A car moves at a speed of 80 km / h and a plane moves at 900 km / h, how many
| June 10, 2021 | education
A car moves at a speed of 80 km / h and a plane moves at 900 km / h, how many times each of them is less than the first cosmic speed.
Task data: Va (vehicle speed) = 80 km / h = 22.22 (2) m / s; Vs (aircraft speed) = 900 km / h = 250 m / s.
Constants: Vz1 (the first space velocity of the Earth) = 7919.6 m / s.
1) The ratio of the speeds of the car and the first space speed: k1 = Vз1 / Va = 7919.6 / 22.22 (2) = 356.382 p ≈ 356 r.
2) The ratio of the speeds of the aircraft and the first space: k2 = Vs1 / Vs = 7919.6 / 250 = 31.6784 p ≈ 32 r.
Answer: The first space speed of the Earth is 356 times greater than the speed of a car, and that of an airplane – 32 times.
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