The Greek model of the atom should be classified as
A) a useful theory.
B) a useless falsehood.
C) an experimental fact.
D) a tentative hypothesis.
E) an observation.
A
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Most of the liquid hydrocarbons on Titan are concentrated in
A) lakes B) surface oceans C) subsurface oceans D) ponds
A block attached to an ideal spring of force constant (spring constant) 15 N/m executes simple harmonic motion on a frictionless horizontal surface
At time t = 0 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2 . The mass of the block is closest to A) 2.3 kg B) 2.6 kg C) 4.7 kg D) 9.4 kg
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, this second lens having a focal length of 8.0 cm. The final image
A) is virtual and upright. B) is real and upright. C) is virtual and inverted. D) is real and inverted. E) cannot be determined with the information given.
A bobsled makes a run down an ice track starting at 66 m vertical distance up the hill. If there is no friction, what is the velocity at the bottom of the hill?
a. 27 m/s c. 44 m/s b. 36 m/s d. 54 m/s