A cross-country skier can complete a 7.5 km race in 45 min. What is the skier’s average speed? km/h
2 answers:
<u>Answer:</u> The average speed of the skier is 10 km/hr.
<u>Explanation:</u>
Average speed is defined as the ratio of total distance traveled to the total time taken.
Mathematically,
We are given:
Total distance traveled = 7.5 km
Total time taken = 45 min = (Conversion factor: 1 hr = 60 min)
Putting values in above equation, we get:
Hence, the average speed of the skier is 10 km/hr.
You might be interested in
Answer:
<em>20 Liters</em>
Explanation:
If the pressure is supposed to be constant, one of Charles - Gay Lussac's laws can be used to solve the exercise. His statement says that "the volume of the gas is directly proportional to its temperature at constant pressure", mathematically it would be:
Considering T₁ = 50 ° C; V₁ = 10.0 L; and T₂ = 100 ° C, we can calculate the volume V₂ Clearing it from the equation and replacing the values to perform the calculation:
V2= (V1 x T2) / T1 = (10.0 L x 100°C) / 50 °C = 20 L
Therefore, <em>the gas at 100 ° C will occupy a volume of 20.0 L</em>.