Question

Через сколько секунд после старта ракета приобретет первую космическую скорость, равную 7,9 кмс, если она будет двигаться с ускорением 50 мс2?

Answer 1

V=at
t=v/a
t=7900/50=158 c
t=2 мин 63 с

Answer 2

Calculating Time to Reach First Cosmic Velocity

To calculate the time it takes for the rocket to reach the first cosmic velocity, we can use the following kinematic equation:

v = u + at

Where: - v = final velocity (7.9 km/s) - u = initial velocity (0 km/s, as the rocket starts from rest) - a = acceleration (50 m/s^2) - t = time

We can rearrange the equation to solve for t:

t = (v - u) / a

Substitute the given values: - v = 7.9 km/s - u = 0 km/s - a = 50 m/s^2

Calculating: - t = (7.9 km/s - 0 km/s) / 50 m/s^2

Converting 7.9 km/s to m/s: - 7.9 km/s = 7900 m/s

Now, calculate t: - t = 7900 m/s / 50 m/s^2

t ≈ 158 seconds

So, the rocket will acquire the first cosmic velocity, which is 7.9 km/s, approximately 158 seconds after the start.