Kognity IB Physics A.0 Measurements & Uncertainty (id: a7f97d4b5)

[单选题]
A car has a mass of 1000kg. A mouse has a mass of 10g. Wie kf,0,t 8cxzhat is the6e 6v d2*w+c/o :b sdqpibhjg2 order of magnitude of the ratio between the mass of the car to that of the mdb/ wp 22 ibh js:*v6eqoc6+gdouse?

A. -5
B. 5
C. $10^{-5}$
D. 100000


参考答案:  B


本题详细解析:
The mass of the car must be converted to grams first, by multiplying by 1cqt6d : yckq(2000 . The ratio is :ykq d6 q(tc2cthe mass of the car divided by the mass of the mouse: $$ \frac{1000 \times 1000}{10}=100000 $$ As $100000=10^5$, the order of magnitude is 5 .