The Earth's rotation axis is tilted from the orbital axis by how much?
What will be an ideal response?
23.5 degrees
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Molecular clouds appear more transparent at longer wavelengths
Indicate whether the statement is true or false
Explain the slope of your graph
Two nuclei may have equal Z, but different A, because they contain
a. equal numbers of protons and neutrons. b. equal numbers of protons but different numbers of neutrons. c. different numbers of protons but equal numbers of neutrons. d. different numbers of protons and neutrons. e. electrons as well as neutrons.
A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. (? = 5.67 × 10-8 W/m2 ? K4 ) A) 360 W B) 760 W C) 790 W D) 850 W E) 880 W