14C has an activity of 0.25 Bq per gram of carbon for living organisms. The half-life of 14C is 5730 years. If a sample of charcoal from an archeological dig yields a 14C activity of 0.15 Bq per gram of carbon, how old is the material?
a. 
b. 
c. 
d. 
e. 
c.
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There would be only one ocean tide per 24-hour day if the
A) Earth and Moon were equally massive. B) Moon were more massive than Earth. C) Sun's influence on the tides were negligible. D) Moon's mass were small — only a few kilograms. E) none of the above
About how high can water at sea level be theoretically lifted by a vacuum pump?
A) less than 10.3 m B) 10.3 m C) more than 10.3 m
A car with tires whose radius is 35 cm is traveling along a highway at 29.8 m/s. What is the angular speed of the tires?
A) 90 rad/s B) 85 rad/s C) 80 rad/s D) 75 rad/s E) 70 rad/s
When an object 1.15 cm tall is placed 12 cm from a lens, the lens produces an upright image of the object that is 5.75 cm tall. What is the focal length of the lens?
A) 24 cm B) 18 cm C) 60 cm D) 15 cm E) 9.0 cm