A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the magnitude of the minimum force, applied 0.30 m on the other side of the pivot, that is needed to make the child lift off the ground?
A) 66 N B) 23 N C) 75 N D) 740 N E) 44 N
D
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In a Young's double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the separation between slits is tripled?
a. 1/9 c. 3 b. 1 d. 1/3
Gravitational Potential Energy: How high a hill would a 75-kg hiker have to climb to increase her gravitational potential energy by 10,000 J?
Fill in the blank(s) with the appropriate word(s).
A 40.0 liter gas tank is filled to the brim with gasoline when the temperature is 5.00
Gasoline has a coefficient of volume expansion of 
If the gas tank is moved into the sun of a hot summer day, the temperature of the gas tank is increased to 60.0 
What is the volume of gasoline that overflows the tank (ignore the expansion of the gas tank)?
A. 3.95 liters B. 3.11 liters C. 2.67 liters D. 2.09 liters E. 1.55 liters
What do astronomers typically refer to as "heavy elements"?
A) elements that are heavier than iron B) elements that are heavier than carbon C) elements that are heavier than uranium D) elements besides hydrogen and helium