Question

answer two questions about the highlighted segment.

1. which feature of the graph corresponds to the highlighted segment?

choose 1 answer:
a midline
b amplitude
c period

1. what is the meaning of the highlighted segment?

choose 1 answer:
a the mill completes 8 cycles in a second.
b the length of the blade is 8 meters.
c the mill’s center is 8 meters above the ground.
d the mill completes a single cycle in 8 seconds.

Explanation:

Question 1

• Midline is a horizontal line, but the highlighted segment is vertical, so A is wrong.
• Amplitude is the vertical distance from the midline to a peak or trough. The highlighted segment is vertical, likely representing amplitude (distance from midline to trough here).
• Period is horizontal (time for one cycle), so C is wrong.

• Option A: 8 cycles per second would relate to frequency, not the highlighted segment (amplitude - related to length/distance).
• Option B: Amplitude (highlighted) can represent the blade length (distance from center to tip, so from midline to trough/peak). If the highlighted segment's length is 8 (from midline to trough, e.g., midline at 0, trough at -4? Wait, maybe midline is 4? Wait, the graph: the vertical segment from midline (maybe y=4) to trough (y=-4)? Wait, no, the pink arrow: if midline is 4, and trough is -4? No, the y - axis has 0, 2, 4, 6, 8, 10, 12 and -2, -4. Wait, the highlighted segment: from midline (maybe y=4) to trough (y=-4)? No, the arrow is from midline (horizontal line) to trough? Wait, no, the pink arrow is vertical, from the midline (horizontal) to the trough. Wait, the options: B says "The length of the blade is 8 meters" – amplitude is the distance from center (midline) to tip (peak or trough), so if the vertical segment (amplitude) is 8 (from midline to trough, e.g., midline at 4, trough at -4? No, 4 to -4 is 8? Wait, 4 - (-4)=8. So the blade length (distance from center to tip) would be the amplitude.
• Option C: Midline would be the center's height, not the amplitude segment.
• Option D: Period is time for one cycle, horizontal, not vertical.

Answer:

B. Amplitude

Question 2