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. Whhx 0:kduvdmgj77ej ) 0+ca0gkivea. :6nkinh 7/jcqaof qd o;: 3r(h3at is the order of magnitude of the ratio between the mass of the car caaodqi;r:/ q7ji (f v.:6ne hokhn33 to that 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 muqr4 w(t rb91l8ejal3rst be converted to grams first, by multiplying by 1000 . The ratio is the massrtr4 1 qrb9w(j 8all3e 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 .