SAT Subject Physics Practice Question 659: Answer and Explanation

Next steps

Question: 659

10. Water drips from a leaky rainspout that is located at the top of a high building. The droplets of water fall at an interval of 1/2 second. As time passes, the distance between two consecutive drops of water

A. decreases in a linear manner.
B. increases in a linear manner.
C. remains the same.
D. decreases in a parabolic manner.
E. increases in a parabolic manner.

Correct Answer: B

Explanation:

The correct answer is (B). Assume at t=0, first drop starts to fall.
So, its distance from the rainspout, h1= 0.5 g t2

At t = 0.5 s, next drop starts to fall.
So, its distance from the rainspout, h2= 0.5 g (t – 0.5)2

Separation between them at any time t = h1–h2
= 0.5 g [t2– (t – 0.5)2]
= 0.25 g (2t – 0.5)

So, it increases in a linear manner.

Previous       Next