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A small 8.00-kg rocket burns fuel that exerts a time-
Chapter 7, Problem 15E(choose chapter or problem)
A small 8.00-kg rocket burns fuel that exerts a time- varying upward force on the rocket (assume constant mass) as the rocket moves upward from the launch pad. This force obeys the equation \(F = A + Bt^2\). Measurements show that at t = 0, the force is 100.0 N, and at the end of the first 2.00 s, it is 150.0 N. (a) Find the constants A and B, including their SI units. (b) Find the net force on this rocket and its acceleration (i) the instant after the fuel ignites and (ii) 3.00 s after the fuel ignites. (c) Suppose that you were using this rocket in outer space, far from all gravity. What would its acceleration be 3.00 s after fuel ignition?
Questions & Answers
QUESTION:
A small 8.00-kg rocket burns fuel that exerts a time- varying upward force on the rocket (assume constant mass) as the rocket moves upward from the launch pad. This force obeys the equation \(F = A + Bt^2\). Measurements show that at t = 0, the force is 100.0 N, and at the end of the first 2.00 s, it is 150.0 N. (a) Find the constants A and B, including their SI units. (b) Find the net force on this rocket and its acceleration (i) the instant after the fuel ignites and (ii) 3.00 s after the fuel ignites. (c) Suppose that you were using this rocket in outer space, far from all gravity. What would its acceleration be 3.00 s after fuel ignition?
ANSWER:
Step 1 of 4
(a) Find the constants A and B, including their SI units.
F = A+B
By substituting t= 0 and F=100 N in the given equation,
100 N= A+B(0)
A= 100 N
By substituting A= 100 N, t= 2s and F= 150 N
150 N= 100N+B(2 s)
B= 12.5 N.
Using above results given equation becomes,
F= 100+ 12.5…………..1