A thin rectangular piece of wood floats in water. You slowly pour oil with a density equal to that of the wood on the surface of the water until the height of the oil above the water is twice the height of the piece of wood. Which statement is correct?
a. The wood floats on top of the oil, so it sticks up in the air.
b. The wood does not change its position
c. The wood sinks below the surface of the water.
d. The wood is half in the water and half in the oil.
e. The wood floats in the oil just above the water.
e
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If you wanted to show the distance between Earth and the Moon on the same scale, about how far apart would you need to place the two photos?
A) 10 centimeters (about the width of your hand) B) 1 meter (about the length of your arm) C) 100 meters (about the length of a football field) D) 1 kilometer (a little more than a half mile)
Which of these problems arise partly from coal-fired power plants but not from nuclear power plants?
A) global warming B) acid rain C) Both of the above. D) nuclear weapons proliferation E) All of the above.
An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux ?B through any area completely inside the solenoid, centered on the solenoid axis but at a 45° angle to the axis so that it touches the inside of the solenoid as shown below, is
?
?
A.
.B.
.C.
D.
E.
An object is thrown upwards with a speed of 16 m/s. How long does it take it to reach a height of 7.0 m on the way up?
A) 0.52 s B) 1.2 s C) 2.4 s D) 3.1 s E) 4.2 s