Pluto is most similar to:
A) Europa.
B) Miranda.
C) Triton.
D) our Moon.
E) Mercury.
C
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Oort-cloud comets are so far from the Sun that the gravity of neighboring stars can alter their orbits
Indicate whether the statement is true or false
A charged particle moving perpendicular to a magnetic field has a magnet force on it. But when an observer moves with the particle, so that the particle has a relative velocity of zero with respect to the observer, one would expect there would be no magnetic force. Yet there is still a force. If it is not a magnetic force, then what is the source of this force?
a. It is an electrical force. b. It is due to the ether. c. It is a gravitational force. d. It is something other than any of the above.
What, approximately, are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume l = 500 nm light and a pupil diameter D = 0.50 cm. Assume eye fluid has an average n = 1.33
a. 150 m b. 100 m c. 250 m d. 25 m e. 18 m
Two identical lightbulbs are installed in two sockets connected in parallel and power is then applied to the combination so that both bulbs light. If one of the bulbs is then removed from its socket, the other one will
A. get dimmer. B. remain equally bright. C. go out. D. get brighter.