Concepts Of Physics MCQ Edition [Volume 1]PhysicsIntroduction to Physics
The average speed of a snail is 0.020 miles/hour, whereas that of a leopard is 70 miles/hour. Determine these speeds in SI units.
Options
- A0.89 m/s , 310 m/s
- B0.0055 m/s , 19 m/s
- C0.032 m/s , 112 m/s
- D0.0089 m/s , 31 m/s
Correct answer
D. 0.0089 m/s , 31 m/s
Step-by-step solution
The SI unit of speed is m/s . We know that 1 mile 1609 m and 1 hour = 3600 s . The conversion factor from miles/hour to m/s is 1609 3600 0.447 m/s . Speed of the snail = 0.020 miles/hour = 0.020 0.447 m/s 0.0089 m/s . Speed of the leopard = 70 miles/hour = 70 0.447 m/s 31 m/s .