Question

A 3.6-meter long horizontal plank is held up by two supports. One support is at the left end, and the other is 0.80 m from the right end. The plank has uniform density and has a mass of 40 kg. How close can a 70 kg person stand to the unsupported end before causing the plank to rotate?

Answer #1

A 12.0-kg horizontal plank 4.00 m long rests on two supports,
one at the left end and a second 1.00 m from the right end. What is
the magnitude of the force exerted on the plank by the support near
the right end?
____ N

A wooden beam with mass of 30 kg is placed over two supports.
The beam is just resting on top of the supports - it is not
connected to the supports. The beam is 5 meters long and 2 meters
is cantilevered out over the right-hand support. How far from the
right end of the beam could a 50 kg person stand before the beam
tips? (Hint: Think about what happens to the left reaction force
when the beam just...

A
house painter is standing on a uniform horizontal platform that is
held in equilibrium by two cables attached to supports on the roof
of the building. The painter has a mass of 79.2 kg and the mass of
the platform is 18.0 kg. The distance from the left end of the
platform to where the painter is standing is d = 2.0 m and the
total length of the platform is 4.70 m.
How large is the force exerted...

Two friends are holding up opposite ends of a horizontal 5 meter
long 10 kg pole. One of them suddenly lets go.
What is the net torque on the pole about the hand of the person
still holding the pole?
b) What is the magnitude of angular acceleration of
the pole immediately after one of them lets
go? The moment of inertia of a pole about one end
is 1/3 MR2

A gymnast with mass m1 = 47 kg is on a balance beam
that sits on (but is not attached to) two supports. The beam has a
mass m2 = 121 kg and length L = 5 m. Each support is 1/3
of the way from each end. Initially the gymnast stands at the left
end of the beam.
1)
What is the force the left support exerts on the beam?
N
2)
What is the force the right support...

A gymnast with mass m1 = 47 kg is on a balance beam
that sits on (but is not attached to) two supports. The beam has a
mass m2 = 121 kg and length L = 5 m. Each support is 1/3
of the way from each end. Initially the gymnast stands at the left
end of the beam.
1)
What is the force the left support exerts on the beam?
N
2)
What is the force the right support...

A gymnast with mass m1 = 40 kg is on a balance beam
that sits on (but is not attached to) two supports. The beam has a
mass m2 = 103 kg and length L = 5 m. Each support is 1/3
of the way from each end. Initially the gymnast stands at the left
end of the beam.
How much extra mass could the gymnast hold before the beam
begins to tip?
Now the gymnast (not holding any additional...

a) Two horizontal plates, aligned 1 cm apart, one above the
other, are given equal but opposite charges so that a uniform,
upward electric field of 2kN/C exists in the space between them. A
particle with a mass of 2e-16 kg and a charge of 1 microC leaves
the bottom plate at 0.1 Mm/s at an angle of 30 degrees relative to
the horizontal. What horizontal displacement does the particle
experience before landing?
b) The charged particle in the previous...

Two horizontal, parallel conductors are connected to each other
at the left end via an ammeter of internal resistance of r = 2 Ω. A
conductor of length L = 0.5 m, resistance R = 8 Ω and mass m = 5 kg
can slide (no friction) along the horizontal rails. The whole
system is inside a uniform magnetic field of magnitude 2 T and
direction perpendicular to the plane formed by the two parallel
conductors (i.e., pointing into the...

1.A horizontally suspended 3.0 m track for fluorescent lights is
held in place by two vertical beams that are connected to the
ceiling. The track and lights jointly weigh 40 N. One beam is
attached 20 cm from one end of the track and the other beam is
attached 50 cm from the opposite and of track. What upward force
does each beam apply to the track?
2.Three 5.0 kg spheres are distributed as follows. Sphere A is
located at...

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