An outstretched arm of a person is held at an angle theta= 26 deg below the horizon and a 18.5 N weight is placed on the hand. The shoulder-to-elbow length is 27 cm and the elbow-to-wrist length is 20 cm. The center of the weight is 5.5 cm from the person's wrist. An outstretched arm of a person is held at an angla. Determne the magnitude of the torque about the elbow produced by the weight. b. Determine the magnitide of the torque about the shoulder produced by the weight

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Ithink the answer would be a 

Lexy is correct because angle r is between the incident wave,  n  = 0, and a diffracted wave.

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