Jupiter's magnetic field is the result of ________.
A. huge storms in its upper atmosphere generating lightning
B. an aurora in its upper atmosphere
C. the alternating wind directions in its atmosphere
D. its rapid rotation and convective interior
E. the large amount of iron present in its interior
Answer: D
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Suppose Joe is at rest and Moe is moving at almost the speed of light. Due to length contraction, Joe sees Moe's starship as only five inches long. What does Moe notice about his own starship?
A. It is longer and more massive B. It is shorter but no fatter C. It is both shorter and fatter D. It appears to be normal to him
Of the following distances, which is the closest an object can be to a lens of focal length f and still give a real image?
A. 3f B. 2f C. 1.2f D. 0.8f E. 0.49f
A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal. (a) Calculate the efficiency each cycle. (b) Calculate the work done each cycle
What will be an ideal response?
General Questions: While flying horizontally in an airplane, you notice that a string dangling from the overhead luggage compartment hangs at rest at 15° away from the vertical toward the front of the plane. Using this observation, you can conclude that the airplane is
A. moving forward. B. moving backward. C. accelerating forward. D. accelerating backward. E. not accelerating because the string is at rest.