A copper plate has a hole with a diameter of 2.50 cm. A copper shaft with a diameter of 2.501 cm is to be inserted into the hole. If the linear coefficient of thermal expansion for copper is 
then what is the decrease in temperature the copper shaft has to be subjected to in order to allow the shaft to just fit inside the hole?
A. 23.5
B. 26.4
C. 30.1
D. 33.3
E. 39.5
A. 23.5
Physics & Space Science
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A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2 b. 1/4 c. ?2 d. 4 e. ?1/4
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A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion
A) is zero. B) moves horizontally. C) moves vertically. D) moves along a parabolic path.
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