Stromatolites are
A) fossils of the first organisms to introduce oxygen into the atmosphere
B) fossils of the first multicellular organisms
C) layers of sediment that once contained colonies of ancient microbes
D) fossils of the first eukaryotes
C
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The Moon is accelerated toward the earth, so it is gradually getting closer to the earth
A) True B) False C) The moon is not accelerated toward the earth.
A person has a thermal conductivity of 0.18 W/m·K between his inner core and his skin with an effective shell thickness of 1.30 cm between his core and skin. If his inner core is at the normal 98.6°F, and his skin has a surface area of 1.62 m2, what will be his rate of loss of thermal energy due to conduction through his skin if his skin temperature is 28.3°C?
a. 150 W b. 158 W c. 316 W d. 195 W e. 254 W
A Nichrome wire is used as a heating element in a toaster. From the moment the toaster is first turned on to the moment the wire reaches it maximum temperature, the current in the wire drops by 20% from its initial value
What is the temperature change in the wire? The temperature coefficient for Nichrome is ? = 0.0004 (°C)-1. A) 200°C B) 400°C C) 500°C D) 100°C E) 300°C
Series/Parallel Circuits: Identical light bulbs can be attached to identical ideal batteries in three different ways (A, B, or C), as shown in the figure. The ranking (from lowest to highest) of the total power produced by the battery is
A. B, A, C B. A, B, C C. C, B, A D. A, C, B E. C, A, B