(a) A 2.17 kg salami is supported by a cord that runs to a spring scale, which i
ID: 1654531 • Letter: #
Question
(a) A 2.17 kg salami is supported by a cord that runs to a spring scale, which is supported by another cord from the ceiling . 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 2.17 kg salami on the left, and the assembly is stationary. What is the reading on the scale now?
Explanation / Answer
(a)
string is attached from ceiling
Fnet = 0
R - W = 0
R = W = mg = 2.17*9.8 = 21.3 N
(b)
Fnet = 0
R - W = 0
R = W = mg = 2.17*9.8 = 21.3 N
(c)
Fnet = 0
R - W = 0
R = W = mg = 2.17*9.8 = 21.3 N
along vertical
displacement y = height = 12.7 ft = 12.7*0.3048 = 3.87 m
acceleration ay = -g = -9.8 m/s^2
initial velocity voy = vo*sin46
at the maximum final velocity vy = 0
vy^2 - voy^2 = 2*ay*y
0 - (v0*sin46)^2 = -2*9.8*3.87
v0 = 12.1 m/s <<<<<<===================ANSWER
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