Stromatolites are rock-like columns composed of layers of fossilized ____
a. bones and tissue
b. fungi and planets
c. extremophile protists
d. photosynthetic algae
e. single-celled organisms
e
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What do we mean by hyperspace?
A) It is any space with more than three dimensions. B) It is another word for spacetime. C) It is a space through which it is possible to travel fast. D) It is a space with a hyperbolic geometry.
The sunspot cycle averages about 11 months
Indicate whether the statement is true or false
The angular velocity of a 755-g wheel 15.0 cm in diameter is given by the equation ?(t) = (2.00 rad/s2 )t + (1.00 rad/s4 )t3
(a) Through how many radians does the wheel turn during the first 2.00 s of its motion? (b) What is the angular acceleration (in rad/s2 ) of the wheel at the end of the first 2.00 s of its motion?
The efficiency of a Carnot engine operating between 100°C and 0°C is most nearly:
a. 7%. c. 27%. b. 15%. d. 51%.