Dmitri places one end of a copper rod in a heat reservoir and the other end in a heat sink. By what factor is the rate of heat flow changed when the temperature difference between the reservoir and sink is doubled?
a. 2.0
c. 4.0
b. 1/2
d. 1/4
A
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Conversion of Units: A typical ruby-throated hummingbird is 8 cm long. Express its length in millimeters and micrometers (µm).
A. 80 mm; 800 µm B. 80 mm; 80,000 µm C. 800 mm; 0.008 µm D. 800 mm; 0.8 µm E. 0.8 mm; 8000 µm
If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because ________
A) the impact caused massive earthquakes worldwide B) radiation from iridium in the asteroid caused the dinosaurs to die of cancer C) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact D) of injuries suffered from direct hits of pieces of the asteroid or comet
Homogeneous mixtures are those mixtures that have variable but ______________ composition
Fill in the blank(s) with correct word
If a refrigerator door is left open while the refrigerator is on, the temperature of a house will ________ (increase, decrease, not change).
Fill in the blank(s) with the appropriate word(s).