FIGURE 4-1
-In Fig. 4-1 the scale at left is attached to the ceiling and a mass of 1.00 kg hangs from it. It reads 9.81 N. The identical scale at the right is connected by perfect strings passing over perfect pulleys to two 1.00 kg masses hanging vertically at the end of the strings. The scale at right reads
A)exactly 9.81 N.
B)more than 9.81 N, but not quite twice as much.
C)less than 9.81 N.
D)exactly 19.62 N.
E)more than 19.62 N.

Question

FIGURE 4-1 
-In Fig. 4-1 the scale at left is attached to the ceiling and a mass of 1.00 kg hangs from it. It reads 9.81 N. The identical scale at the right is connected by perfect strings passing over perfect pulleys to two 1.00 kg masses hanging vertically at the end of the strings. The scale at right reads
A)exactly 9.81 N. 
B)more than 9.81 N, but not quite twice as much. 
C)less than 9.81 N. 
D)exactly 19.62 N. 
E)more than 19.62 N.

Quizplus · Accepted Answer

The tension in each string is 9.81 N, so the scale at right reads 2(9.81 N) = 19.62 N.

FIGURE 4-1 -In Fig. 4-1 the Scale at Left Is Attached to Is