-In the figure,a certain type of string will break if the tension in the string exceeds 300 N.A number of 8-kg weights are hung one below the other from a hook in the ceiling using this string.The number of weights that causes the string to break and the string segment that will break are as follows:
A)When the 4th weight is added,the top string segment will break.
B)Each segment has a tension of 78.4000015 N,and there is no limit to the number of weights that can be suspended.
C)When the 4th weight is added,the bottom string segment will break.
D)When the 4th weight is added,all string segments will break.
E)When the 38th weight is added,all string segments will break.

Question

-In the figure,a certain type of string will break if the tension in the string exceeds 300 N.A number of 8-kg weights are hung one below the other from a hook in the ceiling using this string.The number of weights that causes the string to break and the string segment that will break are as follows:
A)When the 4th weight is added,the top string segment will break. 
B)Each segment has a tension of 78.4000015 N,and there is no limit to the number of weights that can be suspended. 
C)When the 4th weight is added,the bottom string segment will break. 
D)When the 4th weight is added,all string segments will break. 
E)When the 38th weight is added,all string segments will break.

Quizplus · Accepted Answer

When the 4th weight is added, the top string segment will break.The tension in the string is equal to the weight of the weights hanging from it. When the 4th weight is added, the tension in the string will be 4 * 8 kg * 9.8 m/s^2 = 313.6 N, which is greater than the breaking strength of the string. Therefore, the top string segment will break.

-In the Figure,a Certain Type of String Will Break If