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
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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
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
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.
Why is visible light a bad choice for studying the core of the Galaxy? What is better?
What will be an ideal response?