某同學在“用打點計時器測速度”的實驗中，用打點計時器記錄了被小車拖動的紙帶的運動情況，在紙帶上確定出A，B，C...

問題詳情：

某同學在“用打點計時器測速度”的實驗中，用打點計時器記錄了被小車拖動的紙帶的運動情況，在紙帶上確定出A，B，C，D，E，F，G共7個計數點.相鄰計數點間的距離如圖所示，每兩個相鄰的計數點之間的時間間隔爲0.10 s.(本題計算結果均保留3位有效數字)

(1) 在實驗中，使用打點計時器時應先            (選填“釋放紙帶”或“接通電源”).

(2) 每兩個計數點間還有          個點沒有標出.

(3) 試根據紙帶上各個計數點間的距離，每隔0.10 s測一次速度，計算出打下D點時小車的瞬時速度，並將各個速度值填入下表.

(4)將B、C、D、E、F各個時刻的瞬時速度標在直角座標系中，並畫出小車的瞬時速度隨時間變化的關係圖線.

【回答】

 (1)接通電源······································································································ (2分)

(2)4·········································································································· (2分)

(3)0.560··································································································· (3分)

(4)圖略····································································································· (3分)

知識點：（補充）勻變速直線運動規律的應用

題型：實驗,探究題