Passage II

An object is dropped from a height H above the top of a spring, compressing it. The top of the spring is a distance y below its initial position (see Figure 1) when the spring begins its rebound. At that moment, the object has its maximum upward acceleration, a.

Figure 2 shows, for each of 3 springs—Spring X (the least stiff spring), Spring Y, and Spring Z (the stiffest spring)—a graph of the ratio versus H; g is the acceleration due to gravity.

7. Suppose that another spring, Spring W, is tested using the same procedures as those used with the other 3 springs; assume that the stiffness of Spring W is much greater than that of Spring X, Y, or Z. Based on Figure 2, for H = 4.0 m, will most likely be:

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

First of all, according to the second paragraph of the article, the greater the stiffness, the greater the ordinate a/g should be.

According to the question stem, it can be seen that the stiffness of Spring W is greater than that of Spring Z, so corresponding to figure 2, the curve of Spring W should be above Spring Z. So when the abscissa H=4.0 m, the ordinate a/g should be greater than the ordinate of Spring Z at this time, that is, greater than 5.0