A sample of water has a mass of 10.0 grams. What is the number of molecules of water in the 10.0 gram sample (H = 1u, O = 16u)?
a. 
b. 
c. 
d. 
e. 
d.
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A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?
A. 8.1 N down the incline B. 3.0 N down the incline C. 2.1 N up the incline D. 3.0 N up the incline E. 8.1 N up the incline
78°F is how many degrees Celsius?
a. 26 b. 172 c. 34 d. 18 e. 51
Saturn orbits the Sun and follows which laws? Choose the best answer. I. Kepler's first II. Kepler's second III. Kepler's third IV. Newton's law of gravitation
a. I and II b. I, II, and III c. I, III, and IV d. I, II, III, and IV
What is the basic purpose of having leap years?
A) to keep the equinoxes and solstices occurring around the same calendar dates each year B) to keep lunar calendars roughly synchronized with solar calendars C) to make sure that the average length of a solar day remains about 24 hours D) to ensure that there are always 12 months in a year