Which of the following statements expresses what we mean by a scientific theory?
A) a simple model that explains a wide variety of phenomena and that has survived repeated tests
B) an explanation for a physical phenomenon, an explanation that hasn't been tested yet
C) an educated guess
A
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What aspect of Mercury's interior structure is used to explain the presence of its magnetic field?
What will be an ideal response?
A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is __________
Fill in the blank(s) with correct word
A line representing a wave front for a wave should be drawn:
a. from the source to the receiver. b. from one crest to the preceding crest. c. along one of the crests of the wave. d. in the direction the wave is moving.
An ideal pulley changes the direction of the tension in a string without changing its magnitude
Indicate whether the statement is true or false