- #1
prettyinpink
- 16
- 0
A playground carousel is free to rotate about its center on frictionless bearings, and air resistance is negligible. The carousel itself (without riders) has a moment of inertia of 120 kgm2. When one person is standing at a distance of 1.40 m from the center, the carousel has an angular velocity of 0.500 rad/s. However, as this person moves inward to a point located 0.740 m from the center, the angular velocity increases to 0.640 rad/s. What is the person's mass?
A wrecking ball (weight = 4500 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3100 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32°, and the angle between the boom and the horizontal is 48°.
(a) Find the tension in the support cable.
(b) Find the magnitude of the force exerted on the lower end of the boom by the hinge at point P.
For the first problem I tryed doing IW=IW and didn't get the right answer.
For the seconde problem i understand the froces i just don't know how to put them into the equation. (https://www.physicsforums.com/showthread.php?p=811650)
A wrecking ball (weight = 4500 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3100 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32°, and the angle between the boom and the horizontal is 48°.
(a) Find the tension in the support cable.
(b) Find the magnitude of the force exerted on the lower end of the boom by the hinge at point P.
For the first problem I tryed doing IW=IW and didn't get the right answer.
For the seconde problem i understand the froces i just don't know how to put them into the equation. (https://www.physicsforums.com/showthread.php?p=811650)