A photoautotroph gets its energy from
A) the Sun and its carbon from other organisms
B) chemical reactions and its carbon from other organisms
C) chemical reactions and its carbon from its environment
D) the Sun and its carbon from the its environment
D
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Noting the main sequence turnoff mass in a star cluster allows you to determine its
A) radial velocity. B) number of stars. C) distance. D) total mass. E) age.
During which phase of the moon do you expect to observe a solar eclipse?
A. first quarter B. new moon C. full moon D. third quarter E. Solar eclipses can occur at any phase of the moon.
A refrigerator condenser is a heat exchanger that converts a refrigerant from a vapor to a liquid at constant pressure and approximately constant temperature. If ammonia is used as a refrigerant and 10 kg/s is condensed at 25ºC when the surrounding temperature is 20ºC, determine the heat transfer from the refrigerant using data from the Appendix Chart C-7.
What will be an ideal response?
A wave is represented by the equation y(x, t) = 3.2 cm sin(1000 rad/s t - 50
x). Another wave is represented by the equation y(x, t) = 4.2 cm sin(1000 rad/s t - 50
x). If the two waves interfere destructively, then what is equation that represents the coherent superposition of the two waves?
A. y(x, t) = 7.4 cm sin(1000 rad/s t + 50.0
x)
B. y(x, t) = 1.0 cm sin(1000 rad/s t - 50.0
x)
C. y(x, t) = 1.0 cm sin(1000 rad/s t + 50.0x)
D. y(x, t) = 7.4 cm sin(1000 rad/s t - 50.0x)