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

[单选题]
A car has a mass of 1000kg. Ayi.nt*h )tcjrgf 6dau3 i./9g *zf+jqiwki/o6+wt mt*1 yn;uo.sd 1rkjb +-mmouse has a mass of 10g. What is the order of magnitude of the ratio between the mass of the car to nm- *ot/6+ t k+f11w.q+; umsd r*ijkjy izbowthat of the 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 md 2rg:c o)2ofwy+f(k just be converted to grams first, by multiplying by 1000 . Thc+) y ofog2:2( jdfrkwe ratio is the 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 .