Question

A nonuniform beam 4.45 m long and weighing 1.08 kN makes an angle of 25 ∘ below the horizontal. It is held in position by a frictionless pivot at its upper-right end and by a cable a distance of 3.06 m farther down the beam and perpendicular to it (see Figure 11.31 in the textbook). The center of gravity of the beam is a distance of 1.97 m down the beam from the pivot. Lighting equipment exerts a downward force of 4.96 kN on the lower-left end of the beam. Find the tension T in the cable Find the vertical component of the force exerted on the beam by the pivot. Assume that the positive x and y axes are directed to the right and upward respectively Find the horizontal component of the force exerted on the beam by the pivot. Assume that the positive x and y axes are directed to the right and upward respectively.

Answer #1

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A nonuniform beam 4.44 m long and weighing 1.10 kN makes an
angle of 25 ? below the horizontal. It is held in position by a
frictionless pivot at its upper-right end and by a cable a distance
of 3.02 m farther down the beam and perpendicular to it (see Figure
11.31 in the textbook). The center of gravity of the beam is a
distance of 2.04 m down the beam from the pivot. Lighting equipment
exerts a downward force...

A hungry bear weighing 735 N walks out on a beam in an attempt
to retrieve a basket of goodies hanging at the end of the beam (see
the figure below). The beam is uniform, weighs 200 N, and is 5.00 m
long, and it is supported by a wire at an angle of θ =
60.0°. The basket weighs 80.0 N.
A horizontal plank is attached at the left end to a vertical
wall. A rod with a pulley...

A 1,100–N uniform boom at ϕ = 65.5° to the horizontal
is supported by a cable at an angle θ = 24.5° to the
horizontal as shown in the figure below. The boom is pivoted at the
bottom, and an object of weight w = 2,150 N hangs
from its top.
(a) Find the tension in the support cable.
(b) Find the horizontal & vertical components of the
reaction force exerted by the pivot on the boom. (Assume the
positive...

A 560-N uniform rectangular sign 4.00 m wide and 3.00 m high is
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indicated in the figure below. The left end of the rod is supported
by a hinge and the right end is supported by a thin cable making a
30.0° angle with the vertical. (Assume the cable is connected to
the very end of the 6.00-m-long rod, and that there are 2.00 m
separating the wall from the sign.)...

A person with weight 700 N stands d = 1.00 m away from
the wall on a ℓ = 9.00 m beam, as shown in this figure. The weight
of the beam is 5,000 N. Define upward as the positive y
direction and to the right as the positive x
direction.
(a) Find the tension in the wire. (Enter the magnitude only.)
N
(b) Find the horizontal component of the hinge force. (Indicate the
direction with the sign of your...

A beam of electrons is shot into a uniform downward electric
field of magnitude 1.10 103 N/C. The electrons have an initial
velocity of 1.01 107 m/s, directed horizontally. The field acts
over a small region, 5.00 cm in the horizontal direction. (a) Find
the magnitude and direction of the electric force exerted on each
electron. (b) How does the gravitational force on an electron
compare with the electric force? (c) How far has each electron
moved in the vertical...

Two boxes are stacked, with box B placed on top of box A. If box
A is pushed such that both boxes move with a decreasing speed, is
there any friction on either box?
(a) Kinetic friction on box A and no friction on box B (b)
Kinetic friction on box A and static friction on box B
(c) Kinetic friction on box A and kinetic friction on box B (d)
Static friction on box A and kinetic friction on...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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