FIGURE 6-13
-Refer to Figure 6-13. Block A has a mass of 5.00 kg, block B has a mass of 3.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the tension in the string connecting blocks A and B?
A) 13.7 N
B) 20.6 N
C) 34.3 N
D) 25.5 N
E) 38.3 N

Question

FIGURE 6-13 
-Refer to Figure 6-13. Block A has a mass of 5.00 kg, block B has a mass of 3.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the tension in the string connecting blocks A and B?
A) 13.7 N 
B) 20.6 N 
C) 34.3 N 
D) 25.5 N 
E) 38.3 N

Quizplus · Accepted Answer

Since the pulleys are ideal, the tension in the string is constant throughout. 
Therefore, the tension in the string connecting blocks A and B is equal to the weight of block A plus the weight of block B, which is (5.00 kg + 3.00 kg) x 9.81 m/s² = 78.6 N. 
Thus, choice C, 34.3 N, is the tension in the string connecting blocks A and B.

FIGURE 6-13 -Refer to Figure 6-13. Block a Has a Mass of a Mass