1. “War of the Worlds” Broadcast (1938)
Exam next Wednesday

2. Conversions Florence Griffith-Joyner holds the women’s 100.m world
record, finishing in seconds. What was her
speed in miles per hour? (1 mile = 5280 ft)
What do I know?
100.m = s, 60s = 1 min, 60 min = 1hr
1 cm = 1x10-2 m, 1 in = cm,
12 in = 1 ft, 1 mile = 5280 ft

3. What is my mass in lbs. if this morning I weighed 103,873 g. (1 kg = 2
What is my mass in lbs. if this morning I weighed 103,873 g? (1 kg = 2.20 lb.)
What is given (including units)?
103,873 g
1 kg = 2.20 lb.
What are you asked for (including units)?
mass in lbs.
What other information do you know?
1x103 g = 1 kg
Where do you start? What is your game plan?
103,873 g
 kg  lb
 kg

4. What is my mass in lbs. if this morning I weighed 103,873 g. (1 kg = 2
What is my mass in lbs. if this morning I weighed 103,873 g? (1 kg = 2.20 lb.)
g  kg  lb

5. Gold is amazing stuff!! A 1.50 cm3 piece of pure gold can be made into a single wire that stretches km in length (roughly the distance from here to Stockton). How long would that wire be in nanometers (nm)
What is given (including units)?
1.50 cm3
82.21 km
What are you asked for (including units)?
length in nm
What other information do you know?
1x103 m = 1 km 1x10-9m = 1 nm 1x10-2m = 1 cm
Where do you start? What is your game plan?
82.21 km
 m  nm
 m

6. Gold is amazing stuff!! A 1.50 cm3 piece of pure gold can be made into a single wire that stretches km in length (roughly the distance from here to Stockton). How long would that wire be in nanometers (nm)
82.21 km  m  nm

7. What is given (including units)?
The speed of light is 2.998x1010 cm per second. What is the speed of light in miles per hour. (1 mile = 5280 ft, 2.54 cm per inch)
What is given (including units)?
1 mile = 5280 ft
What are you asked for (including units)?
speed in
What other information do you know?
2.54 cm = 1 in 1 ft = 12 in mile = 5280 ft
1hr = 60 min 60 s = 1 min

8. Where do you start? What is your game plan?  in  ft  mi  in
The speed of light is 2.998x1010 cm per second. What is the speed of light in miles per hour. (1 mile = 5280 ft, 2.54 cm per inch)
Where do you start? What is your game plan?
 in  ft  mi
 in
 in  ft
 min
 min  hr

9. What is given (including units)?
It takes roughly minutes for the light from the Sun to reach the Earth. If light travels at x1010 cm per second, what is the distance in km from the Sun to the Earth?
What is given (including units)?
8.317 min
2.9979x1010 cm/s
What are you asked for (including units)?
distance in km
What other information do you know?
60 s = 1 min x10-2 m = 1 cm 1x103 m = 1 km
Where do you start? What is your game plan?
8.317 min
 s  cm  m
 s  cm  m  km
 s
 s  cm

10. It takes roughly minutes for the light from the Sun to reach the Earth. If light travels at x1010 cm per second, what is the distance in km from the Sun to the Earth?
8.317 min  s  cm  m  km