A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10^-6 (°C)-1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150° F?
a. 10
b. 2.5
c. 7.5
d. 5.0
e. 9.5
D
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On a Hertzsprung-Russell diagram, where would you find red giant stars?
A) upper right B) lower right C) upper left D) lower left
All insects are harmful to their ecosystems
What will be an ideal response?
A transverse periodic wave is represented by the equation y(z, t) = 2.0 cm sin(1,200 rad/s t - 20.0
z). Another transverse wave is represented by the equation y(z, t) = 2.0 cm sin(1,200 rad/s t - 20.0
z). What is the equation that represents the superposition of the two waves?
A. y(z, t) = 4.0 cm sin(1,200 rad/s t - 20.0
z)
B. y(x, t) = 4.0 cm sin(1,200 rad/s t) cos20.0x)
C. y(x, t) = +4.0 cm cos(1,200 rad/s) sin(20.0 x)
D. y(x, t) = +4.0 cm cos(1,200 rad/s) + (20.0x)
Gentle tidal interactions are probably necessary to support the formation of _______________ in a galaxy
Fill in the blank(s) with correct word