问题
选择题
He _____ to school yesterday. [ ]
A. go
B. went
C. goes
D. going
答案
答案:B
He _____ to school yesterday. [ ]
A. go
B. went
C. goes
D. going
答案:B
物理小组探究“弹簧的伸长量与其受到拉力的关系”的实验装置如图甲所示.
(1)弹簧下悬挂50g的物体,物体静止时,弹簧受到的拉力是______N(g取10N/kg).
(2)探究过程中,实验数据如下表,请在图乙中作出弹簧的伸长量与其受到的拉力的关系图线.
悬挂物质量/g | 0 | 50 | 100 | 150 | 200 | 250 |
弹簧伸长量/cm | 0 | 1 | 2 | 3 | 4 | 5 |
(4)由图线得出,弹簧的伸长量和其受到的拉力成______.