A 370 kg mass is supported on a wire attached to a 15 m long steelbar that is pivoted at a vertical wall and supported by a cable.The mass of the bar is 75 kg. (Take right and up to bepositive.)
(a) With the cable attached to the bar 5.0 m from the lower end asshown, find the tension in the cable.
? N
Find the force exerted by the wall on the steel bar.
? N i + ? N j
(b) A somewhat longer cable replaces the old and is attached to thesteel bar 5.0 m from its upper end, connecting to the same place onthe wall as before and maintaining the same angle between the barand the wall. Find the tension in the cable.
? N
Find the force exerted by the wall on the steel bar.
? N i + ? N j
A 370 kg mass is supported on a wire attached to a 15 m long steelbar that is pivoted at a vertical wall and supported by a cable.The mass of the bar is 75 kg. (Take right and up to bepositive.)
(a) With the cable attached to the bar 5.0 m from the lower end asshown, find the tension in the cable.
? N
Find the force exerted by the wall on the steel bar.
? N i + ? N j
(b) A somewhat longer cable replaces the old and is attached to thesteel bar 5.0 m from its upper end, connecting to the same place onthe wall as before and maintaining the same angle between the barand the wall. Find the tension in the cable.
? N
Find the force exerted by the wall on the steel bar.
? N i + ? N j
Related textbook solutions
Related questions
A uniform steel beam of length 
and mass 
is attached via a hinge to the side of a building. The beam is supported by a steel cable attached to the end of the beam at an angle 
, as shown. Through the hinge, the wall exerts an unknown force, 
, on the beam. A workman of mass 
sits eating lunch a distance 
from the building.
| Part A | |
|---|---|
|
Find
 , the tension in the cable. Remember to account for all the forces in the problem |
|
Part B
Find 
, the x-component of the force exerted by the wall on the beam ( ), using the axis shown. Remember to pay attention to the direction that the wall exerts the force.
