24. The hunter calmly picked up his gun,took the aim and fired, ______ the beast.
A.bringing down B.pulling down C.falling dowing D.putting down
23.Hearing that most of the members voted against her, she ______ a smiile.
A.wore B. managed C.performed trolled
22. It is a strange phenomenon that some young people today think it is their parents’responsibility to earn money and_______ to spend it.
A.them B.they C.their D.theirs
第一節(jié) 單項(xiàng)填空(共15小題;每小題1分,滿(mǎn)分15分)
從A、B、C、D四個(gè)選項(xiàng)中,選出可以填入空白處的最佳選項(xiàng)。
21.. Department of Homeland Security and CIA produced ______ joint report on Monday warning that ______ next 911 could in fact occur on ______ different date.
A.the; a; the B.a; the; a C./; the; the D.a; /; the
15、(10分)傾斜的傳送帶以v=10m/s的速度逆時(shí)針?lè)(wěn)定運(yùn)行,如圖所示,在傳送帶的上端A點(diǎn)輕輕的放上一個(gè)小物體,物體與傳送帶之間的動(dòng)摩擦因數(shù)為μ=0.5,傳送帶A點(diǎn)到下端B點(diǎn)的距離為L(zhǎng)=16m,傳送帶傾角為θ=370,求物體由A點(diǎn)運(yùn)動(dòng)到B點(diǎn)所需的時(shí)間是多少?(g=10m/s2,sin370=0.6,cos370=0.8)
k.s.5.u
深圳市高級(jí)中學(xué)2010-2011學(xué)年第一學(xué)期第一次測(cè)試
14、(10分)如圖(a)所示,質(zhì)量m=1kg的物體沿傾角θ=370的固定粗糙斜面由靜止開(kāi)始向下運(yùn)動(dòng),風(fēng)對(duì)物體的作用力沿水平方向向右,其大小與風(fēng)速v成正比,比例系數(shù)用k表示,物體加速度a與風(fēng)速v的關(guān)系如圖(b)所示。(已知sin370=0.6,cos370=0.8,g=10m/s2)。求:
(1)物體與斜面間的動(dòng)摩擦因數(shù)μ;
(2)比例系數(shù)k。
13、(8分)如圖所示,人重600N,木塊A 重400N,人與A、A與地面間的動(dòng)摩擦因數(shù)均為0.2,現(xiàn)人用水平力拉繩,使他與木塊一起向右做勻速直線運(yùn)動(dòng),滑輪摩擦不計(jì),求:
(1)人對(duì)繩的拉力;
(2)人腳對(duì)A的摩擦力的方向和大小。
12、(8分)從樓頂自由落下一個(gè)鉛球,通過(guò)1米高的窗子,用了0.1秒的時(shí)間,問(wèn)樓頂比窗臺(tái)高多少米?(g取10m/s2)
k.s.5.u
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