Galileo's use of inclined planes allowed him to effectively
A) slow down the ball's changes in speed.
B) reduce the time of the ball's changes in speed.
C) eliminate all changes in speed.
D) eliminate friction.
Answer: A
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What happens to the visible light radiated by stars located within a dusty gas cloud?
A) It is blocked by dust and its energy is thereby lost. B) It is absorbed by dust, which heats the dust grains so that they emit the absorbed energy as infrared light. C) It is reflected by dust back to the star from whence it came. D) It passes through the cloud unaffected.
Galileo believed the natural laws were best understood by _____.
A. logic B. experiment C. inertia D. forces
Multiplying a 2-significant-figure number by a 4-significant-figure number and then dividing the product by a seven-significant-figure number yields a number with how many significant figures?
a. 6/7 b. 1 c. 2 d. 13 e. 8/7
Which of the following is about as cheap as coal for base-load electric power today?
A) photovoltaic cells B) solar-thermal generation of electricity C) wind turbines D) All of the above. E) None of the above.