inertia of the merry-go-round?
b) After the girl lets go,...

Tommy has a 20 kg metal disc with a redius 1.50 m. the disc
started spinning from the rest by a constant horizontal force of
50.0 N applied tangentially to the metal disc. Find the kinetic
energy of the metal disc after 4.3s.(Assume it is a solid
cylinder.)

A merry-go-round on a playground consists of a horizontal solid
disk with a weight of 795 N and a radius of 1.58 m. A child applies
a force 49.5 N tangentially to the edge of the disk to start it
from rest. What is the kinetic energy of the merry-go-round disk
(in J) after 2.90 s?

A merry-go-round rotates at the rate of 0.20 rev/s with an 75 kg
man standing at a point 2.0 m from the axis of rotation.
(a) What is the new angular speed when the man walks to a point
1.0 m from the center? Assume that the merry-go-round is a solid 25
kg cylinder of radius 2.0 m.
(b) Calculate the change in kinetic energy due to this
movement.

Merry Go
Round
A merry-go-round
with a radius of R = 1.80 m and moment of inertia I
= 201
kg-m2
spinning with an
initial angular speed of ω = 1.5 rad/s in the counter clockwise
direction when viewed from above. A person with mass m =
55
kg and velocity v
= 4.5
m/s runs on a path
tangent to the merry-go-round. Once at the merry-go-round the
person jumps on and holds on to the rim of the
merry-go-round....

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