(a) A 4.28 kg salami is supported by a cord that runs to a spring scale, which i
ID: 2166830 • Letter: #
Question
(a) A 4.28 kg salami is supported by a cord that runs to a spring scale, which is supported by another cord from the ceiling (see Figure (a)). What is the reading on the scale, which is marked in weight units? (b) In Figure (b) the 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? (c) In Figure (c) the wall has been replaced with a second 4.28 kg salami on the left, and the assembly is stationary. What is the reading on the scale now?
Explanation / Answer
The reading is zero because I was hungry and ate the salami! Seriously, if at all possible, post the figures, it is hard to help you just using the descriptions. Added: For the first one it is just the full weight or 1.04Kg. For the second one, I am assuming you have a cord going horizontally from a wall, connected to a scale, then, from the scale a cord goes over a pulley and the salami is hanging verticaly; this would still be 1.04 Kg. For the last one it is a little hard to tell what the configuration is, but if it is a 1.04 kg salami hanging vertically on the left, the cord goes upwards over a pulley and down the other side to a scale and the other end of the scale has a cord to another 1.04kg salami also hanging vertically, it would still read 1.04 kg. Whether you hold the scale with a ceiling, wall, or another salami, it doesn't affect the weight.
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