- #1
ProBasket
- 140
- 0
Find the terminal speed of a 750-kg rocket that starts from rest carrying 2600kg of fuel and that expels its exhuast gases at 1.8 k/ma
here's the formula I am using: [tex]v_f = v_i + v_{ex}*ln{\frac{M_i}{M_f}}[/tex]
well since it's at rest, initial velocity is zero. so...
[tex]v_f = 1.8*ln(750/2500)[/tex] which turns out to be 2.2 km/s. but the book says the answer is 2.7km/s
here's the formula I am using: [tex]v_f = v_i + v_{ex}*ln{\frac{M_i}{M_f}}[/tex]
well since it's at rest, initial velocity is zero. so...
[tex]v_f = 1.8*ln(750/2500)[/tex] which turns out to be 2.2 km/s. but the book says the answer is 2.7km/s