本题目来源于试卷: Physics Unit26: Special Theory of Relativity，类别为 通用国际物理
[单选题]
A spear is thrown by youeoj isr)870 bk at a very ho nn27hy(mj;wkc: g-*+ a scvx t4krm3igh speed. As it passes, you measure its length at one-half its normal length. From this measurement, you conclude th c yc3mwm2n+r:jvk;t7 *gaxsh 4(k-noat the moving spear's mass must be
A. one-half its rest mass.
B. twice its rest mass.
C. four times its rest mass.
D. none of the given answers
参考答案: B
本题详细解析:
暂无
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