december 4 ap physics. homework check in: how can you use the idea of torque to lift something...
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December 4
AP Physics
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Homework check
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In:
How can you use the idea of torque to lift something heavy?
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Objective:
To practice the concept of Torque and rotational equilibrium.
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Rotational Equilibrium
Three equations:
ΣFx=0
ΣFy=0
ΣT=0
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A uniform semicircular sign 1.00 m in diameter and of weight w is supported by two wires as shown in Figure P8.21. What is the tension in each of the wires supporting the sign?
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One end of a uniform 4.0-m-long rod of weight w is supported by a cable. The other end rests against a wall, where it is held by friction. The coefficient of static friction between the wall and the rod is μs = 0.50. Determine the minimum distance x from point A at which an additional weight w (the same as the weight of the rod) can be hung without causing the rod to slip at point A.
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What is the force at 80 cm?
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Where do you put the fulcrum?
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A 20.0-kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole, as shown. A cable at an angle of 30.0° with the beam helps to support the light. Find
(a) the tension in the cable and
(b) the horizontal and vertical forces exerted on the beam by the pole.
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Out:If the rock has a mass of 1000 kg, and the man can provide a force of500 N, how long a lever arm should he use on his side if the rock side has a distance of .5 m?