题目

如图1，质量M=1kg的木板静止在水平面上，质量m=1kg大小可以忽略的铁块静止在木板的右端．设最大摩擦力等于滑动摩擦力，已知木板与地面间的动摩擦因数μ1=0.1，铁块与木板之间的动摩擦因数μ2=0.4，取g=10m/s2．现给木板施加一个水平向右的力F．若力F从零开始逐渐增加，且木板足够长．试通过分析与计算，在图2中作出铁块受到的摩擦力f随力F大小变化的图象.GARDEN  RESTAURANTAddress: 9020 Bridgeport RoadOpen: Mon. to Fri. 7:00a.m. --- 2:30p.m.and 5:00 p.m. --- 9:00p.m.Sat. 7:00a.m. --- 11:00a.m. and 5:00p.m.--- 9:30p.m.Sun. 11:00a.m. --- 2:00p.m. and 5:00p.m.---9:30p.m.NEW YORK MUSEUMTelephone: 364431Address: Vanier Park, 1100 Chestnut St. New York America’s largest museum specializing in American history and part of our native people.Open: Mon. to Fri. 9:00a.m.---5:00p.m. (Monday free)Sat. 9:00a.m.---1:00p.m.LANSDOWNE PARK SHOPPING CENTERTELEPHONE: 3562367Address: 5300 NO.3 RoadOpen: Mon. Tues. and Sat. 9:30a.m. ---5:30p.m.Wed. Thurs. and Fri. 9:30a.m. ---9:30p.m.Sun. 11:00a.m. --- 5:00p.m.SKYLINE HOTELTelephone: 2785161Address: 3031 NO.3 Road ( at Sea island Way)The Hangar Den: Wed. to Sun. Lunch from 10:30a.m.Coffee Shop: Mon. --- Fri. 6:00a.m. ; Sat. 6:00a.m. and Sun. 7:00a.m. Mon. --- Wed. to 10:00p.m.; Thurs. --- Sun. to 11:00p.m.1.If you want to go out for lunch on Tuesday you can call up the number ________.A.2706630B.7364431C.3562367D.27851612.You do not have to pay on Monday if you go to ________.A.Skyline HotelB.Lansdowne Park Shopping CenterC.New York MuseumD.Garden Restaurant3.Suppose you want to buy some gifts for your friends, you can go to ________.A.3031 NO.3 RoadB.Vanier Park, 1100 Chestnut St.C.9020 Bridgeport RoadD.5300 NO.3 Road4.What can you do after 9:30p.m. on Sunday?A.Visit New York Museum.B.Do some shopping in Lansdowne Park shopping CenterC.Go to Garden RestaurantD.Go to the Coffee Shop of Skyline Hotel