Question
In: Physics
A person stands at the center of a turntable, holding his arms extended horizontally with a...
A person stands at the center of a turntable, holding his arms extended horizontally with a 1.5 kg dumbbell in each hand. He is set rotation about a vertical axis, making one revolution in 2 seconds. Find the new angular velocity if he pulls the dumbbells in to his middle. His moment of inertia (without dumbbells) is 3 kgm2 when his arms are out stretched, dropping to 2.2 kgm2 when his hands are at his middle. The dumbbells are 1 m from the axis initially and 0.2 m from it when moved to his middle.
Solutions
genius_generous answered 1 year agoRelated Solutions
A student sits on a rotating stool holding two 2.2-kg objects. When his arms are extended...
A student sits on a rotating stool holding two 2.2-kg objects.
When his arms are extended horizontally, the objects are 1.0 m from
the axis of rotation and he rotates with an angular speed of 0.75
rad/s. The moment of inertia of the student plus stool is 3.0 kg ·
m2 and is assumed to be constant. The student then pulls in the
objects horizontally to 0.46 m from the rotation axis. (a) Find the
new angular speed of the...
A person holds a ladder horizontally at its center. Treating the ladder as a uniform rod...
A person holds a ladder horizontally at its center.
Treating the ladder as a uniform rod of length 3.10 m and mass
8.56 kg , find the torque the person must exert on the ladder to
give it an angular acceleration of 0.238 rad/s2 .
A person of mass 74 kg stands at the center of a rotating merry-go-round platform of...
A person of mass 74 kg stands at the center of a rotating
merry-go-round platform of radius 3.5 m and moment of inertia 880
kg⋅m2 . The platform rotates without friction with angular velocity
0.90 rad/s . The person walks radially to the edge of the
platform.
Calculate the angular velocity when the person reaches the
edge.
Calculate the rotational kinetic energy of the system of
platform plus person before and after the person's walk.
A 65 kg woman stands at the rim of a horizontal turntable having a moment of...
A 65 kg woman stands at the rim of a horizontal turntable having
a moment of inertia of 520 kg·m2 and a radius of 2.0 m.
The turntable is initially at rest and is free to rotate about a
frictionless vertical axle through its center. The woman then
starts walking around the rim clockwise (as viewed from above the
system) at a constant speed of 1.5 m/s relative to the Earth.
(a) In what direction and with what angular speed...
A 54.0-kg woman stands at the western rim of a horizontal turntable having a moment of...
A 54.0-kg woman stands at the western rim of a
horizontal turntable having a moment of inertia of
490 kg · m2 and a radius of 2.00 m. The
turntable is initially at rest and is free to rotate about a
frictionless, vertical axle through its center. The woman then
starts walking around the rim clockwise (as viewed
from above the system) at a constant speed of 1.50 m/s relative to
the Earth. Consider the woman–turntable system as motion
begins....
A 50.0-kg woman stands at the rim of a horizontal turntable having a moment of inertia...
A 50.0-kg woman stands at the rim of a horizontal turntable
having a moment of inertia of 420 kg · m2 and a radius
of 2.00 m. The turntable is initially at rest and is free to rotate
about a frictionless vertical axle through its center. The woman
then starts walking around the rim clockwise (as viewed from above
the system) at a constant speed of 1.50 m/s relative to the
Earth.
(a) In what direction does the turntable rotate?...
A woman stands at the edge of a cliff and throws a rock horizontally over the...
A woman stands at the edge of a cliff and throws a rock
horizontally over the edge with a speed of
v0 = 16.0 m/s. The rock leaves her
hand at a height of h = 33.0 m above level ground
at the bottom of the cliff, as shown in the figure. Note the
coordinate system in the figure, where the origin is at the bottom
of the cliff, directly below where the rock leaves the hand.
Write the equations...
A student stands at the edge of a cliff and throws a stone horizontally over the...
A student stands at the edge of a cliff and throws a stone
horizontally over the edge with a speed of vi = 10.0 m/s. The cliff
is h = 41.9 m above a body of water as shown in the figure below.
With what speed and angle of impact does the stone land?
A student stands at the edge of a cliff and throws a stone horizontally over the...
A student stands at the edge of a cliff and throws a stone
horizontally over the edge with a speed of 10.0 m/s. the cliff is
50.0 m above a flat horizontal beach. (a) how long after being
released does the stone strike the beach before the cliff? (b) find
the speed just before the stone strikes the beach. (c) find the
traveling horizontal distance for the stone
A coin is placed on a flat turntable, a distance 18.6 cm from the center of...
A coin is placed on a flat turntable, a distance 18.6 cm from
the center of rotation. The coefficient of static friction between
the turntable and the coin is 0.8. At what maximum angular speed
may the turntable be rotating before the force of friction is not
able to keep the coin at the same distance from the axis? Hint: if
you think a critical piece of information is missing, assign it a
letter, and see if it cancels in...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- The files SpeedControl.java and SpeedControlPanel.java contain a program (and its associated panel) with a circle that...
- Calculate the ideal age of a spouse. Enter either m or f from the keyboard in...
- Due to a recession, expected inflation this year is only 4.75%. However, the inflation rate in...
- What are the benefits of doing a pilot program before a full scale rollout of a...
- It is a calm summer day in southeast Iowa at the Ottumwa air traffic control radar...
- 1. Write a detailed article on Evolution of attacks on the internet & web [your article...
- Analyze the role of the contingency plan coordinator (CPC) in the scope of preparing a BIA....
ADVERTISEMENT