A rocket coasts in an elliptical orbit about Earth. To attain escape velocity using the least amount of fuel in a brief firing time, should it fire off at the apogee, or at the perigee? (Hint: Let Fd = ? KE guide your thinking.)
A) perigee, where it is closest and fastest
B) apogee, where it is farthest and slowest
C) same at either location
D) same at any location
Answer: A
You might also like to view...
Since the big bang, but before now, a time existed where matter was not dominant
a. True b. False Indicate whether the statement is true or false
Why is visible light a bad choice for studying the core of the Galaxy? What is better?
What will be an ideal response?
A deuteron is accelerated from rest through a 10-kV potential difference and then moves perpendicularly to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path? (deuteron: m = 3.3 × 10?27 kg, q = 1.6 × 10?19 C)
A. 19 mm B. 13 mm C. 20 mm D. 10 mm E. 9.0 mm
The frequency of an electromagnetic wave and the frequency of the vibrating electrons that produce it are
A) nearly the same. B) the same. C) quite different.