question 19\nthe average speed of helium at 25°c is 1255 m/s. convert this speed to miles per hour (mph).
question 19\nthe average speed of helium at 25°c is 1255 m/s. convert this speed to miles per hour (mph).
Answer
Explanation:
Step1: Convert meters to miles
1 mile = 1609.34 meters. So, 1255 m = 1255÷1609.34 miles. $1255\div1609.34\approx0.78$ miles
Step2: Convert seconds to hours
1 hour = 3600 seconds. So, 1 second = 1÷3600 hours. The speed in m/s is converted to miles per hour by multiplying the number of miles by the number of seconds in an hour. The speed $v=\frac{0.78}{\frac{1}{3600}}$ miles per hour. $v = 0.78\times3600=2808$ miles per hour
Answer:
2808