Which of the following statements about scientific theories is false?
A) Theories are not taken seriously if they contradict older, more developed, theories.
B) A theory is a model designed to explain a number of observed facts.
C) If even a single new fact is discovered that contradicts what we expect according to a particular theory, then the theory must be revised or discarded.
D) A theory must make predictions that can be checked by observation or experiment.
E) A theory can never be proved beyond all doubt; we can only hope to collect more and more evidence that might support it.
A
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Which of the following is a contribution that Galileo made to astronomy?
A. He discovered four moons (or satellites) of Jupiter. B. He discovered epicycles. C. He determined the size of Earth. D. He developed the first successful heliocentric theory.
What is the closest thing to a binary planet we find in the solar system? Why?
What will be an ideal response?
The gravitational field at a satellite that is orbiting about the earth at an altitude of 5,000 km is (G =
the mass of the earth is 
A. 9.55 N/kg. B. 8.43 N/kg. C. 3.08 N/kg. D. 6.33 N/kg. E. 5.28 N/kg.
High temperatures are required to get H nuclei to fuse because they ________ one another because of their ________ electric charges
a. attract; negative b. attract; positive c. repel; negative d. repel; positive