Question

A 2.8-mm-diameter merry-go-round with a mass of 240 kgkg is spinning at 20 rpmrpm. John runs around the merry-go-round at 5.0 m/sm/s, in the same direction that it is turning, and jumps onto the outer edge. John’s mass is 32 kg.

What is the merry-go-round's angular speed, in rpmrpm, after John jumps on?

Express your answer in revolutions per minute. (rpm)

Answer #1

A 2.8-m -diameter merry-go-round with a mass of 230 kg is
spinning at 20 rpm . John runs around the merry-go-round at 5.0 m/s
, in the same direction that it is turning, and jumps onto the
outer edge. John’s mass is 35 kg . What is the merry-go-round's
angular speed, in rpm, after John jumps on?

A 2-m-diameter merry-go-round with a mass of 250 kg is spinning
at 20 rpm. John runs around the merry-go-round at5.0 m/s, in the
same direction that it is turning, and jumps onto the outer edge.
John’s mass is 31 kg .
Part A
What is the merry-go-round's angular speed, in rpm, after John
jumps on?

)A 3.5-m diameter merry-go-round with a mass of 275 kg is
spinning at 22 rpm. John runs around the merry-go-round at 5.0 m/s
in the opposite direction that the merry-go-round is turning, and
jumps onto the outer edge. John’s mass is 30 kgAfter John jumps on,
a torque is applied that eventually slows down the merry-go-round.
If the merry-go-round comes to a stop 15.6 seconds after the torque
is applied, what is the magnitude of the torque?

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turning, and jumps onto the outer edge. John's mass is 30 kg.

A 2.8-m-diameter merry-go-round with rotational inertia 110
kg?m2 is spinning freely at 0.60 rev/s . Four 25-kg children sit
suddenly on the edge of the merry-go-round.
a.) Find the new angular speed.
b.) Determine the total energy lost to friction between the
children and the merry-go-round.

Two children, Angelica (mass 25 kg) and Boris (mass 50 kg), are
playing on a merry-go-round (which you can assume is a solid disk
with mass 225 kg and radius 1.5m). Assume that any friction on the
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Part A: Angelica starts spinning the merry-go-round, giving it
an angular velocity of 8 rad/s, then she stops pushing it. Boris
runs with a speed of 6 m/s directly toward the center of the
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Three children are riding on the edge of a merry-go-round that
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The children have masses of 29.0 kg, 28.2 kg and 33.6 kg. If the
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revolutions/minute?

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A playground merry-go-round (of mass 123 kg and radius 1.90 m)
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merry-go-round, the person was moving in the same direction as the
merry-go-round's rim.
What is the final angular speed of the merry-go-round?

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