Consider the following. (a) A 8.0 kg salami is supported by a cord that runs to
ID: 1878302 • Letter: C
Question
Consider the following.
(a) A 8.0 kg salami is supported by a cord that runs to a spring scale, which is supported by another cord from the ceiling (figure (a)). What is the reading on the scale, which is marked in SI weight units? (This is a way to measure weight by a deli owner.)
N
(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? (This is the way by a physics major.)
N
(c) In figure (c) the wall has been replaced with a second 8.0 kg salami on the left, and the assembly is stationary. What is the reading on the scale? (This is the way by a deli owner who was once a physics major.)
N
Explanation / Answer
a) W = mg = 8.0kg * 9.8m/s²
= 78.4 N
b) Here tension is the same in each case it is due to the fact it is exactly balancing the weight it is not important how the rope is attached.
c) same