What organism today is most similar to the first cells on Earth?
a. diatoms
b. protists
c. insects
d. bacteria
e. yeast
d
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Which has a larger volume, a liter of water or a liter of mercury (a liquid metal)?
a. water b. mercury c. none of these
The first scientific attempt to map the Milky Way galaxy
a. showed that the Sun was located in the center of the system of planets making up our galaxy. b. showed that our galaxy is a round ball on which we live. c. showed that our galaxy has 9 stars. d. used globular clusters to determine the location of the center of the Earth. e. was completed by William and Caroline Herschel.
The identical 50-kg masses are held at the corners of an equilateral triangle, 30 cm on each side
If one of the masses is released, what is its initial acceleration, if the only forces acting on it are the gravitational forces due to the other two masses? A) 3.7 × 10-8 m/s2 B) 2.5 × 10-8 m/s2 C) 1.9 × 10-8 m/s2 D) 4.2 × 10-8 m/s2 E) 6.4 × 10-8 m/s2
One mole of the carbon-12 isotope contains 6.022 × 1023 atoms. What volume in m3 would be needed to store one mole of cube-shaped children's blocks 2.00 cm long on each side?
A. 4.8 × 1018 B. 1.2 × 1022 C. 6.0 × 1023 D. 1.2 × 1024 E. 4.8 × 1024