An effective theory must:
A) have been proven.
B) must have been around for centuries or longer.
C) be continuously tested.
D) include mathematical formulae.
C
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Which of these observations of Galileo refuted Ptolemy's epicycles?
A) the complete cycle of Venus' phases B) the rotation of sunspots across the Sun's surface C) the revolution of Jupiter's moons around it D) the craters on the Moon E) the visibility of many more stars with the telescope
What is the result of 1.58 ÷ 3.793?
A) 4.1656 × 10-1 B) 4.166 × 10-1 C) 4.17 × 10-1 D) 4.2 × 10-1 E) 4 × 10-1
Which planet could an astronaut visit without the need for a spacesuit (and survive)?
A) the Moon B) Mars C) Mercury D) Venus E) None; an astronaut would need a spacesuit to survive a visit to any other planet in the solar system.
Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity?
A) The average speed can be less than, greater than or equal to the magnitude of the average velocity. B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity. C) The average speed is always less than or equal to the magnitude of the average velocity. D) The instantaneous speed is always greater than or equal to the magnitude of the instantaneous velocity. E) The average speed is always one-half the magnitude of the average velocity.