(a) A 6.5 kg salami is supported by a cord that runs to a spring scale, which is

Question

(a) A6.5kg salami is supported by a cord that runs to a spring scale, which is supported by another cord from the ceiling (Fig. 5-34a). What is the reading on the scale?
N
(b) In Fig. 5-34bthe salami is supported by a cord that runs around a pulley and to a scale. The opposite end of the scale is attached by a cord to a wall. What is the reading on the scale?
N
(c) In Fig. 5-34cthe wall has been replaced with a second6.5kg salami on the left, and the assembly is stationary. What is the reading on the scale now?
N

Explanation / Answer

follow this solved example W=m(g+a) Where "a" represents the accleration of the object in thevertical direction and m is mass of object. Sign of "a" can be +veor -ve depending on the direction of accleration being upwardor downward repectively. Now, for the given problem, Case1: When the person is at rest- Clearly, a=0 here. Hence, W=75*10=750 N. Case2: When the person is moving at a constant velocity In this case too, since the person is moving at constantvelocity, a=0. Hence, we get W=750 N again. Case3: when the person is acclerating upwards with accleration2m/s2 In this case, a=2 m/s2 Hence, W=75*(10+2)=75*12=900 N. In all the three cases, W represents the weight of theperson.

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