题目内容

【题目】听下面一段对话,完成五道小题,每小题填写一个词这段对话你将听两遍。

【答案】

(1) Dickenson

(2) cash

(3) 13:45

(4) UA9805

(5) claim/collect

【解析】听力原文:

M: American Airlines, good morning. May I help you?

W: Yes, do you have any flight to New York this Wednesday afternoon?

M: One moment, please... Yes. There's a flight at 13:45 and another at 1:00.

W: That's fine. Could I make a reservation now?

M: Certainly. Which flight would you like?

W: The 13:45, please.

M: Could I have your name, please?

W: Mary Dickenson, D-I-C-K-E-N-S-O-N. And my ID No. is N10789662.

M: How would you like to pay, Ms. Dickenson? It is $280.

W: I will pay in cash. Can I pay at the check-in desk when I pick up my ticket?

M: Yes, but you will have to claim your ticket at the check-in desk at least 3 hours before departure time.

W: I see.

M: The flight leaves at 13:45, Wednesday, and your arrival in New York will be at 6:25 a.m., local time. The flight number is UA9805.

W: Thank you.

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【题目】某同学把附有滑轮的长木板放在实验桌上,将细绳一端拴在小车上,另一端绕过定滑轮,挂上适当的钩码,使小车在钩码的牵引下运动,以此定量探究绳拉力做功与小车速度变化的关系,此外还准备了打点计时器及配套的电源、导线、复写纸、纸带、小木块等。组装的实验装置如图所示。

(1)若要完成该实验,必需的实验器材还有哪些 ? _________________

(2)实验开始时,他先调节木板上定滑轮的高度,使牵引小车的细绳与木板平行,他这样做的目的是下列的哪个(

A.避免小车在运动过程中发生抖动

B.可使打点计时器在纸带上打出的点清晰

C.可以保证小车最终能够实现匀速直线运动

D.可在平衡摩擦力后使细绳拉力等于小车受的合力

(3)平衡摩擦力后,当他用多个钩码牵引小车时,发现小车运动过快,致使打出的纸带上点数较少,难以选到合适的点计算小车速度,在保证所挂钩码数目不变的条件下,请你利用本实验的器材提出一个解决办法:______________________________

(4)他将钩码重力做的功当作细绳拉力做的功,经多次实验发现拉力做功总是要比小车动能增量大一些,这一情况可能是下列哪些原因造成的

A.在接通电源的同时释放了小车

B.小车释放时离打点计时器太近

C.阻力未完全被小车重力沿木板方向的分力平衡掉

D.钩码匀加速运动,钩码重力大于细绳拉力

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