(1)由图示螺旋测微器可知,金属丝直接为2.5mm+45.0×0.01mm=2.950mm;
(2)由纸带可知,OA=10.80cm=0.1080m,CD=OD-OC=43.20cm-30.00cm=13.20cm=0.1320m,
计数点间的时间间隔t=0.02×5=0.1s,CD-OA=2at 2,木块下滑的加速度a=2.40m/s 2;
故答案为:(1)2.950(2.948-2.951均正确)(2)2.40.
(1)由图示螺旋测微器可知,金属丝直接为2.5mm+45.0×0.01mm=2.950mm;
(2)由纸带可知,OA=10.80cm=0.1080m,CD=OD-OC=43.20cm-30.00cm=13.20cm=0.1320m,
计数点间的时间间隔t=0.02×5=0.1s,CD-OA=2at 2,木块下滑的加速度a=2.40m/s 2;
故答案为:(1)2.950(2.948-2.951均正确)(2)2.40.