University physics章节测试课后答案2024秋

浙江理工大学

第一章单元测试

1. How many years older will you be 1.00 gigaseeond from now? (Assume a 365-day year.) （ ）

A:41.7 y B:31.7y C:21.7 y D:51.7 y
答案:31.7y

2. Scientific notation: （ ）

A: B: C: D:
答案:


3. In Δ ABC, we know that D is a point on the extension line of BC, and E is the midpoint of line segment AD. If , and , then x = （ ）.


A:1/3 B:1/4 C:−1/4 D:−1/3
答案:−1/4


4. Vector operation. If , and , find the value of , such that the vectors and will be perpendicular to each other （ ）.


A:-2/3 B:-4/3 C:-8/3 D:-5/3
答案:-4/3


5. Two displacement vectors,  and , have magnitudes S=3 m and T=4 m, which of the following could not be the magnitude of the difference vector? (There may be more than one correct answer.) （　   　）.


A:7 m B:9 m C:1 m D:5 m
答案:9 m

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