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. What is the ordere7p 6fdmmh1+o4)gy r w of magn6h yr)7o4+mewd1g mpf 5mp/vo c 7 4+:ffn(v2ytkvngw itude of the ratio between the mass of the car to that of the p5nm gcyf2o47t/v+ fv vnw(k:mouse?

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 g)g 6 fbxeu/.wsoi,1 mg:b)jemfnn+2y rams first, by multiplying by 1000 . The ratio is the mass of the c)gxnb )bme61 :m,wjs /u2.eynfog+ fiar divided by the mass of the mouse: $$ \frac{1000 \times 1000}{10}=100000 $$ As $100000=10^5$, the order of magnitude is 5 .