**Give an order-of-magnitude estimate for the length in meters of the following: (a) a person; (b) a fly;
( c) a car; (d) a 747 airplane; (e) an interstate freeway stretching coast-to-coast.**

**Answer:**

**(a)**

The average height of a typical person is around 1.80 m.

Thus, the order of magnitude in meters to the nearest power of 10 is **1m**

**(b)**

The length of the fly is around

Thus, the order of magnitude in meters to the nearest power of 10 is

**( c)**

The length of the car is in between **6m and 11m**

Thus, the order of magnitude in meters to the nearest power of 10 is **10m.**

**(d)**

The length of 747 airplane is about 100 m

Thus, the order of magnitude in meters to the nearest power of 10 is **100m.**

**(e)**

The length of the interstellar freeway is about .

Thus, the order of magnitude in meters to the nearest power of 10 is