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Static Equilibrium (exam 3)

Static Equilibrium (exam 3) - Static Equilibrium Concept...

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Static Equilibrium Concept Questions Static Equilibrium Concept Tests CTSE-1. A mass m is hung from a clothesline stretched between two poles. As a result, the clothesline sags slightly as shown. The tension T in the clothesline has magnitude.. A) mg B) mg/2 C) slightly greater than mg/2 D) considerably greater than mg/2 E) considerably less than mg/2 Answer: the tension T in each half of the top cord is considerably greater than mg/2. The y-component of each tension vector must be T y = mg/2 , because the upward forces (2T y ) must cancel the downward forces (mg). If the angle of the clothesline is nearly horizontal, the T-vector must be very long in order for its y-component to be big enough to equal mg/2. CTSE-2. A door is pushed on by two forces, a smaller force at the door knob AND a larger force nearer the hinge as shown. The door does not move.

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The force exerted on the door by the hinge .... A) is zero B) points (along +y) C) points (along -y) D) points lower right E) points upper right Answer: The hinge must exert a force to the lower right. This must be so in order to have
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Static Equilibrium (exam 3) - Static Equilibrium Concept...

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