According to Aristotelian physics, what outside influence acts on a stone while it falls?
A) None.
B) Fire.
C) The Olympic gods.
D) Acceleration.
E) Gravity.
A
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Spherical Mirrors: A convex mirror has a focal length of magnitude f. An object is placed in front of this mirror at a point 
f from the face of the mirror. The image will appear
A. behind the mirror. B. upright and reduced. C. upright and enlarged. D. inverted and reduced. E. inverted and enlarged.
Which asteroid did Dawn visit first and which is second in its planned mission?
A) Mathilde, Eros B) Ida, Dactyl C) Vesta, Ceres D) Gaspra, Ida E) Pallas, Ceres
What is the troposphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere that absorbs X-rays E) the highest layer in the atmosphere
A 0.0040-kg lead bullet is traveling at a speed of 220 m/s when it embeds in a block of ice at 0°C. If all the heat generated goes into melting ice, what quantity of ice is melted? (Lf = 80 kcal/kg, the specific heat of lead = 0.03 kcal/kg/°C, and 1 kcal = 4 186 J)
a. 1.6E–2 kg b. 5.8E–4 kg c. 4.6E–3 kg d. 2.9E–4 kg e. 1.9E–5 kg