(a) $\text{27}\text{.}\text{8 m/s}$

(b) $\text{62}\text{.}\text{1 mph}$

$\frac{\text{1.0 m}}{\mathrm{s}}=\frac{1\text{.}\text{0 m}}{\mathrm{s}}\times \frac{\text{3600 s}}{\text{1 hr}}\times \frac{\mathrm{1\; km}}{\text{1000 m}}$

$=3\text{.}\text{6 km/h}$.

length: $\text{377 ft}$; $4\text{.}\text{53}\times {\text{10}}^3\text{ in}\text{.}$ width: $\text{280 ft}$; $3\text{.}3\times {\text{10}}^3\text{ in}$.

$8\text{.}\text{847 km}$

(a) $1\text{.}3\times {\text{10}}^{-9}\text{ m}$

(b) $\text{40 km/My}$

2 kg

(a) $85\text{to 95}\text{km/h}$

(b) $53\text{to 59}\text{mi/h}$

(a) $7\text{.}6\times {\text{10}}^7\text{ beats}$

(b) $7\text{.}\text{57}\times {\text{10}}^7\text{ beats}$

(c) $7\text{.}\text{57}\times {\text{10}}^7\text{ beats}$

(a) 3

(b) 3

(c) 3

(a) $2\text{.}2\text{\%}$

(b) $\text{59 to 61 km/h}$

$\text{80}\pm 3\text{beats/min}$

$2\text{.}8\text{h}$

$\text{11.4}\pm 0.6{\text{cm}}^3$

$\text{12}\text{.}\text{06}\pm 0\text{.}\text{04}{\text{m}}^2$

Sample answer: $2\times {\text{10}}^9$ heartbeats

Sample answer: $2\times {\text{10}}^{\text{31}}$ if an average human lifetime is taken to be about 70 years.

Sample answer: 50 atoms

Sample answers:

(a) ${\text{10}}^{\text{12}}$ cells/hummingbird

(b) ${\text{10}}^{\text{16}}$ cells/human