Physics Unit26: Special Theory of Relativity (id: a2242bed4)

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本题目来源于试卷: Physics Unit26: Special Theory of Relativity，类别为 Generic Physics

[单选题]
A spear is thrown by f uups7 0z(dsq7th .+q cmr35syou at a very high speed. As it passe d)2 )jtumfm),j+ rzzrs, you measure its length at one-half its normal length. From tjf mj2rmrdu )z)z)+ ,this measurement, you conclude that 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