Question

（1）利用圖1所示的裝置研究小車加速度a和小車質(zhì)量M的關(guān)系時，由于沒有始終滿足M＞＞m（m為小盤及砝碼的總質(zhì)量）的條件，結(jié)果得到的圖象應(yīng)是如圖2中的圖                                                         

（2）某同學(xué)設(shè)計了如下實(shí)驗方案：                                                                            

A．實(shí)驗裝置如圖甲所示，一端系在滑塊上的輕質(zhì)細(xì)繩通過轉(zhuǎn)軸光滑的輕質(zhì)滑輪，另一端掛一重力為3.3N的鉤碼，用墊塊將長木板的有定滑輪的一端墊起．調(diào)整長木板的傾角，直至輕推滑塊后，滑塊沿長木板向下做勻速直線運(yùn)動；                                                                                                                                

B．保持長木板的傾角不變，取下細(xì)繩和鉤碼，接好紙帶，接通打點(diǎn)計時器的電源，然后讓滑塊沿長木板滑下，打點(diǎn)計時器打下的紙帶如圖乙所示．                                                                                           

請回答下列問題：                                                                                                      

（a）圖乙中紙帶的哪端與滑塊相連？                                                          （選填“左端”或“右端”）．            

（b）圖乙中相鄰兩個計數(shù)點(diǎn)之間還有4個打點(diǎn)未畫出，打點(diǎn)計時器接頻率為50Hz的交流電源，根據(jù)圖乙求出滑塊的加速度a=                                                                                                                m/s²．     

（c）不計紙帶與打點(diǎn)計時器間的阻力，滑塊的質(zhì)量M=                               kg．（g取10m/s²）         

                        

                                                                                                                                  

Answer 1

（1）D；  （2）（a） 右端；（b）  1.65；（c）2．