Respuesta :
Answer:
42 km/h was the average speed of the car for its three-hour trip.
Explanation:
Diameter of the car wheel = d = 0.4 m
Radius of the car wheel = r = 0.5 d = 0.5 × 0.4 m =0.2 m
Distance covered in 1 complete revolution = [tex]2\pi r[/tex]
Distance covered in 100,000 complete revolution,D = [tex]2\pi r\times 100,000[/tex]
[tex]D=2\times 3.14\times 0.2 m\times 100,000=125,663.71 m[/tex]
1 m = 0.001 km
125,663.71 m = 125,663.71 × 0.001 km = 125.66371 km
Time taken to complete 100,000 revolution by a wheel = t = 3 hours
Speed of car : S
[tex]S=\frac{125.66371 km}{3hours}=41.89 km/h\approx 42 km/h[/tex]
42 km/h was the average speed of the car for its three-hour trip.
Answer:
Explanation:
diameter = 0.4 m
Radius, r = 0.2 m
Time, t = 3 hour
number of revolutions, = 100,000
Distance traveled in one revolution = 2 x π x r = 2 x 3.14 x 0.2 = 1.256 m
Total distance in 100,000 revolutions,
d = 100,000 x 1.256 = 125600 m
d = 125.6 km
Average speed = distance / time
Average speed = 125.6 / 3 = 41.87 km/h
