A satellite in an elliptical orbit travels at a
1) constant speed
2) variable speed
3) not enough information to say
because
4) the net force acting on it is zero.
5) of the component of gravitational force existing in its direction of motion.
6) it is characteristic of it to do so.
7) again, not enough information is given to say.
Answer: 2, 5
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In the straight-ahead direction (? = 0°) in Fraunhofer diffraction, which of the following is observed on the screen?
a. a minimum equal in width to the adjacent minima b. a minimum double in width to the adjacent minima c. a maximum equal in width to the adjacent maxima d. a maximum double in width to the adjacent maxima
Is it possible for an object to have a velocity of zero and a numerical value for acceleration? Justify your answer with an example
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a. helium b. nitrogen c. carbon d. all of the other choices