试题与答案

(14分)如图甲所示,电荷量为q=1×10-4C的带正电的小物块置于绝缘水平面上

题型:计算题

题目:

(14分)如图甲所示,电荷量为q=1×10-4C的带正电的小物块置于绝缘水平面上,所在空间存在方向沿水平向右的电场,电场强度E的大小与时间t的关系如图乙所示,物块运动速度v与时间t的关系如图丙所示,取重力加速度g=10m/s2。求:

(1)前2秒内电场力做的功;

(2)物块的质量;

(3)物块与水平面间的动摩擦因数。

答案:

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