Light rays from a distant source __________________, assuming the light does not pass through any cloud-like nebulae
a. are perpendicular b. focus to an image
c. focus to a point d. are parallel
d
RATIONALE: Nothing is mentioned about passing through a lens or bouncing off a mirror.
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A sample of 
has a mass of 50.0 grams. What is number of molecules of carbon dioxide in the 50.0 gram sample? (C = 12.0u, O = 16.0u)
A. 
B. 
C. 
D. 
E. 
Signs of cratering dominate the surface of Venus
a. True b. False Indicate whether the statement is true or false
A child on a sled starts from rest at the top of a 15° slope. If the trip to the bottom takes how long is the slope? Assume that frictional forces may be neglected
A) 293 m B) 586 m C) 1130 m D) 147 m
An electron is accelerated from rest through a potential difference. After acceleration the electron has a wavelength of 880 nm
What is the potential difference responsible for the acceleration of the electron? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, e = 1.6 10-19 C) A) 1.9 × 10-6 V B) 1.7 × 10-6 V C) 2.2 × 10-6 V D) 2.5 × 10-6 V