5. Where are the two speakers going?
A. To a birthday party. B. To a department store. C. To Lily’s school.
4. What does the woman want the man to do?
A. To go to Alice’s birthday party with her.
B. To tell her when Alice’s birthday
is.
C. To buy her a birthday present.
Conversation 3
3. When is the woman’s birthday?
A. Tomorrow. B. The day after tomorrow. C. In two weeks.
2. What can we learn from the conversation?
A. The man’s brother speaks very good Chinese.
B .The man wants to learn some Chinese.
C. The woman is learning Chinese.
Conversation 2
1. What is in the man’s hand?
A. An old English-Chinese dictionary.
B. A new English-Chinese dictionary. .
C. A new Chinese-English dictionary.
8.如图所示,光滑斜面长为a,宽为b,倾角为θ。一物块沿斜面上方顶点P水平射入,而从右下方顶点Q离开斜面,求物块入射的初速度为多少?
7.在离地面高为h,离竖直光滑墙的水平距离为s1处,有一小球以v0的速度向墙水平抛出,如图所示。小球与墙碰撞后落地,不计碰撞过程中的能量损失,也不考虑碰撞的时间,则落地点到墙的距离s2为多少?
6. 如图所示,点光源S距墙MN的水平距离为L,现从O处以水平速度v0平抛一小球P,P在墙上形成的影是P',在球做平抛运动过程中,其影P'的运动速度是多大?
5.飞机以恒定的速度v沿水平方向飞行,高度为2000m。在飞行过程中释放一枚炸弹,经过30s后飞行员听见炸弹落地的爆炸声。假设此爆炸向空间各个方向的传播速度都为330m/s,炸弹受到的空气阻力可以忽略,求该飞机的飞行速度v?
4.如图所示,飞机离地面高度为H=500m,水平飞行速度为v1=100m/s,追击一辆速度为v2=20 m/s同向行驶的汽车,欲使炸弹击中汽车,飞机应在距离汽车的水平距离多远处投弹?(g=10m/s2)
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