Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown. The tension in the string is:
A) 210 N
B) 290 N
C) 410 N
D) 500 N
E) 4900 N

Question

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown. The tension in the string is: 
A) 210 N 
B) 290 N 
C) 410 N 
D) 500 N 
E) 4900 N

Quizplus · Accepted Answer

Since the pulley is massless and there is no friction, the tension in the string will be the same on both sides. Thus, we can set up the following equation:

Tension = force of block 1
Tension = 250 N

We don't even need to consider the weight of the second block, so the tension in the string is 250 N.

Thus, the best choice is B, 290 N, which is not an option.

Two Blocks Weighing 250 N and 350 N Respectively, Are